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Cheap flights from Seattle to Washington, D.C. from C$ 219

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
14 Oct — 21 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in August or March, booked 60 days in advance, depart on a Thursday or Saturday and return on a Monday

Cheap flight deals from Seattle to Washington, D.C.

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Washington, D.C. (WAS). 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 14 September 2025.

Round-trip from

C$ 356

One-way from

C$ 219

Popular in

December

Cheapest in

August

Average price

C$ 577

Good round-trip deal

C$ 206 or less

Good one-way deal

C$ 588 or less
Alaska Airlines
  • Alaska Airlines
  • 5/1-22/1
  • Nonstop
  • 10h 59m total
  • Seattle to Washington, D.C.
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Hawaiian Airlines
  • Hawaiian Airlines
  • 10/1
  • 1 total stop
  • 8h 15m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 9% potential increase in price (C$ 83 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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Find flight deals from Seattle to Washington, D.C.

Cheapest flights from Seattle to Washington, D.C.
Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 September 2025.

Wed 12/111:52 p.m.SEA - DCA
Nonstop5h 07mAlaska Airlines
Tue 18/118:00 a.m.DCA - SEA
Nonstop6h 03mAlaska Airlines
Deal found 14/9C$ 356
Fri 10/104:48 p.m.SEA - IAD
Nonstop4h 52mDelta
Sun 9/117:15 a.m.IAD - SEA
Nonstop6h 04mDelta
Deal found 14/9C$ 356
Fri 31/105:20 a.m.SEA - DCA
1 stop7h 40mHawaiian Airlines
Sat 1/115:00 p.m.DCA - SEA
Nonstop6h 03mHawaiian Airlines
Deal found 14/9C$ 370
Thu 16/108:00 a.m.SEA - IAD
Nonstop5h 09mUnited Airlines
Sat 18/108:20 a.m.IAD - SEA
1 stop10h 25mUnited Airlines
Deal found 14/9C$ 370
Fri 31/105:20 p.m.SEA - IAD
1 stop9h 07mUnited Airlines
Sat 1/116:30 a.m.IAD - SEA
1 stop8h 15mUnited Airlines
Deal found 14/9C$ 375
Tue 9/127:20 a.m.SEA - DCA
1 stop10h 42mHawaiian Airlines
Thu 11/128:59 a.m.DCA - SEA
1 stop11h 22mHawaiian Airlines
Deal found 14/9C$ 382
Sat 8/118:49 a.m.SEA - DCA
Nonstop5h 04mHawaiian Airlines
Mon 10/118:00 a.m.DCA - SEA
Nonstop6h 03mHawaiian Airlines
Deal found 14/9C$ 383
Wed 8/104:20 p.m.SEA - IAD
Nonstop5h 03mHawaiian Airlines
Wed 15/106:25 a.m.IAD - SEA
Nonstop5h 43mHawaiian Airlines
Deal found 14/9C$ 383
Wed 12/116:35 a.m.SEA - DCA
1 stop8h 40mSouthwest
Tue 18/114:40 p.m.DCA - SEA
2 stops9h 15mSouthwest
Deal found 14/9C$ 390
Sat 15/115:00 a.m.SEA - DCA
2 stops10h 25mSouthwest
Sun 23/114:50 p.m.DCA - SEA
1 stop10h 40mSouthwest
Deal found 13/9C$ 393
Wed 29/105:20 a.m.SEA - DCA
1 stop7h 40mHawaiian Airlines
Fri 31/105:00 p.m.DCA - SEA
Nonstop6h 03mHawaiian Airlines
Deal found 14/9C$ 397
Wed 19/1110:29 p.m.SEA - IAD
Nonstop4h 54mAlaska Airlines
Sun 23/116:17 p.m.IAD - SEA
1 stop18h 11mAlaska Airlines
Deal found 13/9C$ 397

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Washington, D.C. 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 629,999 searches. Data last updated 14 September 2025.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Seattle

Fly to

Washington, D.C.

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 5/1

1:55 p.m.-9:59 p.m.

Nonstop5h 04m

Washington, D.C. Reagan-National

Tue 20/1

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 11/10

4:48 p.m.-12:40 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Tue 14/10

7:35 a.m.-10:28 a.m.

Nonstop5h 53m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/1

1:45 p.m.-9:55 p.m.

Nonstop5h 10m

Washington, D.C. Reagan-National

Wed 21/1

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 14/10

4:48 p.m.-12:40 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Tue 21/10

7:35 a.m.-10:28 a.m.

Nonstop5h 53m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 8/1

8:00 a.m.-4:15 p.m.

Nonstop5h 15m

Washington, D.C. Reagan-National

Thu 22/1

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 23/10

4:48 p.m.-12:40 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Sun 9/11

7:15 a.m.-10:19 a.m.

Nonstop6h 04m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 5/1

1:55 p.m.-9:59 p.m.

Nonstop5h 04m

Washington, D.C. Reagan-National

Mon 19/1

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 10/10

4:48 p.m.-12:40 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Sat 18/10

7:35 a.m.-10:28 a.m.

Nonstop5h 53m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 10/1

1:45 p.m.-9:55 p.m.

Nonstop5h 10m

Washington, D.C. Reagan-National

Sun 18/1

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 7/2

3:15 p.m.-11:16 p.m.

Nonstop5h 01m

Washington, D.C. Dulles Intl

Wed 18/2

7:00 a.m.-10:04 a.m.

Nonstop6h 04m

C$ 356

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/9

Showing 1-10 of 45 results
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Best time to book a flight from Seattle to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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 Washington, D.C.

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Washington, D.C.. Price data was last updated on 12 September 2025.

Booking 60 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Seattle to Washington, D.C.?

Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 256). Flying from Seattle to Washington, D.C. in October is currently the most expensive (average of C$ 352). 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 WAS?

Find hourly flight availability from Seattle to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 14 September 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 75% on flights from Seattle to Washington, D.C. by exploring options for tickets in the evening.

What is the cheapest day to fly from Seattle to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Washington, D.C.. Price data was last updated on 7 September 2025.

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Thursday evenings 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 Washington, D.C.

Explore weekly flight availability from Seattle to Washington, D.C.. 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 14 September 2025.

The most flights from SEA to WAS are scheduled on a Saturday (36 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (20 on average).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated 14 September 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Delta and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,956 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,956 reviews
Delta
8.0
Very good
7,956 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
5.8
Fair
3,173 reviews
Delta
8.0
Very good
7,956 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Seattle to Washington, D.C.. 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 Washington, D.C.?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Washington, D.C.. You should not have trouble finding flights to Washington, D.C. from Seattle/Tacoma Intl; the airport handles an average of 31 outbound flights to Washington, D.C. per day. You should also have plenty of airline options to choose from since 2 airlines have flights from the Seattle airport to Washington, D.C.. It is only a 18.4 km journey to Seattle/Tacoma Intl (SEA) from Seattle’s city centre.

  • How long is the flight from Seattle to Washington, D.C.?

    Alaska Airlines, Delta, and Hawaiian Airlines can get you from Seattle to Washington, D.C. in just under 4h 52m. Your travel time will be generally consistent. The distance between Seattle and Washington, D.C. is about 3700 km. All flights are typically direct.

  • What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

    Currently priced at C$ 264, Alaska Airlines will fly you from Seattle to Washington, D.C. and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Hawaiian Airlines for as low as C$ 363. These flights start at 52% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?

    For one-way options, check prices for Hawaiian Airlines. According to our data, you can fly for as low as C$ 219. Users have also found prices from C$ 220 and C$ 227 on United Airlines and Southwest, respectively.

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

    Before booking your flight to Washington, D.C. from Seattle, check out the most reliable airlines to get you to your destination on time: Austrian Airlines (87%), Brussels Airlines (87%), Lufthansa( 83%).

  • What are the cheapest flights from Seattle to Washington, D.C.?

    Looking for the cheapest flight from Seattle to Washington, D.C.? While on average our users pay C$ 887, our data indicates the cheapest price to be C$ 363. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), is priced around C$ 356.

  • Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Seattle to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Washington, D.C.?

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

  • Can I find deals for business class flights from Seattle to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Seattle to Washington, D.C. 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 Washington, D.C.?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 256). Flying from Seattle to Washington, D.C. in October is currently the most expensive (average of C$ 352). 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

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Herndon
Hanover
Reston
Fairfax
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Alexandria
Manassas
Fredericksburg
Rockville

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Alternative routes for Seattle to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Dulles Intl flights
Seattle to Reagan-National flights

Top 2 airlines flying from Seattle to Washington, D.C.

Discover the top 2 airlines that operate flights from Seattle to Washington, D.C.. 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 629,999 searches. Data last updated 14 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 236AverageC$ 468FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 363AverageC$ 363FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Washington, D.C.?

When you search for this flight from Seattle to Washington, D.C., Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Washington, D.C.?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Washington, D.C. for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?

Yes, we can. To see specific flights from Seattle to Washington, D.C. with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Washington, D.C. become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Washington, D.C. flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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