Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey from BWI to Sea-Tac Airport was €232. Fares this good don’t stick around for long, so make sure you book yours today. Prices and availability are subject to change. Additional terms apply.

The majority of flights can be conveniently cancelled online, but whether or not you are charged a fee varies between airlines. If you do need to cancel your trip, follow the easy instructions in the Customer Service Portal.

Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you’re searching for BWI Airport to Seattle - Tacoma Intl. Airport (SEA) flights, you’ll see a “no change fees” filter for you to select.

The flight distance between BWI Marshall and Sea-Tac Airport is 3,800 kilometres. Pack yourself a drink, some snacks and a few good podcasts. Keep yourself entertained and the hours will fly by.

Flying straight from BWI Airport to Sea-Tac Airport is a cinch with Alaska Airlines (AS). This top airline operates 30 flights every month.

Booking your trip from BWI to Seattle - Tacoma Intl. Airport (SEA) at the last minute could be your ticket to an awesome deal. However, it might cost you a whole lot more! If you’d prefer to err on the side of caution, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to a year in advance. If your preferred carrier hasn’t released tickets yet, check back regularly as deals are updated on Expedia all the time.