Title: CA $181 Cheap Flights from Harrisburg (MDT) to Seattle (SEA) - Expedia.ca ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # CA $181 Cheap Flights from Harrisburg (MDT) to Seattle (SEA) [View CA $181 flight on Tue, Dec 16, 2025](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:MDT,to:SEA,departure:16/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:180.10&airProductToken=AQpoCjMIwYIBEgQxNzk1GOyYASCjsQEoh-7_AjDt7_8COEJAAFgBagVCQVNJQ3IIT1ZBV1pOQlYKMQjBggESAzcxNxijsQEgkgEow_D_AjDS8v8COEJAAVgBagVCQVNJQ3IIT1ZBV1pOQlYSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAL) - [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 Harrisburg Intl. Airport (MDT) to Seattle-Tacoma International Airport (SEA) - ![Alaska Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:mdt,to:sea,departure:22/11/2025TANYT&leg2=from:sea,to:mdt,departure:29/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:mdt,to:sea,departure:22/11/2025TANYT&leg2=from:sea,to:mdt,departure:29/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:mdt,to:sea,departure:22/11/2025TANYT&leg2=from:sea,to:mdt,departure:29/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:mdt,to:sea,departure:22/11/2025TANYT&leg2=from:sea,to:mdt,departure:29/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![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 Harrisburg (MDT) to Seattle (SEA) Prices were available within the past 7 days and start at CA $181 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ## Find the cheapest month to fly from Harrisburg (MDT) to Seattle (SEA) ### May is typically the cheapest month to fly From CA $362 - CA $869 per traveller. ## Frequently asked questions ### How much is a flight from Harrisburg Intl. Airport to Sea-Tac Airport? > Round-trip journeys from MDT to SEA start from . This figure is based on fares available within the last 7 days on Expedia for flights departing within the next year — book ASAP so you don't miss out. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from MDT to Sea-Tac Airport? > The majority of flights can be conveniently cancelled online, but whether you incur a fee all comes down to your airline. If you do need to cancel your break, follow the easy instructions in the [Customer Service Portal](https://www.expedia.ca/helpcenter). ### How do I find cheap flights from Harrisburg Intl. Airport (MDT) to Seattle - Tacoma Intl. Airport (SEA) that have flexible change policies? > Plenty of carriers offer the option to reschedule your flight without a change fee. All you pay is the difference in the ticket price. When looking for MDT to SEA flights, you'll see a "No change fees" box for you to pick. ### How many hours is the flight from Harrisburg Intl. Airport to Sea-Tac Airport? > The average flight between MDT and Sea-Tac Airport is 7 hours and 36 minutes. If you get peckish on longer flights, pack a few healthy snacks in your carry-on baggage. ### How far is the flight from Harrisburg Intl. Airport to Sea-Tac Airport? > The flight distance between Harrisburg Intl. Airport (MDT) and Seattle - Tacoma Intl. Airport (SEA) is 3,700 kilometres. Bring along a drink, a snack and a few good podcasts. Keep yourself entertained and the time will fly by. ### Which airlines fly direct from MDT to Seattle - Tacoma Intl. Airport (SEA)? > You won't find any airlines flying directly between MDT and Sea-Tac Airport, so be prepared to make at least one stop on your journey. A layover can be a good way to break up a trip! ### Are Harrisburg Intl. Airport to SEA flight tickets cheaper when they're purchased at the last minute? > It is possible to score a fantastic last-minute deal from MDT to Sea-Tac Airport, but it can also be hit-or-miss. As many airlines release seats up to a year in advance, it's worthwhile keeping an eye on fares early and being ready to pounce when you see a bargain. Expedia compares carrier prices and updates flight deals frequently, so you can rest easy knowing you're always seeing the latest offers. ## Travel information | Origin airport | Harrisburg Intl. | | --- | --- | | Destination airport | Seattle - Tacoma Intl. | | Distance | 3664 km | ## Book with confidence ### Middletown to Seattle Flights **The easy way to book your flights from Harrisburg to Seattle**  With Expedia, it’s simple to find and book flights to Seattle from Harrisburg 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 Seattle - Tacoma Intl., 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 Harrisburg to Seattle today, tomorrow, or this week.   **Save dollars with cheap flights from Harrisburg Intl., MDT to Seattle - Tacoma Intl., SEA**  Sort your search results by price to find great deals on your flight from Harrisburg to Seattle—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Seattle from Harrisburg currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Seattle   - 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 Seattle from Harrisburg**  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. 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