HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
District of Columbia

$130+ 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 1/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
Jan 4 — Jan 111
Sun 1/4
Sun 1/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to District of Columbia 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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 December 5, 2025.

This CheapOair deal was found by Cheapflights users on 12/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:25 pmSEA - DCA
1 stop20h 36mFrontier
Wed 1/78:59 amDCA - SEA
1 stop29h 22mFrontier
Deal found 12/3$228
This United Airlines deal was found by Cheapflights users on 12/4. 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 12/3011:59 pmSEA - IAD
1 stop8h 46mUnited Airlines
Wed 1/75:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/4$228
This CheapOair deal was found by Cheapflights users on 12/4. 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.
Tue 12/302:54 pmSEA - DCA
1 stop28h 05mFrontier
Wed 1/76:00 pmDCA - SEA
1 stop20h 21mFrontier
Deal found 12/4$234
This Mytrip deal was found by Cheapflights users on 12/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:48 pmSEA - DCA
1 stop21h 18mFrontier
Fri 12/126:00 pmDCA - SEA
1 stop20h 53mFrontier
Deal found 12/3$240
This Southwest deal was found by Cheapflights users on 12/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:35 amSEA - DCA
1 stop8h 40mSouthwest
Thu 1/83:25 pmDCA - SEA
2 stops10h 05mSouthwest
Deal found 12/4$265
This Alaska Airlines deal was found by Cheapflights users on 12/4. 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.
Thu 12/258:00 amSEA - DCA
Nonstop5h 05mAlaska Airlines
Tue 1/68:00 amDCA - SEA
Nonstop5h 55mAlaska Airlines
Deal found 12/4$268
This CheapOair deal was found by Cheapflights users on 12/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:48 pmSEA - DCA
1 stop30h 11mFrontier
Thu 12/182:00 pmDCA - SEA
1 stop25h 30mFrontier
Deal found 12/3$275
This Southwest deal was found by Cheapflights users on 12/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:35 amSEA - DCA
1 stop8h 40mSouthwest
Mon 1/54:50 pmDCA - SEA
1 stop10h 40mSouthwest
Deal found 12/4$278
This Delta deal was found by Cheapflights users on 12/4. 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 12/257:35 amSEA - DCA
Nonstop5h 01mDelta
Thu 1/84:44 pmDCA - SEA
Nonstop5h 59mDelta
Deal found 12/4$283
This CheapOair deal was found by Cheapflights users on 12/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:25 pmSEA - DCA
1 stop20h 36mFrontier
Sun 1/46:00 pmDCA - SEA
1 stop21h 30mFrontier
Deal found 12/2$284
This CheapOair deal was found by Cheapflights users on 12/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:48 pmSEA - DCA
1 stop21h 18mFrontier
Sun 12/146:00 pmDCA - SEA
1 stop20h 53mFrontier
Deal found 12/3$289
This Delta deal was found by Cheapflights users on 12/4. 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 12/257:35 amSEA - DCA
Nonstop5h 01mDelta
Wed 1/75:10 pmDCA - SEA
1 stop9h 12mDelta
Deal found 12/4$293

Find 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 December 5, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$226
(Kiwi.com)

One-way from

$130
(United Airlines)

Popular in

November

Cheapest in

August

Average price

$480

Good round-trip deal

$283 or less

Good one-way deal

$223 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. 11% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 5, 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 - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/8

7:00 am-8:49 pm

1 stop10h 49m

Washington, D.C. Dulles Intl

Mon 1/19

5:55 pm-8:57 pm

Nonstop6h 02m

$228

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 2/5

8:06 am-8:00 pm

1 stop8h 54m

Washington, D.C. Reagan-National

Sat 2/7

8:00 am-11:09 am

Nonstop6h 09m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/8

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 1/21

3:42 pm-11:15 pm

1 stop10h 33m

$229

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/9

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Thu 1/22

8:59 am-5:29 pm

1 stop11h 30m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/6

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 1/21

6:00 am-12:20 pm

1 stop9h 20m

$229

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/9

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Tue 1/20

9:59 am-5:52 pm

1 stop10h 53m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/6

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Sun 1/18

12:23 pm-8:00 pm

1 stop10h 37m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 3/2

12:43 pm-11:21 pm

1 stop7h 38m

Washington, D.C. Dulles Intl

Fri 3/6

1:15 pm-7:03 pm

1 stop8h 48m

$234

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/9

8:30 am-4:26 pm

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 1/12

6:04 pm-9:08 pm

Nonstop6h 04m

$238

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/13

8:45 am-9:55 pm

2 stops10h 10m

Washington, D.C. Dulles Intl

Sat 1/17

3:45 pm-9:05 pm

1 stop8h 20m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/4

Showing 1-10 of 44 results
1
2
3
...
5

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 $115). 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 December 5, 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 29% 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 November 29, 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 December 5, 2025.

The most flights from SEA to USDC are scheduled on a Thursday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (11 on average).

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 December 5, 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
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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
11,404 reviews
Alaska Airlines
8.0
Very good
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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
8,010 reviews
Alaska Airlines
8.0
Very good
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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
2,817 reviews
Alaska Airlines
8.0
Very good
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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
9,065 reviews
Alaska Airlines
8.0
Very good
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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
3,090 reviews
Alaska Airlines
8.0
Very good
11,404 reviews

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

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 4h 50m. Fly via United Airlines, Alaska Airlines, or Delta to get the fastest option. There are 2299 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 Frontier. According to our data, you can fly for as low as $83. Users have also found prices from $93 and $103 on Southwest and American Airlines, 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: Copa Airlines (100%), Avianca (97%), United Airlines( 96%).

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

    While on average a flight from Seattle to District of Columbia is generally $1,065, our data shows the cheapest flight currently is $155. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $159 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 $115). 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.

See more FAQs

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.

Alternative routes for Seattle to District of Columbia

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Los Angeles flights
Seattle to Las Vegas flights
Seattle to Dallas/Fort Worth flights
Seattle to John F Kennedy Intl flights
Seattle to Sky Harbor Intl flights
Seattle to Honolulu flights
Seattle to Newark flights
Seattle to Ontario flights
Seattle to Hobby flights
Seattle to San Diego flights
Seattle to O'Hare Intl flights
Seattle to Kahului flights
Portland to Los Angeles flights
Seattle to Denver flights
Seattle to Orlando flights
Seattle to George Bush Intcntl flights
Seattle to Santa Ana flights
Portland to Las Vegas flights
Seattle to San Francisco flights
Seattle to Atlanta flights
Seattle to LaGuardia flights
Seattle to Miami flights
Seattle to Lihue flights
Seattle to Salt Lake City flights
Portland to John F Kennedy Intl flights
Seattle to Boston flights
Everett to Las Vegas flights
Seattle to Palm Springs flights
Seattle to Kailua-Kona flights
Seattle to Dulles Intl flights
Portland to Sky Harbor Intl flights
Seattle to Austin flights
Seattle to Minneapolis flights
Seattle to San Jose flights
Seattle to Tampa flights
Portland to Dallas/Fort Worth flights
Seattle to Fort Lauderdale flights
Portland to Newark flights
Everett to Sky Harbor Intl flights
Portland to Honolulu flights
Seattle to Reagan-National flights
Seattle to New Orleans flights
Portland to San Francisco flights
Portland to Kahului flights
Seattle to Raleigh flights
Everett to Los Angeles flights
Seattle to Nashville flights
Seattle to Tucson flights
Portland to Denver flights
Portland to San Diego flights

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 December 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$128Average$258FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$143Average$402FlexibilityNo cancel feeOn-time85%
FrontierCheapest$148Average$281FlexibilityNo cancel feeOn-time62%
DeltaCheapest$188Average$390FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$206Average$503FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$419FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$234Average$442FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$264Average$467FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

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.
Site
Cookie settings©2025 Cheapflights