Cheap Flights from Washington (WAS) to Seattle (SEA)

View AU$138 flight on Wed, 23 Sept 2026Opens in a new window

Popular airlines from Washington to Seattle, WA (SEA-Seattle - Tacoma Intl.)

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Cheap Flights from Washington (WAS) to Seattle (SEA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$289 Return, found 6 days ago
AU$289
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$289 found 6 days ago
Delta
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$303 Return, found 6 days ago
AU$303
Return
found 6 days ago
Select Delta flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$303 found 6 days ago
American Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$346 Return, found 6 days ago
AU$346
Return
found 6 days ago
Select American Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$346 found 6 days ago
Alaska Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$352 Return, found 6 days ago
AU$352
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$352 found 6 days ago
Alaska Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$366 Return, found 6 days ago
AU$366
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$366 found 6 days ago
Delta
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$374 Return, found 6 days ago
AU$374
Return
found 6 days ago
Select Delta flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$374 found 6 days ago
American Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$389 Return, found 6 days ago
AU$389
Return
found 6 days ago
Select American Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$389 found 6 days ago
Alaska Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$394 Return, found 6 days ago
AU$394
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$394 found 6 days ago
Alaska Airlines
Wed, 23 Sept - Tue, 29 Sept
BWI
Baltimore
SEA
Seattle
AU$400 Return, found 6 days ago
AU$400
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 23 Sept from Baltimore to Seattle, returning Tue, 29 Sept, priced at AU$400 found 6 days ago
United
Thu, 14 May - Tue, 26 May
IAD
Washington
SEA
Seattle
AU$701 Return, found 3 days ago
AU$701
Return
found 3 days ago
Select United flight, departing Thu, 14 May from Washington to Seattle, returning Tue, 26 May, priced at AU$701 found 3 days ago

Find the cheapest month to fly from Washington (WAS) to Seattle (SEA)

May is typically the cheapest month to fly

From AU$232 - AU$478 per traveller.

Frequently asked questions

How much is a flight from Washington, DC (WAS-All Airports) to Seattle - Tacoma Intl. Airport (SEA)?
Start packing your bags, because round-trip journeys from Washington, DC (WAS-All Airports) to SEA start from AU$289. That's based on airfares available within the last 7 days on Expedia for flights departing within the next year. Prices can move quickly, so book now to lock in the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Washington, DC (WAS-All Airports) to SEA?
When it comes to cancellation fees, each airline has different terms and conditions. If you decide to cancel your getaway, visit our Customer Service Portal.
How do I find cheap flights from Washington, DC (WAS-All Airports) to SEA that have flexible change policies?
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 Washington, DC (WAS-All Airports) to SEA flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Washington, DC (WAS-All Airports) to SEA?
The flying distance between Washington, DC (WAS-All Airports) (WAS) and Sea-Tac Airport (SEA) is 3 700 kilometres. Listen to your favourite tunes or read a good book and the journey will fly by.
Which airlines fly direct from Washington, DC (WAS-All Airports) to Sea-Tac Airport?
Alaska Airlines (AS) is the number one choice for many travellers. It offers 117 flights between Washington, DC (WAS-All Airports) and Sea-Tac Airport each month. You could also check out the fares available with United Airlines (UA). It operates 60 flights every month between Maryland and SeaTac.
Are Washington, DC (WAS-All Airports) to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Booking your trip from Washington, DC (WAS-All Airports) to Sea-Tac Airport at the last minute could be your ticket to a cheap deal. However, you might miss out on a flight altogether! If you'd rather play it safe, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to 12 months in advance. If your preferred air carrier hasn't released tickets yet, check back frequently as deals are updated all the time on Expedia.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Seattle - Tacoma Intl.
Return price
AU$289
Distance
3725 km
*Available to Expedia members.