Cheap flights from Washington, D.C. to Seattle from $106

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Seattle departing on 12/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. to Seattle

Cheap round-trip flights

Frontier Logo
9:59 pm - 8:39 pmBWI-SEA
25h 40m2 stops
Frontier Logo
6:12 am - 5:42 pmSEA-BWI
8h 30m1 stop
$214Frontier
Find Deal
Fri, Oct 3 - Mon, Oct 6
Frontier Logo
6:29 pm - 12:07 pmBWI-SEA
20h 38m1 stop
Frontier Logo
2:31 pm - 6:29 pmSEA-BWI
24h 58m2 stops
$215Frontier
Find Deal
Fri, Oct 24 - Mon, Oct 27
United Airlines Logo
6:28 pm - 12:59 amBWI-SEA
9h 31m1 stop
United Airlines Logo
9:05 am - 9:27 pmSEA-BWI
9h 22m1 stop
$222United Airlines
Find Deal
Wed, Dec 3 - Thu, Dec 4
United Airlines Logo
10:10 am - 6:00 pmBWI-SEA
10h 50m1 stop
United Airlines Logo
5:00 am - 3:10 pmSEA-BWI
7h 10m1 stop
$227United Airlines
Find Deal
Sat, Nov 8 - Wed, Nov 12
Alaska Airlines Logo
6:25 am - 9:08 amIAD-SEA
5h 43mnonstop
Alaska Airlines Logo
4:20 pm - 12:23 amSEA-IAD
5h 03mnonstop
$243Alaska Airlines
Find Deal
Thu, Oct 9 - Tue, Oct 14
Alaska Airlines Logo
6:25 am - 9:08 amIAD-SEA
5h 43mnonstop
Alaska Airlines Logo
4:20 pm - 12:23 amSEA-IAD
5h 03mnonstop
$245Alaska Airlines
Find Deal
Tue, Oct 7 - Wed, Oct 8
Hawaiian Airlines Logo
6:25 am - 9:08 amIAD-SEA
5h 43mnonstop
Hawaiian Airlines Logo
4:20 pm - 12:23 amSEA-IAD
5h 03mnonstop
$250Hawaiian Airlines
Find Deal
Sat, Oct 11 - Fri, Oct 17
Hawaiian Airlines Logo
6:25 am - 9:08 amIAD-SEA
5h 43mnonstop
Hawaiian Airlines Logo
4:20 pm - 12:23 amSEA-IAD
5h 03mnonstop
$253Hawaiian Airlines
Find Deal
Sat, Oct 11 - Fri, Oct 17
Delta Logo
7:35 am - 10:28 amIAD-SEA
5h 53mnonstop
Delta Logo
4:59 pm - 12:54 amSEA-IAD
4h 55mnonstop
$257Delta
Find Deal
Fri, Nov 7 - Tue, Nov 11
Delta Logo
7:15 am - 2:45 pmBWI-SEA
10h 30m1 stop
Delta Logo
7:12 pm - 5:58 amSEA-BWI
7h 46m1 stop
$263Delta
Find Deal
Mon, Nov 3 - Mon, Nov 10

Hawaiian Airlines flights from Washington, D.C. to Seattle

Our best Hawaiian Airlines deals on Washington, D.C. to Seattle flight tickets
Hawaiian Airlines
Oct 11
IAD6:25 amWashington, D.C. Dulles Intl
5h 43m
SEA9:08 amSeattle/Tacoma Intl
Oct 17
SEA4:20 pmSeattle/Tacoma Intl
5h 03m
IAD12:23 amWashington, D.C. Dulles Intl
Hawaiian Airlines
Oct 11
IAD6:25 amWashington, D.C. Dulles Intl
5h 43m
SEA9:08 amSeattle/Tacoma Intl
Oct 17
SEA4:20 pmSeattle/Tacoma Intl
5h 03m
IAD12:23 amWashington, D.C. Dulles Intl
Hawaiian Airlines
Oct 12
IAD6:25 amWashington, D.C. Dulles Intl
5h 43m
SEA9:08 amSeattle/Tacoma Intl
Oct 18
SEA4:20 pmSeattle/Tacoma Intl
5h 03m
IAD12:23 amWashington, D.C. Dulles Intl

Frontier flights from Washington, D.C. to Seattle

Our best Frontier deals on Washington, D.C. to Seattle flight tickets
Frontier
Oct 3
BWI9:59 pmBaltimore/Washington
25h 40m
2 stops
SEA8:39 pmSeattle/Tacoma Intl
Oct 6
SEA6:12 amSeattle/Tacoma Intl
8h 30m
1 stop
BWI5:42 pmBaltimore/Washington
Frontier
Oct 24
BWI6:29 pmBaltimore/Washington
20h 38m
1 stop
SEA12:07 pmSeattle/Tacoma Intl
Oct 27
SEA2:31 pmSeattle/Tacoma Intl
24h 58m
2 stops
BWI6:29 pmBaltimore/Washington
Frontier
Oct 17
BWI6:17 pmBaltimore/Washington
20h 50m
1 stop
SEA12:07 pmSeattle/Tacoma Intl
Oct 19
SEA8:43 pmSeattle/Tacoma Intl
18h 01m
1 stop
BWI5:44 pmBaltimore/Washington

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 10/3

9:59 pm-8:39 pm

2 stops25h 40m

Seattle/Tacoma Intl

Mon 10/6

6:12 am-5:42 pm

1 stop8h 30m

$214

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 10/24

6:29 pm-12:07 pm

1 stop20h 38m

Seattle/Tacoma Intl

Mon 10/27

2:31 pm-6:29 pm

2 stops24h 58m

$215

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 12/3

6:28 pm-12:59 am

1 stop9h 31m

Seattle/Tacoma Intl

Thu 12/4

9:05 am-9:27 pm

1 stop9h 22m

$222

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sat 11/8

10:10 am-6:00 pm

1 stop10h 50m

Seattle/Tacoma Intl

Wed 11/12

5:00 am-3:10 pm

1 stop7h 10m

$227

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 10/9

6:25 am-9:08 am

Nonstop5h 43m

Seattle/Tacoma Intl

Tue 10/14

4:20 pm-12:23 am

Nonstop5h 03m

$243

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 10/7

6:25 am-9:08 am

Nonstop5h 43m

Seattle/Tacoma Intl

Wed 10/8

4:20 pm-12:23 am

Nonstop5h 03m

$245

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 10/11

6:25 am-9:08 am

Nonstop5h 43m

Seattle/Tacoma Intl

Fri 10/17

4:20 pm-12:23 am

Nonstop5h 03m

$250

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 10/11

6:25 am-9:08 am

Nonstop5h 43m

Seattle/Tacoma Intl

Fri 10/17

4:20 pm-12:23 am

Nonstop5h 03m

$253

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 11/7

7:35 am-10:28 am

Nonstop5h 53m

Seattle/Tacoma Intl

Tue 11/11

4:59 pm-12:54 am

Nonstop4h 55m

$257

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Mon 11/3

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Mon 11/10

7:12 pm-5:58 am

1 stop7h 46m

$263

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Washington, D.C. to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Washington, D.C. and Seattle?

What is the cheapest month to fly to Seattle?

In general, September is the cheapest month to fly from Washington, D.C. to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $366. If you don’t want to visit Seattle in September, then you should wait until February to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $377.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Washington, D.C. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $441. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Washington, D.C. because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $577.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Washington, D.C. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $427 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $517. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Washington, D.C. to Seattle/Tacoma Intl flight route?

Fly from Baltimore/Washington to Seattle/Tacoma Intl for the best Washington, D.C. - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $407 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Washington, D.C. for as low as $340 on momondo.

What cabin class options are available on Washington, D.C. to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Washington, D.C. to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Washington, D.C. to Seattle flights?

No. A direct flight is the cheapest option for a flight between Washington, D.C. to Seattle.

How have Washington, D.C. to Seattle flight prices changed over time?

As of September 2025, prices for Washington, D.C. to Seattle flights are approximately 13% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Seattle (WAS to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Seattle

Best Price Found

$138

Fastest flight time

5h 35m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Washington, D.C. in the past 72 hours is $138. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $327.
The fastest flight from Washington, D.C. to Seattle takes 5h 35m
Direct flights go from Washington, D.C. to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
  • How far is Washington, D.C. to Seattle/Tacoma Intl by plane?

    The straight-line distance from Washington, D.C. to Seattle/Tacoma Intl is 2320.5 mi. 5h 43m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?

    Prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Washington, D.C. to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Washington, D.C. to Seattle?

  • What is the most popular airline from Washington, D.C. to Seattle?

Best airlines flying from Washington, D.C. to Seattle

Compare and see reviews for airlines that fly from Washington, D.C. to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $111Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $126Free CancellationRating
6.3
8,023 reviews
Search Spirit Airlines flights
Hawaiian AirlinesPriceFrom $157Free CancellationRating
7.8
2,729 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $182Free CancellationRating
7.9
7,961 reviews
Search Delta flights
American AirlinesPriceFrom $206Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $259Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $269Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $276Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
Sun Country AirPriceFrom $313Free CancellationRating
6.9
330 reviews
Search Sun Country Air flights
  • Alaska Airlines Flights From Washington, D.C. to Seattle

    Alaska Airlines flies from Washington, D.C. to Seattle around 18 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Washington, D.C. to Seattle in the last 72 hours was $269 (round-trip), much lower than the average airfare cost of $481 for Alaska Airlines flights on this route.

  • Delta Flights From Washington, D.C. to Seattle

    Across 7,961 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Washington, D.C. to Seattle about 14 times each week, with ticket deals ranging from $182 to $372. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Kirkland
Tukwila
Shoreline
Lakewood
Centralia
Fife
Cle Elum
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Seattle for you.

Can I find flights from Washington, D.C. to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Washington, D.C. to Seattle right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Washington, D.C. and alert you when they change.

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1 adult
Fri 10/17
Fri 10/24

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