Title: CA $639 Cheap Flights from Seattle (SEA) to Porto (OPO) - Expedia.ca ![](https://images.trvl-media.com/place/603077/e0c840e3-ebbe-4f35-8964-b2f0ca1c1703.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/603077/e0c840e3-ebbe-4f35-8964-b2f0ca1c1703.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # CA $639 Cheap Flights from Seattle (SEA) to Porto (OPO) [View CA $639 flight on Wed, Nov 12, 2025](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:OPO,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:638.50&airProductToken=AQqaAQoxCMKCARIENDM4MhiSASCuHCic8vwCMJT0_AI4T0AAWAFqBU5PQkFHcghPTFg3RzRCVgoxCMKCARIDMjk0GK4cIOuJASiO9fwCMN_4_AI4T0ABWAFqBU5PQkFHcghPTFg3RzRCVgoyCMKCARIEMjY2NhjLsQEg7nMo9Pv8AjCF_fwCOE9AAVgBagVOT0JBR3IIT0xYN0c0QlYSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Seattle-Tacoma International Airport (SEA) to Porto Airport (OPO) - ![Lufthansa](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LH.svg) Lufthansa [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LH"}}]) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![Iberia](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_IB.svg) Iberia [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"IB"}}]) - ![Turkish Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_TK.svg) Turkish Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"TK"}}]) - ![Swiss International Air Lines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LX.svg) Swiss International Air Lines [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LX"}}]) - ![TAP Portugal](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_TP.svg) TAP Portugal [](https://www.expedia.ca/Flights-Search?leg1=from:sea,to:opo,departure:30/09/2025TANYT&leg2=from:opo,to:sea,departure:07/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"TP"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Cheap flights from Seattle (SEA) to Porto (OPO) Prices were available within the past 7 days and start at CA $639 for one-way flights and CA $801 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Swiss International Air Lines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LX.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $801 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:800.74&airProductToken=AQqgAQo0CMywARIEMzMwMxiSASCycSjJpvwCMM6n_AI4TEAAWAFqCEVDT0xJR0hUcghMTFg3NkxHVAoyCMywARICMzkYsnEguTworaj8AjDGrfwCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKNAjMsAESBDIwNjQYuTwg7nMooK78AjC7r_wCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKoAEKNAjMsAESBDIwNjcY7nMguTwo-u_8AjCL8fwCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKMgjMsAESAjM4GLk8ILJxKJ_7_AIw_oD9AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCjQIzLABEgQzMzQ3GLJxIJIBKIyD_QIwk4T9AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUEgoIARABGAEqAkxYGAEiBAgBEAEoAigDKAQwCw) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $805 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:804.04&airProductToken=AQprCjMIzJABEgM0ODkYkgEgjBUorqb8AjCGq_wCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKNAjMkAESBDE3ODIYjBUg7nMozKv8AjD7rPwCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKoAEKNAjMsAESBDIwNjcY7nMguTwo-u_8AjCL8fwCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKMgjMsAESAjM4GLk8ILJxKJ_7_AIw_oD9AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCjQIzLABEgQzMzQ3GLJxIJIBKIyD_QIwk4T9AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUEgoIARABGAEqAkxIGAEiBAgBEAEoAigDKAQwCw) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $810 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:809.84&airProductToken=AQqhAQo0CMyQARIENzUwNxiSASCuHCjEovwCML2k_AI4TEAAWAFqCEVDT0xJR0hUcghMTFg3NkxHVAozCMyQARIDNDMxGK4cIKUEKPyl_AIw4an8AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCjQIzJABEgQxMTc2GKUEIO5zKPeq_AIwnKz8AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCqABCjQIzLABEgQyMDY3GO5zILk8KPrv_AIwi_H8AjhMQABYAWoIRUNPTElHSFRyCExMWDc2TEdUCjIIzLABEgIzOBi5PCCycSif-_wCMP6A_QI4TEABWAFqCEVDT0xJR0hUcghMTFg3NkxHVAo0CMywARIEMzM0NxiycSCSASiMg_0CMJOE_QI4TEABWAFqCEVDT0xJR0hUcghMTFg3NkxHVBIKCAEQARgBKgJMSBgBIgQIARABKAIoAygEMAs) ![Swiss International Air Lines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LX.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $841 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:840.74&airProductToken=AQqgAQo0CMywARIEMzMwMhiSASCycSiQpvwCMJan_AI4TEAAWAFqCEVDT0xJR0hUcghMTFg3NkxHVAoyCMywARICMzkYsnEguTworaj8AjDGrfwCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKNAjMsAESBDIwNjQYuTwg7nMooK78AjC7r_wCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKoAEKNAjMkAESBDE3ODMY7nMgjBUo2fD8AjCD8vwCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKMwjMkAESAzEyMxiMFSClBCjQ8_wCMIz0_AI4TEABWAFqCEVDT0xJR0hUcghMTFg3NkxHVAozCMyQARIDNDkwGKUEIJIBKPD5_AIw-v78AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUEgoIARABGAEqAkxYGAEiBAgBEAEoAigDKAQwCw) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $845 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:844.04&airProductToken=AQprCjMIzJABEgM0ODkYkgEgjBUorqb8AjCGq_wCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKNAjMkAESBDE3ODIYjBUg7nMozKv8AjD7rPwCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKoAEKNAjMkAESBDE3ODMY7nMgjBUo2fD8AjCD8vwCOExAAFgBaghFQ09MSUdIVHIITExYNzZMR1QKMwjMkAESAzEyMxiMFSClBCjQ8_wCMIz0_AI4TEABWAFqCEVDT0xJR0hUcghMTFg3NkxHVAozCMyQARIDNDkwGKUEIJIBKPD5_AIw-v78AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUEgoIARABGAEqAkxIGAEiBAgBEAEoAigDKAQwCw) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $848 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:847.90&airProductToken=AQqdAQoyCMKCARIENTU4OBiSASCjsQEo1qT8AjDLpvwCOFFAAFgBagVOT0JBR3IIUUxYN1QxQlYKMwjCggESBDE1MzEYo7EBIOuJASiSp_wCMLir_AI4UUABWAFqBU5PQkFHcghRTFg3VDFCVgoyCMKCARIEMjY2NhjLsQEg7nMolK38AjClrvwCOFFAAVgBagVOT0JBR3IIUUxYN1QxQlYKmQEKMQjCggESBDcxMTMY7nMgjBgolO78AjDk7vwCOE9AAFgBagVOT0JBR3IIT0xYN0cxQlYKMQjCggESBDQyNzEYjBggrhwom-_8AjDu8_wCOE9AAVgBagVOT0JBR3IIT0xYN0cxQlYKMQjCggESBDU3NjcYrhwgkgEo1vb8AjD2-PwCOE9AAVgBagVOT0JBR3IIT0xYN0cxQlYSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, Nov 5 - Wed, Nov 12 SEA Seattle OPO Porto CA $850 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:05/11/2025TANYT&leg2=from:OPO,to:SEA,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:849.84&airProductToken=AQqhAQo0CMyQARIENzUwNxiSASCuHCjEovwCML2k_AI4TEAAWAFqCEVDT0xJR0hUcghMTFg3NkxHVAozCMyQARIDNDMxGK4cIKUEKPyl_AIw4an8AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCjQIzJABEgQxMTc2GKUEIO5zKPeq_AIwnKz8AjhMQAFYAWoIRUNPTElHSFRyCExMWDc2TEdUCqABCjQIzJABEgQxNzgzGO5zIIwVKNnw_AIwg_L8AjhMQABYAWoIRUNPTElHSFRyCExMWDc2TEdUCjMIzJABEgMxMjMYjBUgpQQo0PP8AjCM9PwCOExAAVgBaghFQ09MSUdIVHIITExYNzZMR1QKMwjMkAESAzQ5MBilBCCSASjw-fwCMPr-_AI4TEABWAFqCEVDT0xJR0hUcghMTFg3NkxHVBIKCAEQARgBKgJMSBgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Tue, Sep 23 - Tue, Sep 30 SEA Seattle OPO Porto CA $886 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:23/09/2025TANYT&leg2=from:OPO,to:SEA,departure:30/09/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:885.42&airProductToken=AQpsCjQI1YIBEgMzNDEYkgEgxI0BKPLF-AIwrsj4AjhMQABYAWoIRUNPQkFTSUNyCExLWDc2TEdUCjQI1YIBEgMxNDQYxI0BIO5zKJPP-AIwrdL4AjhMQAFYAWoIRUNPQkFTSUNyCExLWDc2TEdUCmwKNAjVggESBDkwMDQY7nMgpQQo7Ij5AjCRivkCOExAAFgBaghFQ09CQVNJQ3IITEtYNzZMR1QKNAjVggESBDg3MTcYpQQgkgEozYr5AjCvj_kCOExAAVgBaghFQ09CQVNJQ3IITEtYNzZMR1QSCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Tue, Sep 23 - Fri, Oct 3 SEA Seattle OPO Porto CA $929 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:23/09/2025TANYT&leg2=from:OPO,to:SEA,departure:03/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:928.60&airProductToken=AQpECiAIxJgBEgQ4NDAyGJIBIOIwKK7B-AIw7cX4AjhFQABYAQogCMSYARIEODI1OBjiMCDucyjayPgCMObJ-AI4RUABWAEKQgogCMSYARIEODI1ORjucyDiMCiUrPkCMJut-QI4RUAAWAEKHgjEmAESAjgxGOIwIJIBKOiu-QIw6LP5AjhFQAFYARIKCAEQARgBKgJETBgBIgQIARABKAQwAQ) ![KLM](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/KL.gif) Tue, Sep 23 - Tue, Sep 30 SEA Seattle OPO Porto CA $947 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:OPO,departure:23/09/2025TANYT&leg2=from:OPO,to:SEA,departure:30/09/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:946.42&airProductToken=AQpmCjEIy5gBEgQyMDAxGJIBIOIwKK7B-AIw7cX4AjhWQABYAWoFTElHSFRyCFZLWDc2U0JBCjEIy5gBEgQyMjgyGOIwIO5zKNrI-AIw5sn4AjhMQAFYAWoFTElHSFRyCFZLWDc2U0JBCmYKMQjLmAESBDIyODQY7nMg4jAo2I35AjDajvkCOExAAFgBagVMSUdIVHIIVktYNzZTQkEKMQjLmAESBDYxMjIY4jAgkgEoqJj5AjConfkCOFZAAVgBagVMSUdIVHIIVktYNzZTQkESCggBEAEYASoCS0wYASIECAEQASgCKAMoBDAN) ## Find the cheapest month to fly from Seattle (SEA) to Porto (OPO) ### January is typically the cheapest month to fly From CA $791 - CA $1,704 per traveller. ## Frequently asked questions ### How much is a flight from Sea-Tac Airport to Dr. Francisco de Sa Carneiro Airport (OPO)? > The lowest price advertised for a round-trip flight from Seattle - Tacoma Intl. Airport (SEA) to Porto Airport is CA $801. But you better act fast. This price is based on fares quoted within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Sea-Tac Airport to Porto Airport? > Every air carrier has its own set of terms and conditions. If you do decide to cancel, follow the instructions on our [Customer Service Portal](https://www.expedia.ca/helpcenter). ### How do I find cheap flights from Sea-Tac Airport to Porto Airport that have flexible change policies? > Plenty of airlines offer the option to move your flight without charging a fee. All you pay is the cost difference between the two flights. When searching for Sea-Tac Airport to Porto Airport flights, you'll see a "No change fees" box for you to tick. ### How many hours is the flight from Seattle - Tacoma Intl. Airport (SEA) to OPO? > Make the 13 hours and 20 minutes between Sea-Tac Airport and Porto Airport as comfortable as possible. Pack the essentials, like a water bottle, toothbrush and toiletries, and sit back and enjoy the flight! ### How far is the flight from Sea-Tac Airport to Porto Airport? > With a flight distance of 8,200 kilometres from Sea-Tac Airport (SEA) to Porto Airport (OPO), this is a long trip. Be sure to drink lots of water and take a short walk down the aisle every so often. ### Which airlines fly direct from Sea-Tac Airport to Porto Airport? > At present, no airlines offer direct flights from Sea-Tac Airport to Dr. Francisco de Sa Carneiro Airport (OPO). You'll need to book a flight with one or more stops. To get the best price and connections, lock in your airfare ahead of time. ### Are Sea-Tac Airport to Porto Airport flight tickets cheaper when they're purchased at the last minute? > It is possible to score a fantastic last-minute deal from Seattle - Tacoma Intl. Airport (SEA) to Dr. Francisco de Sa Carneiro Airport (OPO), but it's also possible to miss out altogether! As many airlines release prices up to 12 months in advance, it's worth keeping an eye on fares early and being ready to pounce when you spot a good bargain. Expedia compares air carrier prices and updates flight deals frequently, so you can rest assured you're always seeing the latest offers. ## Travel information | Origin airport | Seattle - Tacoma Intl. | | --- | --- | | Destination airport | Dr. Francisco de Sa Carneiro | | Airlines serving | Air Canada, Air Europa, American Airlines, British Airways, Brussels Airlines, Delta, Iberia, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines | | Roundtrip price | CA $801 | | Distance | 8140 km | ## Book with confidence ### Seattle to Porto Flights **The easy way to book your flights from Seattle to Porto**  With Expedia, it’s simple to find and book flights to Porto from Seattle whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Dr. Francisco de Sa Carneiro, too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Seattle to Porto today, tomorrow, or this week.   **Save dollars with cheap flights from Seattle - Tacoma Intl., SEA to Dr. Francisco de Sa Carneiro, OPO**  Sort your search results by price to find great deals on your flight from Seattle to Porto—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Porto from Seattle currently is just CA $801 rising to CA $947.   Here are more money-saving tips:  - Fly in November when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Porto   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to Porto from Seattle**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Porto with Expedia today. ## Explore a world of travel with Expedia - Trending Routes - Trending Flights - Top Flights Destinations - Other Airlines - Cheap Flights from Other Airports - Expedia's Latest Trends ### Top Routes from Seattle - [Seattle to Mumbai (SEA - BOM)](https://expedia.ca/lp/flights/sea/bom/seattle-to-mumbai) - [Seattle to Newark Liberty Intl. Airport (SEA - EWR)](https://expedia.ca/lp/flights/sea/ewr/seattle-to-newark-liberty-intl-airport) - [Seattle to Phoenix (SEA - PHX)](https://expedia.ca/lp/flights/sea/phx/seattle-to-phoenix) - [Seattle to Los Angeles (SEA - LAX)](https://expedia.ca/lp/flights/sea/lax/seattle-to-los-angeles) - [Seattle to Miami (SEA - MIA)](https://expedia.ca/lp/flights/sea/mia/seattle-to-miami) - [Seattle to Fort Lauderdale (SEA - FLL)](https://expedia.ca/lp/flights/sea/fll/seattle-to-fort-lauderdale) - [Seattle to New York (SEA - LGA)](https://expedia.ca/lp/flights/sea/lga/seattle-to-new-york) - [Seattle to Delhi (SEA - DEL)](https://expedia.ca/lp/flights/sea/del/seattle-to-delhi) - [Seattle to New York (SEA - JFK)](https://expedia.ca/lp/flights/sea/jfk/seattle-to-new-york) - [Seattle to Dubai (SEA - DXB)](https://expedia.ca/lp/flights/sea/dxb/seattle-to-dubai) - [Seattle to Tokyo (SEA - NRT)](https://expedia.ca/lp/flights/sea/nrt/seattle-to-tokyo) - [Seattle to Dallas (SEA - DFW)](https://expedia.ca/lp/flights/sea/dfw/seattle-to-dallas) ### Top Routes to Porto - [Ottawa to Porto (YOW - OPO)](https://expedia.ca/lp/flights/yow/opo/ottawa-to-porto) - [Calgary to Porto (YYC - OPO)](https://expedia.ca/lp/flights/yyc/opo/calgary-to-porto) - [Paris to Porto (CDG - OPO)](https://expedia.ca/lp/flights/cdg/opo/paris-to-porto) - [Winnipeg to Porto (YWG - OPO)](https://expedia.ca/lp/flights/ywg/opo/winnipeg-to-porto) - [Halifax to Porto (YHZ - OPO)](https://expedia.ca/lp/flights/yhz/opo/halifax-to-porto) - [Victoria to Porto (YYJ - OPO)](https://expedia.ca/lp/flights/yyj/opo/victoria-to-porto) - [Québec to Porto (YQB - OPO)](https://expedia.ca/lp/flights/yqb/opo/quebec-to-porto) - [Barcelona to Porto (BCN - OPO)](https://expedia.ca/lp/flights/bcn/opo/barcelona-to-porto) - [Montreal to Porto (YUL - OPO)](https://expedia.ca/lp/flights/yul/opo/montreal-to-porto) - [Madrid to Porto (MAD - OPO)](https://expedia.ca/lp/flights/mad/opo/madrid-to-porto) - [Vancouver to Porto (YVR - OPO)](https://expedia.ca/lp/flights/yvr/opo/vancouver-to-porto) - [Prince George to Porto (YXS - OPO)](https://expedia.ca/lp/flights/yxs/opo/prince-george-to-porto) ### Top Routes from Seattle - [Alaska Airlines Seattle to Los Angeles](https://expedia.ca/lp/flight-routes/alaska-airlines-from-seattle-tacoma-intl-to-los-angeles-intl/as/sea/lax) - [Alaska Airlines Seattle to Fort Lauderdale](https://expedia.ca/lp/flight-routes/alaska-airlines-from-seattle-tacoma-intl-to-fort-lauderdale-hollywood-intl/as/sea/fll) - [Lufthansa Seattle to Delhi](https://expedia.ca/lp/flight-routes/lufthansa-from-seattle-tacoma-intl-to-indira-gandhi-intl/lh/sea/del) - [Alaska Airlines Seattle to New York](https://expedia.ca/lp/flight-routes/alaska-airlines-from-seattle-tacoma-intl-to-john-f-kennedy-intl/as/sea/jfk) - [Air Canada Seattle to Tokyo](https://expedia.ca/lp/flight-routes/air-canada-from-seattle-tacoma-intl-to-narita-intl/ac/sea/nrt) - [Alaska Airlines Seattle to Dallas](https://expedia.ca/lp/flight-routes/alaska-airlines-from-seattle-tacoma-intl-to-dallas-fort-worth-intl/as/sea/dfw) - [Alaska Airlines Seattle to Orlando](https://expedia.ca/lp/flight-routes/alaska-airlines-from-seattle-tacoma-intl-to-orlando-intl/as/sea/mco) ### Top Flight Destinations - [Flights to Lisbon District](https://expedia.ca/Cheap-Flights-To-Lisbon-District.d178278.Travel-Guide-Flights) - [Flights to Porto](https://expedia.ca/Cheap-Flights-To-Porto.d603077.Travel-Guide-Flights) - [Flights to Albufeira](https://expedia.ca/Cheap-Flights-To-Albufeira.d4692.Travel-Guide-Flights) - [Flights to Lagos](https://expedia.ca/Cheap-Flights-To-Lagos.d5292.Travel-Guide-Flights) - [Flights to Funchal](https://expedia.ca/Cheap-Flights-To-Funchal.d1232.Travel-Guide-Flights) - [Flights to Faro](https://expedia.ca/Cheap-Flights-To-Faro.d1193.Travel-Guide-Flights) - [Flights to Portimão](https://expedia.ca/Cheap-Flights-To-Portimao.d9470.Travel-Guide-Flights) - [Flights to Loulé](https://expedia.ca/Cheap-Flights-To-Loule.d182230.Travel-Guide-Flights) - [Flights to Lagoa](https://expedia.ca/Cheap-Flights-To-Lagoa.d5714.Travel-Guide-Flights) - [Flights to Ponta Delgada](https://expedia.ca/Cheap-Flights-To-Ponta-Delgada.d2755.Travel-Guide-Flights) - [Flights to Tavira](https://expedia.ca/Cheap-Flights-To-Tavira.d182254.Travel-Guide-Flights) - [Flights to Olhao](https://expedia.ca/Cheap-Flights-To-Olhao.d182241.Travel-Guide-Flights) - [Flights to Nazaré](https://expedia.ca/Cheap-Flights-To-Nazare.d11098.Travel-Guide-Flights) - [Flights to Mira](https://expedia.ca/Cheap-Flights-To-Mira.d6129161.Travel-Guide-Flights) - [Flights to Aveiro](https://expedia.ca/Cheap-Flights-To-Aveiro.d10662.Travel-Guide-Flights) - [Flights to Coimbra](https://expedia.ca/Cheap-Flights-To-Coimbra.d6568.Travel-Guide-Flights) - [Flights to Braga](https://expedia.ca/Cheap-Flights-To-Braga.d6349.Travel-Guide-Flights) - [Flights to Évora](https://expedia.ca/Cheap-Flights-To-Evora.d4900.Travel-Guide-Flights) - [Flights to Sesimbra](https://expedia.ca/Cheap-Flights-To-Sesimbra.d11340.Travel-Guide-Flights) - [Flights to Vila do Bispo](https://expedia.ca/Cheap-Flights-To-Vila-Do-Bispo.d601695.Travel-Guide-Flights) ### Other Airlines - [Delta](https://expedia.ca/Delta-Flights.cDL.Travel-Guide-Airlines) - [American Airlines](https://expedia.ca/American-Airlines-Flights.cAA.Travel-Guide-Airlines) - [Alaska Airlines](https://expedia.ca/Alaska-Airlines-Flights.cAS.Travel-Guide-Airlines) - [Air Canada](https://expedia.ca/Air-Canada-Flights.cAC.Travel-Guide-Airlines) - [WestJet](https://expedia.ca/WestJet-Flights.cWS.Travel-Guide-Airlines) - [United](https://expedia.ca/United-Flights.cUA.Travel-Guide-Airlines) - [Lufthansa](https://expedia.ca/Lufthansa-Flights.cLH.Travel-Guide-Airlines) - [British Airways](https://expedia.ca/British-Airways-Flights.cBA.Travel-Guide-Airlines) - [Turkish Airlines](https://expedia.ca/Turkish-Airlines-Flights.cTK.Travel-Guide-Airlines) - [Qatar Airways](https://expedia.ca/Qatar-Airways-Flights.cQR.Travel-Guide-Airlines) - [Virgin Atlantic](https://expedia.ca/Virgin-Atlantic-Flights.cVS.Travel-Guide-Airlines) - [Emirates](https://expedia.ca/Emirates-Flights.cEK.Travel-Guide-Airlines) - [Singapore Airlines](https://expedia.ca/Singapore-Airlines-Flights.cSQ.Travel-Guide-Airlines) - [Swiss International Air Lines](https://expedia.ca/Swiss-International-Air-Lines-Flights.cLX.Travel-Guide-Airlines) - [KLM](https://expedia.ca/KLM-Flights.cKL.Travel-Guide-Airlines) - [Air France](https://expedia.ca/Air-France-Flights.cAF.Travel-Guide-Airlines) ### Main Airports for Flights - [Boeing Field Airport (BFI)](https://expedia.ca/lp/airports/bfi/flights-from-boeing-field-airport) - [Seattle Paine Field Intl. Airport Airport (PAE)](https://expedia.ca/lp/airports/pae/flights-from-seattle-paine-field-intl-airport-airport) - [William R. Fairchild Intl. Airport (CLM)](https://expedia.ca/lp/airports/clm/flights-from-william-r-fairchild-intl-airport) - [Friday Harbor Airport (FRD)](https://expedia.ca/lp/airports/frd/flights-from-friday-harbor-airport) - [Friday Harbor Sea Plane Base Airport (FBS)](https://expedia.ca/lp/airports/fbs/flights-from-friday-harbor-sea-plane-base-airport) - [Bowerman Airport (HQM)](https://expedia.ca/lp/airports/hqm/flights-from-bowerman-airport) - [Roche Harbor Airport (RCE)](https://expedia.ca/lp/airports/rce/flights-from-roche-harbor-airport) - [Bellingham Intl. 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Scan the QR code with your device camera and download our app ![QR code to download the app](data:image/png;base64,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)