£73 Cheap Flights from Washington (WAS) to Seattle (SEA)

View £73 flight on Sat, 13 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 and start at £73 for one-way flights and £145 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, 16 Sep - Tue, 23 Sep
BWI
Baltimore
SEA
Seattle
£145 Return, found 3 days ago
£145
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 16 Sep from Baltimore to Seattle, returning Tue, 23 Sep, priced at £145 found 3 days ago
Delta
Tue, 9 Sep - Fri, 12 Sep
BWI
Baltimore
SEA
Seattle
£152 Return, found 2 days ago
£152
Return
found 2 days ago
Select Delta flight, departing Tue, 9 Sep from Baltimore to Seattle, returning Fri, 12 Sep, priced at £152 found 2 days ago
Hawaiian Airlines
Wed, 10 Sep - Tue, 16 Sep
BWI
Baltimore
SEA
Seattle
£168 Return, found 2 days ago
£168
Return
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, 10 Sep from Baltimore to Seattle, returning Tue, 16 Sep, priced at £168 found 2 days ago
Delta
Fri, 12 Sep - Mon, 15 Sep
BWI
Baltimore
SEA
Seattle
£179 Return, found 2 days ago
£179
Return
found 2 days ago
Select Delta flight, departing Fri, 12 Sep from Baltimore to Seattle, returning Mon, 15 Sep, priced at £179 found 2 days ago
Alaska Airlines
Tue, 30 Sep - Tue, 7 Oct
BWI
Baltimore
SEA
Seattle
£189 Return, found 4 days ago
£189
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 30 Sep from Baltimore to Seattle, returning Tue, 7 Oct, priced at £189 found 4 days ago
Alaska Airlines
Tue, 9 Dec - Sat, 13 Dec
DCA
Washington
SEA
Seattle
£205 Return, found 2 days ago
£205
Return
found 2 days ago
Select Alaska Airlines flight, departing Tue, 9 Dec from Washington to Seattle, returning Sat, 13 Dec, priced at £205 found 2 days ago
Alaska Airlines
Sat, 4 Oct - Sat, 11 Oct
IAD
Washington
SEA
Seattle
£205 Return, found 20 hours ago
£205
Return
found 20 hours ago
Select Alaska Airlines flight, departing Sat, 4 Oct from Washington to Seattle, returning Sat, 11 Oct, priced at £205 found 20 hours ago
Hawaiian Airlines
Thu, 11 Dec - Sat, 13 Dec
DCA
Washington
SEA
Seattle
£212 Return, found 2 days ago
£212
Return
found 2 days ago
Select Hawaiian Airlines flight, departing Thu, 11 Dec from Washington to Seattle, returning Sat, 13 Dec, priced at £212 found 2 days ago
American Airlines
Tue, 9 Dec - Sat, 13 Dec
DCA
Washington
SEA
Seattle
£219 Return, found 2 days ago
£219
Return
found 2 days ago
Select American Airlines flight, departing Tue, 9 Dec from Washington to Seattle, returning Sat, 13 Dec, priced at £219 found 2 days ago
JetBlue Airways
Mon, 8 Sep - Wed, 17 Sep
DCA
Washington
SEA
Seattle
£231 Return, found 2 days ago
£231
Return
found 2 days ago
Select JetBlue Airways flight, departing Mon, 8 Sep from Washington to Seattle, returning Wed, 17 Sep, priced at £231 found 2 days ago

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

September is typically the cheapest month to fly

From £102 - £194 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, JetBlue Airways
Return price
£145
Distance
3725 km

Compare flights from Washington to Seattle easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to Seattle. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from WAS-All Airports to Seattle - Tacoma Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from WAS-All Airports (WAS) to Seattle - Tacoma Intl. (SEA)

The easiest way to view the best deals on flights from Washington to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from WAS-All Airports to Seattle - Tacoma Intl. start at just £145 and range up to £231.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and Seattle
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to Seattle flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from WAS-All Airports to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

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 £145. 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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