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$139+ Cheap flights from District of Columbia 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SEA
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find flight deals from District of Columbia to Seattle

Cheapest flights from District of Columbia to Seattle
Explore the most affordable flight options available from District of Columbia to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This SmartFares deal was found by Cheapflights users on 10/29. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:38 amIAD - SEA
Nonstop5h 54mHawaiian Airlines
Thu 12/410:11 pmSEA - IAD
Nonstop4h 55mHawaiian Airlines
Deal found 10/29$234
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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.
Fri 12/57:34 amIAD - SEA
Nonstop6h 01mAlaska Airlines
Sun 12/710:11 pmSEA - IAD
Nonstop4h 55mAlaska Airlines
Deal found 10/28$235
This CheapOair deal was found by Cheapflights users on 10/30. 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 11/106:00 pmDCA - SEA
1 stop21h 07mFrontier
Thu 11/1312:58 pmSEA - DCA
1 stop21h 04mFrontier
Deal found 10/30$236
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 12/56:30 pmIAD - SEA
Nonstop6h 00mAlaska Airlines
Mon 12/810:11 pmSEA - IAD
Nonstop4h 55mAlaska Airlines
Deal found 10/28$237
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 12/85:00 pmDCA - SEA
Nonstop6h 13mAlaska Airlines
Tue 12/161:56 pmSEA - DCA
Nonstop5h 03mAlaska Airlines
Deal found 10/29$237
This Delta deal was found by Cheapflights users on 10/29. 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 11/277:15 amIAD - SEA
Nonstop6h 04mDelta
Wed 12/33:30 pmSEA - IAD
Nonstop4h 57mDelta
Deal found 10/29$238
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/278:00 amDCA - SEA
Nonstop6h 05mHawaiian Airlines
Thu 12/41:56 pmSEA - DCA
Nonstop5h 03mHawaiian Airlines
Deal found 10/30$239
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/278:00 amDCA - SEA
Nonstop6h 05mHawaiian Airlines
Wed 12/37:20 amSEA - DCA
1 stop10h 42mHawaiian Airlines
Deal found 10/30$241
This CheapOair deal was found by Cheapflights users on 10/30. 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 11/172:00 pmDCA - SEA
1 stop25h 07mFrontier
Sun 11/2312:46 pmSEA - DCA
1 stop21h 17mFrontier
Deal found 10/30$243
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 11/136:00 pmDCA - SEA
2 stops51h 32mFrontier
Tue 11/181:37 pmSEA - DCA
1 stop20h 25mFrontier
Deal found 10/29$244
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/125:55 pmIAD - SEA
Nonstop5h 59mUnited Airlines
Mon 12/157:34 pmSEA - IAD
1 stop8h 56mUnited Airlines
Deal found 10/29$247
This KAYAK deal was found by Cheapflights users on 10/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:00 pmDCA - SEA
Nonstop6h 13mAlaska Airlines
Tue 12/98:05 amSEA - DCA
1 stop8h 55mAlaska Airlines
Deal found 10/30$247

Cheap flight deals from District of Columbia to Seattle

Keep the following information in mind while searching for District of Columbia to Seattle flight deals. Data was last updated October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$234
(SmartFares)

One-way from

$139
(Delta)

Popular in

December

Cheapest in

September

Average price

$397

Good round-trip deal

$341 or less

Good one-way deal

$186 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Seattle/Tacoma Intl flights.
Search Deals
From District of Columbia to Seattle/Tacoma Intl
Search Deals
One-way flight from District of Columbia to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 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 District of Columbia to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from District of Columbia to Seattle/Tacoma Intl.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 October 30, 2025.
Use the filters below to find and compare flights from District of Columbia to Seattle that are best for you.

Fly from

District of Columbia

Fly to

Seattle

Route

Depart

Return

Price

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 1/14

8:00 am-11:09 am

Nonstop6h 09m

Seattle/Tacoma Intl

Sun 1/18

1:55 pm-9:59 pm

Nonstop5h 04m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 1/14

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Sun 1/18

3:20 pm-11:10 pm

Nonstop4h 50m

$238

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 12/12

5:55 pm-8:54 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Sun 12/14

10:40 am-9:18 pm

1 stop7h 38m

$247

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 12/10

5:37 pm-12:12 am

1 stop9h 35m

Seattle/Tacoma Intl

Mon 12/15

7:59 pm-5:30 pm

1 stop18h 31m

$256

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 1/8

5:26 pm-9:28 am

1 stop19h 02m

Seattle/Tacoma Intl

Sun 1/11

8:21 pm-5:04 pm

1 stop17h 43m

$256

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 12/16

8:59 am-5:27 pm

1 stop11h 28m

Seattle/Tacoma Intl

Thu 1/8

8:06 am-8:00 pm

1 stop8h 54m

$256

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 1/8

8:00 am-11:09 am

Nonstop6h 09m

Seattle/Tacoma Intl

Sun 1/11

1:55 pm-9:59 pm

Nonstop5h 04m

$257

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 12/11

5:55 pm-8:54 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 12/15

7:34 pm-7:30 am

1 stop8h 56m

$267

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 11/27

12:50 pm-7:25 pm

1 stop9h 35m

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-11:59 pm

1 stop7h 19m

$278

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 12/30

8:26 am-11:27 am

Nonstop6h 01m

Seattle/Tacoma Intl

Fri 1/9

8:10 am-4:16 pm

Nonstop5h 06m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 44 results
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Best time to book a flight from District of Columbia to Seattle

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

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

Currently, March is the cheapest month in which you can book a flight from District of Columbia to Seattle (average of $109). Flying from District of Columbia to Seattle in July is currently the most expensive (average of $232). 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 DC to SEA?

Find hourly flight availability from District of Columbia 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 October 30, 2025.

A simple way to save on the total cost of your ticket is to fly from District of Columbia to Seattle in the evening. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from District of Columbia to Seattle. Price data was last updated on October 26, 2025.

Travelers seeking maximum savings on their District of Columbia to Seattle flight should consider departing on Monday at noon 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.

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

Related info for your journey

Find useful and relevant information for your journey from District of Columbia 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 District of Columbia?

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

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

    Departing from District of Columbia to Seattle will take you 5h 59m. Airlines will cover a distance of 2299 mi. All flights are typically nonstop.

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

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $139. However, be on the lookout for offers from United Airlines and Alaska Airlines, as they are both options that can get you from District of Columbia to Seattle for a low price.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from District of Columbia to Seattle on time: Japan Airlines (100%), Finnair (100%), United Airlines (97%).

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

    The cheapest flight price from District of Columbia to Seattle is $139. On average you can expect to pay $1,000. The most popular route, (Washington, D.C. Dulles Intl - Seattle/Tacoma Intl), can usually be booked for $227.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from District of Columbia to Seattle (average of $109). Flying from District of Columbia to Seattle in July is currently the most expensive (average of $232). 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
Tukwila
Tacoma
Lakewood
Olympia
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
Federal Way
Cle Elum
Marysville
Puyallup
Chehalis
Fife
Issaquah

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Alternative routes for District of Columbia to Seattle

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Top 9 airlines flying from District of Columbia to Seattle

Discover the top 9 airlines that operate flights from District of Columbia 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$262FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$126Average$275FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$149Average$444FlexibilityNo cancel feeOn-time85%
DeltaCheapest$186Average$364FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$206Average$464FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$238Average$492FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$238Average$425FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$275Average$484FlexibilityNo cancel feeOn-time75%
Sun Country AirCheapest$313Average$402FlexibilityNo cancel feeOn-time83%

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