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District of Columbia

$143+ Cheap flights from Seattle (SEA) to District of Columbia

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 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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Find flight deals from Seattle to District of Columbia

Cheapest flights from Seattle to District of Columbia
Explore the most affordable flight options available from Seattle to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2025.

This Gotogate deal was found by Cheapflights users on 10/18. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/812:58 pmSEA - DCA
1 stop21h 04mFrontier
Fri 11/142:00 pmDCA - SEA
1 stop25h 13mFrontier
Deal found 10/18$247
This Alaska Airlines deal was found by Cheapflights users on 10/18. 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.
Mon 12/151:56 pmSEA - DCA
Nonstop5h 03mAlaska Airlines
Sat 1/178:00 amDCA - SEA
Nonstop5h 55mAlaska Airlines
Deal found 10/18$248
This Alaska Airlines deal was found by Cheapflights users on 10/18. 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.
Mon 12/1510:11 pmSEA - IAD
Nonstop4h 55mAlaska Airlines
Sun 1/186:04 pmIAD - SEA
Nonstop6h 04mAlaska Airlines
Deal found 10/18$248
This Kiwi.com deal was found by Cheapflights users on 10/18. 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.
Sat 11/112:58 pmSEA - DCA
1 stop22h 04mFrontier
Mon 11/36:00 pmDCA - SEA
1 stop21h 07mFrontier
Deal found 10/18$249
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Wed 11/128:00 amSEA - IAD
Nonstop5h 07mUnited Airlines
Wed 11/192:25 pmIAD - SEA
1 stop9h 48mUnited Airlines
Deal found 10/18$249
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Sat 11/158:22 pmSEA - DCA
2 stops37h 40mFrontier
Wed 11/192:00 pmDCA - SEA
1 stop24h 56mFrontier
Deal found 10/19$250
This CheapOair deal was found by Cheapflights users on 10/20. 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.
Wed 10/228:43 pmSEA - DCA
1 stop12h 21mFrontier
Tue 10/286:31 pmDCA - SEA
1 stop20h 57mFrontier
Deal found 10/20$252
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 12/48:40 amSEA - IAD
Nonstop4h 56mHawaiian Airlines
Thu 12/115:37 pmIAD - SEA
1 stop9h 35mHawaiian Airlines
Deal found 10/20$252
This Delta deal was found by Cheapflights users on 10/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:25 amSEA - DCA
1 stop7h 36mDelta
Sun 12/144:55 pmDCA - SEA
Nonstop5h 53mDelta
Deal found 10/20$253
This American Airlines deal was found by Cheapflights users on 10/20. 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.
Thu 11/1312:59 amSEA - DCA
1 stop8h 00mAmerican Airlines
Mon 11/173:25 pmDCA - SEA
1 stop10h 53mAmerican Airlines
Deal found 10/20$254
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Tue 11/1811:59 pmSEA - IAD
1 stop8h 29mUnited Airlines
Thu 1/85:17 pmIAD - SEA
1 stop8h 26mUnited Airlines
Deal found 10/18$254
This Cheapflightsfares deal was found by Cheapflights users on 10/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:56 pmSEA - DCA
Nonstop5h 03mAlaska Airlines
Wed 12/108:00 amDCA - SEA
Nonstop6h 11mAlaska Airlines
Deal found 10/18$255

Cheap flight deals from Seattle to District of Columbia

Keep the following information in mind while searching for Seattle to District of Columbia flight deals. Data was last updated October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$247
(Gotogate)

One-way from

$143
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$398

Good round-trip deal

$308 or less

Good one-way deal

$188 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Washington, D.C. (WAS) flights.
Search Deals
From Seattle/Tacoma Intl to District of Columbia
Search Deals
One-way flight from Seattle/Tacoma Intl to District of Columbia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($56 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 October 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to District of Columbia.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to District of Columbia.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to District of Columbia 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 October 20, 2025.
Use the filters below to find and compare flights from Seattle to District of Columbia that are best for you.

Fly from

Seattle

Fly to

District of Columbia

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 12/15

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

Mon 1/19

8:00 am-10:55 am

Nonstop5h 55m

$248

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 12/15

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

Sat 1/17

8:00 am-10:55 am

Nonstop5h 55m

$248

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 12/15

10:11 pm-6:06 am

Nonstop4h 55m

Washington, D.C. Dulles Intl

Wed 1/14

6:04 pm-9:08 pm

Nonstop6h 04m

$248

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 2/27

12:37 pm-1:08 am

1 stop9h 31m

Washington, D.C. Dulles Intl

Sun 3/1

5:55 pm-8:56 pm

Nonstop6h 01m

$249

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 12/11

8:10 am-4:18 pm

Nonstop5h 08m

Washington, D.C. Dulles Intl

Mon 12/15

5:55 pm-8:54 pm

Nonstop5h 59m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 12/18

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Fri 1/16

5:01 pm-8:07 pm

Nonstop6h 06m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 12/4

8:40 am-4:36 pm

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 12/15

7:34 am-10:35 am

Nonstop6h 01m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 3/3

9:55 am-9:10 pm

1 stop8h 15m

Washington, D.C. Reagan-National

Wed 3/4

5:10 pm-10:24 pm

1 stop8h 14m

$258

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 1/31

7:15 am-9:00 pm

1 stop10h 45m

Washington, D.C. Reagan-National

Sat 2/7

6:56 pm-8:18 am

1 stop16h 22m

$258

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 11/12

11:59 pm-11:28 am

1 stop8h 29m

Washington, D.C. Dulles Intl

Wed 11/19

5:15 pm-10:28 pm

1 stop8h 13m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/18

Showing 1-10 of 42 results
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Best time to book a flight from Seattle to District of Columbia

Have a flexible travel schedule? Discover the best time to fly to District of Columbia from Seattle 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 Seattle to District of Columbia

What is the cheapest month to book a flight from Seattle to District of Columbia?

Currently, May is the cheapest month in which you can book a flight from Seattle to District of Columbia (average of $117). Flying from Seattle to District of Columbia in December is currently the most expensive (average of $216). 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 SEA to DC?

Find hourly flight availability from Seattle to District of Columbia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 20, 2025.

One of the essential ways to save on airfare from Seattle to District of Columbia is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 28% on airfare.

What is the cheapest day to fly from Seattle to District of Columbia?

Use this chart to determine the cheapest time to fly round-trip from Seattle to District of Columbia. Price data was last updated on October 19, 2025.

Travelers seeking maximum savings on their Seattle to District of Columbia flight should consider departing on Thursday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to District of Columbia

Explore weekly flight availability from Seattle to District of Columbia. 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 October 20, 2025.

The most flights from SEA to USDC are scheduled on a Monday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

How much does it cost to fly round-trip from Seattle to District of Columbia?

Reviews of airlines servicing District of Columbia

Get insights into the airlines that provide service to District of Columbia. 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 District of Columbia. Reviews last updated October 20, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian Airlines from Seattle to District of Columbia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,134 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
7,976 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Hawaiian Airlines
7.8
Good
2,785 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
8,993 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Frontier
5.8
Fair
3,130 reviews
Alaska Airlines
8.0
Very good
11,134 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

Find useful and relevant information for your journey from Seattle to District of Columbia. 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 from for flights from Seattle to District of Columbia?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to District of Columbia. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Seattle to District of Columbia?

    There are many flights that can get you from Seattle to District of Columbia in 5h 03m. Fly via Alaska Airlines, United Airlines, or Hawaiian Airlines to get the fastest option. There are 2321 mi between Seattle and District of Columbia. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Seattle to District of Columbia one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $145. Users have also found prices from $149 and $149 on Alaska Airlines and Delta, respectively.

  • What are the most reliable airlines from Seattle to District of Columbia?

    Before booking your flight to District of Columbia from Seattle, check out the most reliable airlines to get you to your destination on time: STARLUX Airlines (100%), Avianca (98%), Lufthansa( 98%).

  • What are the cheapest flights from Seattle to District of Columbia?

    While on average a flight from Seattle to District of Columbia is generally $983, our data shows the cheapest flight currently is $139. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), you can expect to pay $215 for that flight.

  • Can I find deals for flights from Seattle to District of Columbia that include hotel bookings?

    Yes. In addition to deals on Seattle to District of Columbia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to District of Columbia?

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

  • Can I find deals for business class flights from Seattle to District of Columbia?

    Yes. Cheapflights offers flight deals from Seattle to District of Columbia 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 Seattle to District of Columbia?

    Currently, May is the cheapest month in which you can book a flight from Seattle to District of Columbia (average of $117). Flying from Seattle to District of Columbia in December is currently the most expensive (average of $216). 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.

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Alternative routes for Seattle to District of Columbia

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Top 8 airlines flying from Seattle to District of Columbia

Discover the top 8 airlines that operate flights from Seattle to District of Columbia. 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 October 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$276FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$130Average$276FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$143Average$402FlexibilityNo cancel feeOn-time85%
DeltaCheapest$192Average$387FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$206Average$478FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$419FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$266Average$470FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$277Average$471FlexibilityNo cancel feeOn-time75%

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