Title: CA $274 Cheap United fights from Washington to Seattle - Expedia.ca ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # CA $274 Cheap United fights from Washington (IAD) to Seattle (SEA) [View CA $274 flight on Sat, Oct 18, 2025](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:IAD,to:SEA,departure:18/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:273.70&airProductToken=AQoyCjAI1YIBEgMzMjYYiBggkgEoo9v6AjCA3voCOEtAAFgBagUyX2Vjb3IIS0FLMkFRRFMSCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) - [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 - ## Plan, book, fly with confidence - ### Be in the know Get alerts if flight prices drop or rise\* - ### Book smarter Save up to 30% on select hotels after you book a flight\* - ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## United flights from Washington to Seattle (IAD→SEA) Prices were available within the past 7 days and start at CA $274 for one-way flights and CA $521 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, Oct 16 - Sun, Oct 19 IAD Washington SEA Seattle CA $521 Roundtrip found 2 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:IAD,to:SEA,departure:16/10/2025TANYT&leg2=from:SEA,to:IAD,departure:19/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:520.60&airProductToken=AQoyCjAI1YIBEgMzMjYYiBggkgEo48T6AjDAx_oCOEtAAFgBagUyX2Vjb3IIS0ZBMkFRRFMKMwoxCNWCARIEMjEzMRiSASCIGCjc5foCMJDo-gI4S0AAWAFqBTJfZWNvcghLRkEyQVFEUxIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAs) Flight from Washington to Seattle (IAD - SEA) route information | Origin airport | Washington Dulles Intl. | | --- | --- | | Destination airport | Seattle - Tacoma Intl. | | Airlines serving | Alaska Airlines, American Airlines, Delta, United | | Popular airline | Alaska Airlines | | Distance | 3679 km | | Average flight time | 2 hours 44 mins | ## Frequently asked questions ### How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)? > Scoring cheap one-way United Airlines flights from IAD to SEA from CA $274 on Expedia is a breeze — just filter by "Price (lowest to highest)." Alternatively, check out our affordable round-trip fares from CA $521 for your next exciting getaway.\**\*These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.* ### What is the cheapest month to fly from IAD to SEA with United Airlines? > Browse for one-way or round-trip flights to Seattle in January or February. You could find a cheap fare with United Airlines during these off-peak times. ### Does United Airlines fly nonstop from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)? > United Airlines operates direct flights from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA), with 7 departures each week. Just apply the "Nonstop" and "Airline" filters while searching on Expedia to find all direct United Airlines flights to SEA. ### How long does it take to fly from IAD to SEA with United Airlines? > It takes around 6h 1m to fly nonstop from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA) with United Airlines. ### What airports does United Airlines fly into in Seattle? > Seattle - Tacoma Intl. Airport (SEA) is the primary Seattle gateway for United Airlines flights from Washington Dulles Intl. Airport (IAD). ### What type of plane does United Airlines fly from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)? > You'll likely be seated on a Boeing 737-900 or a Boeing 737-800 when flying United Airlines from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA). However, keep in mind that a different plane may be assigned due to operational demands. ### Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)? > Changes are generally free within 24 hours of booking, but your airline may charge a fee after that. For further details about altering your flights, go to your "[Trips](https://www.expedia.ca/trips)," select your flight and click on "Manage Booking." If you'd like the flexibility to adjust your plans without extra charges, apply the "No cancel fee" or "Changes included" filter when organizing your trip. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Other ### Lodging - [3 Star Hotels in SeaTac](https://www.expedia.ca/3Star-SeaTac-Hotels.s30-0-d156205.Travel-Guide-Filter-Hotels) - [4 Star Hotels in SeaTac](https://www.expedia.ca/4Star-SeaTac-Hotels.s40-0-d156205.Travel-Guide-Filter-Hotels) - [5 Star Hotels in SeaTac](https://www.expedia.ca/5Star-SeaTac-Hotels.s50-0-d156205.Travel-Guide-Filter-Hotels) - [Downtown Seattle Hotels](https://www.expedia.ca/Downtown-Seattle-Seattle-Hotels.0-n800130-0.Travel-Guide-Filter-Hotels) - [Aparthotels in SeaTac](https://www.expedia.ca/SeaTac-Apart-Hotels.d156205-aaApartHotels.Travel-Guide-Accommodation) - [Apartments in SeaTac](https://www.expedia.ca/SeaTac-Apartments.d156205-aaApartments.Travel-Guide-Accommodation) - [Accor Hotels in SeaTac](https://www.expedia.ca/SeaTac-Hotels-Accor-Hotels.0-0-d156205--bAccorHotels.Travel-Guide-Filter-Hotels) - 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