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$121+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SEA
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/276:00 pm
DCA
-
SEA
1 stop21h 01m
Frontier
Mon 3/212:30 pm
SEA
-
DCA
1 stop30h 29m
Frontier
Deal found 1/27$189
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 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
2 stops24h 01m
Frontier
Mon 3/912:24 pm
SEA
-
DCA
1 stop21h 38m
Frontier
Deal found 1/28$190
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Sat 2/142:00 pm
DCA
-
SEA
1 stop23h 55m
Frontier
Sat 2/211:16 pm
SEA
-
DCA
1 stop20h 59m
Frontier
Deal found 1/27$196
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/286:00 pm
DCA
-
SEA
1 stop19h 55m
Frontier
Sun 3/89:35 pm
SEA
-
DCA
2 stops36h 27m
Frontier
Deal found 1/27$205
This Super.com deal was found by Cheapflights users on 1/27. 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 2/188:00 am
DCA
-
SEA
1 stop31h 01m
Frontier
Mon 2/2312:30 pm
SEA
-
DCA
1 stop21h 45m
Frontier
Deal found 1/27$206
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/286:00 pm
DCA
-
SEA
1 stop19h 55m
Frontier
Tue 3/1010:08 pm
SEA
-
DCA
2 stops20h 51m
Frontier
Deal found 1/27$208
This SmartFares deal was found by Cheapflights users on 1/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:27 pm
IAD
-
SEA
Nonstop6h 08m
Alaska Airlines
Wed 2/259:27 am
SEA
-
IAD
Nonstop4h 53m
Alaska Airlines
Deal found 1/28$209
This SmartFares deal was found by Cheapflights users on 1/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/198:00 am
DCA
-
SEA
Nonstop6h 10m
Alaska Airlines
Wed 2/258:00 am
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Deal found 1/28$209
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:00 am
DCA
-
SEA
2 stops29h 55m
Frontier
Fri 2/2712:00 pm
SEA
-
DCA
1 stop22h 00m
Frontier
Deal found 1/28$212
This Mytrip deal was found by Cheapflights users on 1/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/266:00 pm
DCA
-
SEA
1 stop19h 55m
Frontier
Mon 3/212:30 pm
SEA
-
DCA
1 stop21h 45m
Frontier
Deal found 1/28$215
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Sun 3/17:05 am
IAD
-
SEA
Nonstop6h 00m
Hawaiian Airlines
Mon 3/99:45 pm
SEA
-
IAD
Nonstop4h 55m
Hawaiian Airlines
Deal found 1/27$226
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:05 am
IAD
-
SEA
Nonstop6h 00m
Alaska Airlines
Mon 3/99:45 pm
SEA
-
IAD
Nonstop4h 55m
Alaska Airlines
Deal found 1/28$236

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$189
(Kiwi.com)

One-way from

$121
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$368

Good round-trip deal

$273 or less

Good one-way deal

$191 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 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. 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 January 2026
Search Deals
Price to beat on a round-trip flight from District of Columbia to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from District of Columbia to Seattle/Tacoma Intl.
Search Deals

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 January 29, 2026.
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

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 4/24

7:20 pm-10:05 pm

Nonstop5h 45m

Seattle/Tacoma Intl

Wed 5/6

3:55 pm-12:09 am

Nonstop5h 14m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 4/25

5:55 pm-8:53 pm

Nonstop5h 58m

Seattle/Tacoma Intl

Sat 5/2

8:00 am-4:12 pm

Nonstop5h 12m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 4/23

9:00 am-11:47 am

Nonstop5h 47m

Seattle/Tacoma Intl

Sat 5/2

10:00 am-6:20 pm

Nonstop5h 20m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Mon 3/2

4:10 pm-12:59 am

1 stop11h 49m

Seattle/Tacoma Intl

Mon 3/9

8:00 am-4:02 pm

Nonstop5h 02m

$247

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 5/2

5:55 pm-8:53 pm

Nonstop5h 58m

Seattle/Tacoma Intl

Sat 5/9

7:36 pm-7:35 am

1 stop8h 59m

$247

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 5/7

5:55 pm-8:53 pm

Nonstop5h 58m

Seattle/Tacoma Intl

Sat 5/9

2:23 pm-12:18 am

1 stop6h 55m

$247

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/3

5:06 pm-10:18 pm

1 stop8h 12m

Seattle/Tacoma Intl

Tue 3/10

7:10 am-9:02 pm

1 stop10h 52m

$257

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/3

5:00 pm-8:11 pm

Nonstop6h 11m

Seattle/Tacoma Intl

Sat 3/7

1:56 pm-9:59 pm

Nonstop5h 03m

$257

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 3/3

3:58 pm-9:12 pm

1 stop8h 14m

Seattle/Tacoma Intl

Sat 3/7

7:00 am-5:40 pm

1 stop7h 40m

$257

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 5/13

5:11 pm-10:59 pm

1 stop8h 48m

Seattle/Tacoma Intl

Sat 5/16

2:23 pm-12:18 am

1 stop6h 55m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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 $111). Flying from District of Columbia to Seattle in July is currently the most expensive (average of $221). 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 January 29, 2026.

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 8% 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 January 24, 2026.

Travelers seeking maximum savings on their District of Columbia 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 District of Columbia to Seattle

Explore weekly flight availability from District of Columbia 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 January 29, 2026.

The most flights from USDC to SEA are scheduled on a Thursday (18 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (16 on average).

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 45m. 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 Frontier, with whom users have recently found tickets for as low as $93. However, be on the lookout for offers from Southwest and Spirit 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: United Airlines (86%), Copa Airlines (85%), Ethiopian Air (85%).

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

    The cheapest flight price from District of Columbia to Seattle is $138. On average you can expect to pay $965. The most popular route, (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), can usually be booked for $243.

  • 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 $111). Flying from District of Columbia to Seattle in July is currently the most expensive (average of $221). 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

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Alternative routes for District of Columbia to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$102Average$268FlexibilityNo cancel feeOn-time65%
DeltaCheapest$103Average$343FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$111Average$256FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$143Average$419FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$179Average$442FlexibilityNo cancel feeOn-time71%
Sun Country AirCheapest$186Average$338FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$213Average$415FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$446FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$236Average$470FlexibilityNo cancel feeOn-time75%

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