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

View AU$159 flight on Sat, 27 Sep. 2025Opens 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.

Delta
Thu, 9 Oct. - Tue, 14 Oct.
BWI
Baltimore
SEA
Seattle
AU$305 Return, found 6 days ago
AU$305
Return
found 6 days ago
Select Delta flight, departing Thu, 9 Oct. from Baltimore to Seattle, returning Tue, 14 Oct., priced at AU$305 found 6 days ago
American Airlines
Sat, 27 Sep. - Sat, 4 Oct.
BWI
Baltimore
SEA
Seattle
AU$318 Return, found 3 hours ago
AU$318
Return
found 3 hours ago
Select American Airlines flight, departing Sat, 27 Sep. from Baltimore to Seattle, returning Sat, 4 Oct., priced at AU$318 found 3 hours ago
Alaska Airlines
Sat, 27 Sep. - Sat, 4 Oct.
BWI
Baltimore
SEA
Seattle
AU$372 Return, found 3 hours ago
AU$372
Return
found 3 hours ago
Select Alaska Airlines flight, departing Sat, 27 Sep. from Baltimore to Seattle, returning Sat, 4 Oct., priced at AU$372 found 3 hours ago
Alaska Airlines
Sat, 15 Nov. - Wed, 19 Nov.
BWI
Baltimore
SEA
Seattle
AU$374 Return, found 5 days ago
AU$374
Return
found 5 days ago
Select Alaska Airlines flight, departing Sat, 15 Nov. from Baltimore to Seattle, returning Wed, 19 Nov., priced at AU$374 found 5 days ago
Delta
Sat, 15 Nov. - Wed, 19 Nov.
BWI
Baltimore
SEA
Seattle
AU$375 Return, found 5 days ago
AU$375
Return
found 5 days ago
Select Delta flight, departing Sat, 15 Nov. from Baltimore to Seattle, returning Wed, 19 Nov., priced at AU$375 found 5 days ago
Alaska Airlines
Fri, 26 Sep. - Fri, 3 Oct.
BWI
Baltimore
SEA
Seattle
AU$402 Return, found 1 day ago
AU$402
Return
found 1 day ago
Select Alaska Airlines flight, departing Fri, 26 Sep. from Baltimore to Seattle, returning Fri, 3 Oct., priced at AU$402 found 1 day ago
Alaska Airlines
Sun, 16 Nov. - Wed, 19 Nov.
BWI
Baltimore
SEA
Seattle
AU$404 Return, found 5 days ago
AU$404
Return
found 5 days ago
Select Alaska Airlines flight, departing Sun, 16 Nov. from Baltimore to Seattle, returning Wed, 19 Nov., priced at AU$404 found 5 days ago
American Airlines
Thu, 4 Sep. - Wed, 10 Sep.
BWI
Baltimore
SEA
Seattle
AU$417 Return, found 23 hours ago
AU$417
Return
found 23 hours ago
Select American Airlines flight, departing Thu, 4 Sep. from Baltimore to Seattle, returning Wed, 10 Sep., priced at AU$417 found 23 hours ago
United
Fri, 26 Sep. - Fri, 3 Oct.
BWI
Baltimore
SEA
Seattle
AU$465 Return, found 1 day ago
AU$465
Return
found 1 day ago
Select United flight, departing Fri, 26 Sep. from Baltimore to Seattle, returning Fri, 3 Oct., priced at AU$465 found 1 day ago
Hawaiian Airlines
Wed, 27 Aug. - Tue, 9 Sep.
BWI
Baltimore
SEA
Seattle
AU$565 Return, found 1 day ago
AU$565
Return
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, 27 Aug. from Baltimore to Seattle, returning Tue, 9 Sep., priced at AU$565 found 1 day ago

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

September is typically the cheapest month to fly

From AU$213 - AU$403 per traveller.

Graph displaying average flight prices per month

Flight from Baltimore to Seattle route information
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Return price
AU$305
Distance
3725 km

WAS to SEA Flights

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Our user-friendly tools make it easier than ever to book WAS to SEA flights, even if you’re hoping to hop aboard one of the last-minute flights leaving today. So whether you seek a spontaneous trip to this city’s hottest attractions, or prefer to plan out every detail of your adventure ahead of time, Expedia.com.au is here to help you find exactly what you are interested in.

If you’re on the hunt for cheap flights to Seattle from Maryland, you need not look any further. We make it simple for you to compare different airline carriers or choose the one that appeals to you most. We work with dozens of airlines in order to offer you incredible deals on business and personal travel. Start by searching through our selection of plane tickets today, and you’ll be in the sky before you know it.

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$305. 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.

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