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$90+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEA
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

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 September or February, booked 85 days in advance, depart on a Tuesday or Thursday and return on a Thursday

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 February 3, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/42:00 pm
DCA
-
SEA
1 stop25h 01m
Frontier
Mon 3/99:36 pm
SEA
-
DCA
2 stops21h 23m
Frontier
Deal found 2/1$191
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/236:00 pm
DCA
-
SEA
2 stops19h 54m
Frontier
Mon 3/212:30 pm
SEA
-
DCA
1 stop21h 45m
Frontier
Deal found 2/1$199
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/42:00 pm
DCA
-
SEA
1 stop25h 01m
Frontier
Tue 3/1010:08 pm
SEA
-
DCA
2 stops20h 51m
Frontier
Deal found 2/1$202
This Super.com deal was found by Cheapflights users on 2/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:00 am
DCA
-
SEA
1 stop31h 01m
Frontier
Sat 2/281:16 pm
SEA
-
DCA
1 stop29h 43m
Frontier
Deal found 2/1$206
This CheapOair deal was found by Cheapflights users on 2/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/271:59 pm
DCA
-
SEA
1 stop22h 28m
Frontier
Wed 4/296:57 pm
SEA
-
DCA
1 stop15h 03m
Frontier
Deal found 2/1$211
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Thu 3/52:00 pm
DCA
-
SEA
1 stop24h 19m
Frontier
Mon 3/912:24 pm
SEA
-
DCA
1 stop30h 35m
Frontier
Deal found 2/1$212
This ezTravel 易遊網 deal was found by Cheapflights users on 2/1. 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 ezTravel 易遊網 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/148:00 am
DCA
-
SEA
1 stop29h 55m
Frontier
Sat 2/211:16 pm
SEA
-
DCA
1 stop20h 59m
Frontier
Deal found 2/1$213
This United Airlines deal was found by Cheapflights users on 2/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/206:26 pm
BWI
-
SEA
1 stop9h 33m
United Airlines
Mon 2/235:20 pm
SEA
-
BWI
1 stop11h 07m
United Airlines
Deal found 2/2$214
This Kiwi.com deal was found by Cheapflights users on 1/31. 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.
Thu 3/52:00 pm
DCA
-
SEA
1 stop24h 19m
Frontier
Sun 3/89:35 pm
SEA
-
DCA
2 stops36h 27m
Frontier
Deal found 1/31$214
This American Airlines deal was found by Cheapflights users on 2/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:00 am
IAD
-
SEA
1 stop9h 27m
American Airlines
Sat 2/215:37 am
SEA
-
IAD
1 stop7h 57m
American Airlines
Deal found 2/3$217
This American Airlines deal was found by Cheapflights users on 2/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1712:38 pm
BWI
-
SEA
1 stop11h 28m
American Airlines
Sat 2/217:15 am
SEA
-
BWI
1 stop9h 24m
American Airlines
Deal found 2/1$217
This American Airlines deal was found by Cheapflights users on 2/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/171:44 pm
DCA
-
SEA
1 stop10h 22m
American Airlines
Sat 2/216:00 am
SEA
-
DCA
1 stop8h 23m
American Airlines
Deal found 2/2$217

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 February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(Kiwi.com)

One-way from

$90
(American Airlines)

Popular in

June

Cheapest in

September

Average price

$350

Good round-trip deal

$289 or less

Good one-way deal

$200 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. 8% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 3, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.

Fly from

Washington, D.C.

Fly to

Seattle

Route

Depart

Return

Price

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 2/20

6:26 pm-12:59 am

1 stop9h 33m

Seattle/Tacoma Intl

Mon 2/23

5:20 pm-7:27 am

1 stop11h 07m

$214

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 4/15

12:27 pm-6:28 pm

1 stop9h 01m

Seattle/Tacoma Intl

Sat 4/18

6:00 am-4:37 pm

1 stop7h 37m

$218

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 3/4

6:46 pm-9:50 pm

Nonstop6h 04m

Seattle/Tacoma Intl

Wed 3/11

9:46 am-5:46 pm

Nonstop5h 00m

$227

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 3/14

5:55 pm-8:56 pm

Nonstop6h 01m

Seattle/Tacoma Intl

Wed 3/18

8:00 am-4:02 pm

Nonstop5h 02m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 2/25

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 3/6

3:20 pm-11:10 pm

Nonstop4h 50m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 4/30

5:55 pm-8:53 pm

Nonstop5h 58m

Seattle/Tacoma Intl

Sun 5/3

11:14 pm-7:23 am

Nonstop5h 09m

$237

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 4/24

7:12 pm-11:53 pm

1 stop7h 41m

Seattle/Tacoma Intl

Wed 4/29

11:14 pm-9:11 am

1 stop6h 57m

$238

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 5/7

3:15 pm-10:42 pm

1 stop10h 27m

Seattle/Tacoma Intl

Sun 5/10

11:14 pm-7:23 am

Nonstop5h 09m

$247

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Thu 3/5

11:45 am-7:00 pm

1 stop10h 15m

Seattle/Tacoma Intl

Tue 3/10

7:35 pm-5:51 am

1 stop7h 16m

$257

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 3/3

6:05 pm-12:59 am

1 stop9h 54m

Seattle/Tacoma Intl

Tue 3/10

12:55 pm-11:20 pm

1 stop7h 25m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 60 results
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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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 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

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

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Seattle. Price data was last updated on January 30, 2026.

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 month to book a flight from Washington, D.C. to Seattle?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $111). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $223). 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 February 3, 2026.

It’s typically best to fly out from Washington, D.C. to Seattle in the evening. Doing so could potentially save you 8% on the flight price compared to flying in the morning, which is usually more expensive.

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 January 31, 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. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 February 3, 2026.

The most flights from WAS to SEA are scheduled on a Monday (27 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (21 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 62% 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.

Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $215.

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 13m.

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 23m.

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 February 3, 2026.
Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian 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
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,834 reviews
Alaska Airlines
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,138 reviews
Alaska Airlines
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,831 reviews
Alaska Airlines
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,236 reviews
Alaska Airlines
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Frontier
5.7
Fair
3,051 reviews
Alaska Airlines
8.0
Very good
11,834 reviews

Entertainment

7.0

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

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. 8 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 24 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 6h 04m. Fly via United Airlines, Delta, or Alaska Airlines to get the fastest option. There are 2327 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, Frontier ($111), Hawaiian Airlines ($143), and Delta ($145) offers the cheapest pricing from Washington, D.C. to Seattle. You may be able to fly from Washington, D.C. to Seattle for 70% 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 Frontier. According to our data, you can fly for as low as $99. Users have also found prices from $101 and $119 on Southwest 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. Dulles Intl - Seattle/Tacoma Intl, Washington, D.C. Reagan-National - Seattle/Tacoma Intl and Baltimore/Washington - Seattle/Tacoma Intl.

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

    Consider United Airlines (81%), Copa Airlines (78%) or Ethiopian Air (78%) 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 $1,022, our data indicates the cheapest price to be $128. The most popular route (Washington, D.C. Dulles Intl - Seattle/Tacoma Intl), is priced around $237.

  • 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, March is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $111). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $223). 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
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

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

Discover the top 8 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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$102Average$268FlexibilityNo cancel feeOn-time65%
DeltaCheapest$103Average$341FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$111Average$256FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$143Average$419FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$179Average$447FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$213Average$414FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$444FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$236Average$469FlexibilityNo cancel feeOn-time75%

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.