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Cheap flights from Seattle to Washington, D.C. from £118

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 14/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
22 Jan — 29 Jan1
1 adult

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 17 January 2025.

Round-trip from

£235

One-way from

£118

Popular in

December

Cheapest in

September

Average price

£335
Alaska Airlines
  • Alaska Airlines
  • 28/2-3/3
  • Nonstop
  • 10h 48m total
  • Seattle to Washington, D.C.
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Delta
  • Delta
  • 14/3
  • Nonstop
  • 5h 06m total
  • Seattle to Washington, D.C.
Search Deals
High demand for flights, 7% potential price rise
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Best time to find cheap flights, 2% potential price drop
Search Deals
Average for round-trip flights in January 2025
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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 17 January 2025.

Fri 28/221:40SEA - IAD
Nonstop4h 52mAlaska Airlines
Mon 3/307:00IAD - SEA
Nonstop5h 56mAlaska Airlines
Deal found 17/1£235
Wed 5/207:00SEA - IAD
1 stop10h 40mUnited Airlines
Sun 9/217:30IAD - SEA
Nonstop6h 01mUnited Airlines
Deal found 15/1£236
Mon 17/300:49SEA - IAD
1 stop19h 38mDelta
Tue 8/407:30IAD - SEA
Nonstop6h 07mDelta
Deal found 16/1£238
Tue 11/223:17SEA - DCA
1 stop8h 14mUnited Airlines
Wed 12/215:30DCA - SEA
1 stop10h 23mUnited Airlines
Deal found 16/1£239
Wed 24/913:45SEA - DCA
Nonstop5h 10mAlaska Airlines
Sat 27/917:30DCA - SEA
Nonstop5h 55mAlaska Airlines
Deal found 16/1£243
Fri 21/200:25SEA - DCA
1 stop8h 34mAmerican Airlines
Wed 26/205:00DCA - SEA
1 stop9h 04mAmerican Airlines
Deal found 16/1£244
Sat 8/209:45SEA - IAD
1 stop9h 56mAmerican Airlines
Sat 15/217:13IAD - SEA
1 stop9h 10mAmerican Airlines
Deal found 16/1£244
Sat 22/206:15SEA - DCA
1 stop14h 05mDelta
Wed 26/206:05DCA - SEA
1 stop13h 49mDelta
Deal found 16/1£250
Mon 24/223:48SEA - DCA
1 stop8h 56mJetBlue
Mon 3/315:50DCA - SEA
1 stop9h 48mJetBlue
Deal found 17/1£254
Sat 22/213:36SEA - DCA
1 stop19h 27mMultiple Airlines
Wed 26/208:00DCA - SEA
Nonstop6h 06mMultiple Airlines
Deal found 16/1£269
Thu 20/205:05SEA - DCA
2 stops10h 35mSouthwest
Wed 26/206:55DCA - SEA
1 stop7h 55mSouthwest
Deal found 16/1£272
Tue 1/718:40SEA - IAD
1 stop14h 03mSun Country Air
Sun 6/712:40IAD - SEA
1 stop22h 22mSun Country Air
Deal found 16/1£340

Find flights from Seattle to Washington, D.C. within your budget

Customise 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 858,174 searches. Data last updated 17 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 28/2

21:40-05:32

Nonstop4h 52m

Washington, D.C. Dulles Intl

Mon 3/3

07:00-09:56

Nonstop5h 56m

£235

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 5/2

07:00-20:40

1 stop10h 40m

Washington, D.C. Dulles Intl

Sun 9/2

17:30-20:31

Nonstop6h 01m

£236

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 17/3

00:49-23:27

1 stop19h 38m

Washington, D.C. Dulles Intl

Tue 8/4

07:30-10:37

Nonstop6h 07m

£238

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 11/2

23:17-10:31

1 stop8h 14m

Washington, D.C. Reagan-National

Wed 12/2

15:30-22:53

1 stop10h 23m

£239

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 21/2

00:25-11:59

1 stop8h 34m

Washington, D.C. Reagan-National

Wed 26/2

05:00-11:04

1 stop9h 04m

£244

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 8/2

09:45-22:41

1 stop9h 56m

Washington, D.C. Dulles Intl

Sat 15/2

17:13-23:23

1 stop9h 10m

£244

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 22/2

06:15-23:20

1 stop14h 05m

Washington, D.C. Reagan-National

Wed 26/2

06:05-16:54

1 stop13h 49m

£250

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 24/2

23:48-11:44

1 stop8h 56m

Washington, D.C. Reagan-National

Mon 3/3

15:50-22:38

1 stop9h 48m

£254

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 25/2

14:05-21:59

Nonstop4h 54m

Washington, D.C. Reagan-National

Tue 4/3

08:00-11:06

Nonstop6h 06m

£259

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 22/2

13:36-12:03

1 stop19h 27m

Washington, D.C. Reagan-National

Wed 26/2

08:00-11:06

Nonstop6h 06m

£269

Flights are sorted by cheapest return flights first.

Deals found on 17/1

Showing 1-10 of 23 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 return 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.

Travel insights for flights from Seattle to Washington, D.C.

Get recent, data-driven insights about flights from Seattle to Washington, D.C. including ideal travel times, pricing trends, and more.

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 return flight from Seattle to Washington, D.C.. Price data was last updated on 10 January 2025.

To ensure you get the cheapest price possible for a flight from Seattle to Washington, D.C., you should look to book at least 65 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 £565). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £946). 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 17 January 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Washington, D.C. as you normally would.

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 17 January 2025.

The most flights from SEA to WAS 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 (14 on average).

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. when rainfall is around 66.0 mm.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C., use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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 17 January 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Alaska Airlines, United Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very Good
4,659 reviews
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very Good
9,684 reviews
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very Good
8,513 reviews
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

JetBlue
7.4
Good
3,199 reviews
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,969 reviews
Southwest
8.1
Very Good
4,659 reviews
Check prices

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Washington, D.C. from Seattle. Booking flights from Seattle/Tacoma Intl (SEA) to Washington, D.C. should be relatively easy as there are 18 daily outbound flights to Washington, D.C. from 0 different airlines.

  • How popular is this Seattle to Washington, D.C. flight route?

    Flights from Seattle/Tacoma Intl to Washington, D.C. have been viewed 2 times in the past calendar month.

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

    Flying on Alaska Airlines is currently your cheapest option to Washington, D.C., with prices starting at £235. Additional return tickets that might be worth considering are offered by United Airlines and Delta, with the lowest prices starting at £236 and £238, respectively. Alaska Airlines is 29% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapet airlines for a one-way flight from Seattle to Washington, D.C. are Delta (£118), Alaska Airlines (£118), and United Airlines (£122).

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

    Consider Alaska Airlines (90%), Hawaiian Airlines (89%) or Air Tahiti Nui (85%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Washington, D.C..

  • 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 holiday 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 £565). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £946). 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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Need flexible booking options for your flight to Washington, D.C. from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Washington, D.C. from Seattle today and book when prices fit your budget.

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