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$94+ Cheap flights from Washington, D.C. (WAS) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEA
Aug 15 — Aug 221
Sat 8/15
Sat 8/22
1 adult, Economy
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Find cheap flights from Washington, D.C. to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Washington, D.C. to Seattle/Tacoma Intl are usually found in February or January, booked 55 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Washington, D.C. to Seattle

Cheapest flights from Washington, D.C. to Seattle
Explore the most affordable flight options available from Washington, D.C. to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 16, 2026.

This Alaska Airlines deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:03 am
IAD
-
SEA
Nonstop5h 45m
Alaska Airlines
Mon 8/248:49 pm
SEA
-
IAD
1 stop18h 25m
Alaska Airlines
Deal found 7/16$305
This Priceline deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:00 am
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Sat 10/33:53 pm
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Deal found 7/16$306
This Alaska Airlines deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/97:35 pm
IAD
-
SEA
1 stop16h 45m
Alaska Airlines
Sun 9/139:35 pm
SEA
-
IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/16$307
This Booking.com deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:00 am
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Thu 9/39:35 pm
SEA
-
IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/13$308
This Alaska Airlines deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/287:00 am
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Fri 9/49:35 pm
SEA
-
IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/14$309
This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/147:00 am
DCA
-
SEA
1 stop29h 04m
Frontier
Tue 8/188:53 pm
SEA
-
DCA
2 stops36h 58m
Frontier
Deal found 7/15$309
This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:50 am
IAD
-
SEA
1 stop28h 14m
Frontier
Sun 8/168:53 pm
SEA
-
IAD
1 stop8h 27m
Frontier
Deal found 7/15$310
This Alaska Airlines deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:00 am
DCA
-
SEA
Nonstop5h 54m
Alaska Airlines
Tue 9/17:40 am
SEA
-
DCA
1 stop10h 20m
Alaska Airlines
Deal found 7/15$310
This Kiwi.com deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
-
SEA
1 stop28h 26m
Frontier
Tue 8/252:37 pm
SEA
-
IAD
2 stops14h 27m
Frontier
Deal found 7/14$311
This Kiwi.com deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/36:00 pm
DCA
-
SEA
1 stop18h 17m
Frontier
Thu 10/157:41 pm
SEA
-
DCA
1 stop14h 09m
Frontier
Deal found 7/13$311
This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:50 am
IAD
-
SEA
1 stop28h 14m
Frontier
Sun 8/168:53 pm
SEA
-
IAD
1 stop8h 27m
Frontier
Deal found 7/15$312
This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:00 pm
DCA
-
SEA
Nonstop5h 51m
Multiple Airlines
Mon 8/317:06 pm
SEA
-
DCA
1 stop18h 53m
Multiple Airlines
Deal found 7/15$312

Find flight deals from Washington, D.C. to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$305
(Alaska Airlines)

One-way from

$94
(Southwest)

Popular in

July

Cheapest in

February

Average price

$508

Good round-trip deal

$400 or less

Good one-way deal

$228 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Seattle/Tacoma Intl flights.
Search Deals
From Washington, D.C. (WAS) to Seattle/Tacoma Intl
Search Deals
One-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated July 16, 2026.
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

Cheapest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 9/21

4:45 pm-7:25 pm

Nonstop5h 40m

Seattle/Tacoma Intl

Sat 9/26

7:20 am-3:32 pm

Nonstop5h 12m

$315

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 8/27

4:55 pm-12:40 am

2 stops10h 45m

Seattle/Tacoma Intl

Wed 9/2

11:10 am-11:55 pm

2 stops9h 45m

$326

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 8/25

3:50 pm-11:05 pm

2 stops10h 15m

Seattle/Tacoma Intl

Tue 9/15

11:10 am-11:55 pm

2 stops9h 45m

$326

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Mon 9/21

5:15 pm-10:45 pm

1 stop8h 30m

Seattle/Tacoma Intl

Thu 10/1

7:00 am-5:44 pm

1 stop7h 44m

$346

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 8/18

4:35 pm-7:41 pm

Nonstop6h 06m

Seattle/Tacoma Intl

Mon 8/24

7:20 am-3:21 pm

Nonstop5h 01m

$351

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 10/14

7:00 am-9:45 am

Nonstop5h 45m

Seattle/Tacoma Intl

Tue 11/10

8:05 am-4:14 pm

Nonstop5h 09m

$357

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 10/13

1:05 pm-3:51 pm

Nonstop5h 46m

Seattle/Tacoma Intl

Sun 10/18

11:14 pm-7:17 am

Nonstop5h 03m

$357

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 8/14

4:55 pm-12:40 am

2 stops10h 45m

Seattle/Tacoma Intl

Fri 8/21

5:00 am-8:55 pm

2 stops12h 55m

$361

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/26

3:50 pm-11:05 pm

2 stops10h 15m

Seattle/Tacoma Intl

Wed 9/2

5:20 am-6:25 pm

2 stops10h 05m

$366

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 9/2

6:40 pm-8:35 am

2 stops16h 55m

Seattle/Tacoma Intl

Thu 9/10

5:00 am-5:50 pm

2 stops9h 50m

$371

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/16

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from Washington, D.C. to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Seattle in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C.-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Washington, D.C. to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Washington, D.C. with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Seattle

What is the cheapest month to book a flight from Washington, D.C. to Seattle?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $119). Flying from Washington, D.C. to Seattle in December is currently the most expensive (average of $778). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WAS to SEA?

Find hourly flight availability from Washington, D.C. to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 16, 2026.

It’s typically best to fly out from Washington, D.C. to Seattle in the afternoon. Doing so could potentially save you 17% on the flight price compared to flying at noon, which is usually more expensive.

Weekly flight availability from Washington, D.C. to Seattle

Explore weekly flight availability from Washington, D.C. to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 16, 2026.

The most flights from WAS to SEA are scheduled on a Thursday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).

How much does it cost to fly round-trip from Washington, D.C. to Seattle?

What’s the top layover airport for flights from Washington, D.C. to Seattle?

Share of 1-stop round-trip flights from Washington, D.C. to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 78% of 1-stop itineraries from Washington, D.C. to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to Seattle?

Average round-trip fare for 1-stop flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Chicago (ORD) is the most affordable 1-stop option, with an average round-trip price of $326.

What’s the fastest layover option from Washington, D.C. to Seattle?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 10m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to Seattle?

Average layover duration for 1-stop one-way flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 13m.

How far ahead should I book a flight from Washington, D.C. to Seattle?

The best time to book flights from Washington, D.C. to Seattle is 85 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Washington, D.C. to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Seattle. Price data was last updated on July 11, 2026.

Travelers seeking maximum savings on their Washington, D.C. to Seattle flight should consider departing on Tuesday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Washington, D.C. to Seattle flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to Seattle trip
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated July 16, 2026.
Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Washington, D.C. to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.
Alaska Airlines
7.9
Good
12,661 reviews
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.
Delta
7.8
Good
8,472 reviews
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.
United Airlines
7.4
Good
9,993 reviews
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.
American Airlines
7.1
Good
11,818 reviews
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.
Frontier
5.6
Fair
2,796 reviews
Alaska Airlines
7.9
Good
12,661 reviews

Entertainment

7.0

Overall

7.9

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2026

RDU - SEA

There was almost a 2 hour delay after arriving before our next flight. Also my husband needed a wheelchair and it seemed hard to get help.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Washington, D.C.?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to Seattle. 9 airlines have flights to Seattle/Tacoma Intl from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 22 inbound flights from Washington, D.C. per day.

  • How long is the flight from Washington, D.C. to Seattle?

    There are many flights that can get you from Washington, D.C. to Seattle in 5h 40m. Fly via Delta, Southwest, or United Airlines to get the fastest option. There are 2321 mi between Washington, D.C. and Seattle. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Washington, D.C. to Seattle round-trip?

    According to our current data, Hawaiian Airlines ($138), Delta ($145), and Frontier ($167) offers the cheapest pricing from Washington, D.C. to Seattle. You may be able to fly from Washington, D.C. to Seattle for 64% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Washington, D.C. to Seattle one-way?

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $101. Users have also found prices from $113 and $119 on Frontier and Alaska Airlines, respectively.

  • What are the most popular routes from Washington, D.C. to Seattle?

    The most popular flight routes from Washington, D.C. to Seattle are Washington, D.C. Reagan-National - Seattle/Tacoma Intl, Washington, D.C. Dulles Intl - Seattle/Tacoma Intl and Baltimore/Washington - Seattle/Tacoma Intl.

  • What are the most reliable airlines from Washington, D.C. to Seattle?

    Consider Finnair (100%), Japan Airlines (89%) or United Airlines (88%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. to Seattle.

  • What are the cheapest flights from Washington, D.C. to Seattle?

    Looking for the cheapest flight from Washington, D.C. to Seattle? While on average our users pay $1,341, our data indicates the cheapest price to be $147. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around $262.

  • Can I find deals for flights from Washington, D.C. to Seattle that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Seattle.

  • Can I find deals for business class flights from Washington, D.C. to Seattle?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $119). Flying from Washington, D.C. to Seattle in December is currently the most expensive (average of $778). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Lacey
Leavenworth
Olympia
Ocean Shores
Edmonds
Snoqualmie
Tumwater
Tukwila
Renton
Kent
Lynnwood
Puyallup
Ellensburg
Fife
Marysville
Lakewood
Issaquah
Shoreline

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 9 airlines flying from Washington, D.C. to Seattle

Discover the top 9 airlines that operate flights from Washington, D.C. to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$99Average$351FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$138Average$369FlexibilityNo cancel feeOn-time85%
FrontierCheapest$167Average$319FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$179Average$445FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$199Average$421FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$420FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$219Average$369FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$225Average$478FlexibilityNo cancel feeOn-time75%
Sun Country AirCheapest$295Average$465FlexibilityNo cancel feeOn-time83%

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