Cheap flights from Seattle to Washington, D.C. from £88
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 31/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
25 Feb — 4 Mar1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in July or August, booked 81 days in advance, depart on a Tuesday or Monday and return on a Tuesday
Cheap flight deals from Seattle to Washington, D.C.
Enter your travel dates to find the best prices.
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 26 January 2026.
Sat 21/215:40
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£146
Tue 31/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 14/407:00
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 24/1£160
Mon 9/306:15
SEA
-
DCA
1 stop7h 40m
Southwest
Thu 12/307:25
DCA
-
SEA
1 stop8h 15m
Southwest
Deal found 23/1£160
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Sat 28/216:44
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 23/1£168
Tue 28/415:55
SEA
-
IAD
Nonstop5h 14m
Alaska Airlines
Tue 5/507:10
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Deal found 24/1£174
Thu 9/410:09
SEA
-
IAD
Nonstop5h 02m
Alaska Airlines
Wed 15/407:00
IAD
-
SEA
Nonstop5h 53m
Alaska Airlines
Deal found 23/1£174
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Tue 24/207:35
DCA
-
SEA
1 stop10h 19m
Delta
Deal found 24/1£175
Mon 23/212:43
SEA
-
IAD
1 stop7h 38m
United Airlines
Mon 2/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 25/1£178
Sat 21/208:17
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sat 28/214:12
IAD
-
SEA
1 stop10h 00m
United Airlines
Deal found 25/1£181
Mon 2/321:45
SEA
-
IAD
Nonstop4h 55m
Alaska Airlines
Sun 8/307:05
IAD
-
SEA
Nonstop6h 00m
Alaska Airlines
Deal found 23/1£182
Mon 9/317:20
SEA
-
IAD
1 stop9h 16m
United Airlines
Thu 12/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 23/1£182
Mon 23/223:35
SEA
-
DCA
1 stop7h 54m
United Airlines
Mon 2/317:50
DCA
-
SEA
1 stop10h 09m
United Airlines
Deal found 25/1£188
Best flights from Seattle to Washington, D.C.
Discover carefully curated flight deals from Seattle to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 26 January 2026.
Tue 31/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 14/407:00
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 24/1£160
Tue 21/421:40
SEA
-
IAD
Nonstop5h 00m
Alaska Airlines
Fri 1/507:10
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Deal found 25/1£174
Tue 7/414:24
SEA
-
IAD
1 stop6h 51m
United Airlines
Wed 22/417:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 24/1£181
Tue 7/406:00
SEA
-
DCA
2 stops9h 40m
Southwest
Wed 22/419:00
DCA
-
SEA
1 stop8h 10m
Southwest
Deal found 24/1£232
Tue 28/415:55
SEA
-
IAD
Nonstop5h 14m
Alaska Airlines
Tue 5/507:10
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Deal found 24/1£174
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Tue 24/207:35
DCA
-
SEA
1 stop10h 19m
Delta
Deal found 24/1£175
Fri 24/411:58
SEA
-
IAD
1 stop8h 27m
United Airlines
Mon 27/417:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 25/1£181
Sat 21/206:10
SEA
-
IAD
1 stop9h 44m
Delta
Tue 24/217:13
IAD
-
SEA
1 stop7h 52m
Delta
Deal found 24/1£175
Thu 23/414:24
SEA
-
IAD
1 stop6h 51m
United Airlines
Mon 27/417:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 24/1£181
Mon 23/223:35
SEA
-
DCA
1 stop7h 54m
United Airlines
Mon 2/317:50
DCA
-
SEA
1 stop10h 09m
United Airlines
Deal found 25/1£188
Fri 1/513:43
SEA
-
DCA
Nonstop5h 16m
Alaska Airlines
Tue 5/508:59
DCA
-
SEA
1 stop10h 11m
Alaska Airlines
Deal found 24/1£210
Sat 2/507:30
SEA
-
DCA
1 stop10h 20m
Southwest
Sun 10/506:10
DCA
-
SEA
2 stops17h 35m
Southwest
Deal found 24/1£237
Tue 7/423:59
SEA
-
DCA
1 stop8h 00m
United Airlines
Wed 22/411:55
DCA
-
SEA
1 stop7h 42m
United Airlines
Deal found 24/1£188
Fri 20/207:20
SEA
-
DCA
Nonstop5h 00m
Delta
Mon 23/216:44
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£210
Wed 1/414:24
SEA
-
IAD
1 stop6h 51m
United Airlines
Tue 14/413:10
IAD
-
SEA
1 stop8h 50m
United Airlines
Deal found 25/1£188
Wed 8/413:53
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Tue 14/408:00
DCA
-
SEA
Nonstop6h 05m
Alaska Airlines
Deal found 23/1£229
Fri 17/407:30
SEA
-
DCA
Nonstop4h 57m
Delta
Mon 20/416:39
DCA
-
SEA
Nonstop5h 51m
Delta
Deal found 24/1£210
Tue 10/310:55
SEA
-
IAD
1 stop6h 42m
United Airlines
Tue 24/318:03
IAD
-
SEA
1 stop9h 56m
United Airlines
Deal found 24/1£188
Thu 19/313:53
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Sat 21/308:00
DCA
-
SEA
Nonstop6h 05m
Alaska Airlines
Deal found 25/1£229
Wed 1/407:25
SEA
-
DCA
Nonstop4h 58m
Delta
Tue 14/416:39
DCA
-
SEA
Nonstop5h 51m
Delta
Deal found 25/1£210
Mon 16/223:59
SEA
-
DCA
1 stop9h 00m
United Airlines
Mon 23/218:00
DCA
-
SEA
1 stop8h 51m
United Airlines
Deal found 25/1£221
Direct flights from Seattle to Washington, D.C.
Explore direct flight options from Seattle to Washington, D.C. based on user searches, and compare prices and availability for your desired travel dates. Data last updated 26 January 2026.
Sat 21/215:40
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£146
Tue 31/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 14/407:00
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 24/1£160
Tue 28/415:55
SEA
-
IAD
Nonstop5h 14m
Alaska Airlines
Tue 5/507:10
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Deal found 24/1£174
Thu 9/410:09
SEA
-
IAD
Nonstop5h 02m
Alaska Airlines
Wed 15/407:00
IAD
-
SEA
Nonstop5h 53m
Alaska Airlines
Deal found 23/1£174
Mon 9/308:00
SEA
-
IAD
Nonstop5h 02m
United Airlines
Thu 12/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 23/1£175
Thu 12/315:55
SEA
-
IAD
Nonstop4h 53m
Delta
Sun 15/307:00
IAD
-
SEA
Nonstop6h 03m
Delta
Deal found 24/1£178
Wed 13/515:53
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Wed 3/617:33
IAD
-
SEA
Nonstop5h 54m
Alaska Airlines
Deal found 24/1£181
Mon 2/321:45
SEA
-
IAD
Nonstop4h 55m
Alaska Airlines
Sun 8/307:05
IAD
-
SEA
Nonstop6h 00m
Alaska Airlines
Deal found 23/1£182
Sat 21/207:20
SEA
-
DCA
Nonstop5h 00m
Delta
Tue 24/216:44
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£185
Wed 18/310:09
SEA
-
IAD
Nonstop5h 02m
Alaska Airlines
Sat 21/318:50
IAD
-
SEA
Nonstop5h 55m
Alaska Airlines
Deal found 24/1£188
Wed 18/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Sun 22/307:00
IAD
-
SEA
Nonstop6h 03m
Delta
Deal found 24/1£192
Sun 22/215:20
SEA
-
IAD
Nonstop4h 50m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£193
Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated 26 January 2026 and is based on user searches.
Fri 20/210:55
SEA
-
IAD
1 stop7h 23m
United Airlines
Wed 25/217:10
IAD
-
SEA
1 stop8h 49m
United Airlines
Deal found 25/1£188
Sat 21/215:40
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£146
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Sat 28/216:44
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 23/1£168
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Tue 24/207:35
DCA
-
SEA
1 stop10h 19m
Delta
Deal found 24/1£175
Sat 21/208:17
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sat 28/214:12
IAD
-
SEA
1 stop10h 00m
United Airlines
Deal found 25/1£181
Sat 21/206:50
SEA
-
IAD
1 stop11h 55m
Southwest
Sat 28/216:30
IAD
-
SEA
1 stop9h 20m
Southwest
Deal found 24/1£192
Sat 21/215:40
SEA
-
IAD
Nonstop4h 54m
Delta
Sat 28/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 25/1£195
Sun 22/215:20
SEA
-
IAD
Nonstop4h 50m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£193
Mon 23/212:43
SEA
-
IAD
1 stop7h 38m
United Airlines
Mon 2/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 25/1£178
Mon 23/223:35
SEA
-
DCA
1 stop7h 54m
United Airlines
Mon 2/317:50
DCA
-
SEA
1 stop10h 09m
United Airlines
Deal found 25/1£188
Sat 28/208:17
SEA
-
IAD
Nonstop5h 02m
United Airlines
Fri 1/517:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 24/1£174
Sat 28/207:05
SEA
-
DCA
1 stop6h 35m
Southwest
Tue 3/315:25
DCA
-
SEA
2 stops10h 05m
Southwest
Deal found 23/1£200
One-way flights from Seattle to Washington, D.C.
Search for one-way flight options from Seattle to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 26 January 2026.
Tue 31/308:00
SEA
-
IAD
Nonstop5h 11m
United Airlines
Deal found 23/1£88
Tue 24/206:45
SEA
-
DCA
1 stop8h 35m
Southwest
Deal found 25/1£94
Sat 28/205:15
SEA
-
IAD
1 stop7h 30m
Southwest
Deal found 25/1£94
Sat 21/206:50
SEA
-
IAD
1 stop11h 55m
Southwest
Deal found 25/1£98
Thu 26/213:56
SEA
-
DCA
Nonstop5h 03m
Alaska Airlines
Deal found 25/1£102
Tue 24/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Deal found 24/1£102
Mon 9/306:15
SEA
-
DCA
2 stops13h 40m
Southwest
Deal found 25/1£103
Mon 2/312:43
SEA
-
IAD
1 stop7h 38m
United Airlines
Deal found 25/1£105
Mon 23/215:20
SEA
-
IAD
Nonstop4h 50m
Delta
Deal found 24/1£106
Mon 6/423:05
SEA
-
DCA
1 stop10h 25m
United Airlines
Deal found 25/1£109
Tue 17/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Deal found 25/1£109
Tue 24/323:15
SEA
-
DCA
1 stop6h 28m
Delta
Deal found 24/1£110
Find 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 26 January 2026.
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 26 January 2026.
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 - IAD
SEAIAD
Seattle/Tacoma Intl
Tue 31/3
15:55-23:49
Nonstop4h 54m
Washington, D.C. Dulles Intl
Tue 14/4
07:00-09:54
Nonstop5h 54m
£160
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Tue 21/4
21:40-05:40
Nonstop5h 00m
Washington, D.C. Dulles Intl
Fri 1/5
07:10-09:58
Nonstop5h 48m
£174
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Tue 28/4
15:55-00:09
Nonstop5h 14m
Washington, D.C. Dulles Intl
Tue 5/5
07:10-09:58
Nonstop5h 48m
£174
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Sat 21/2
23:10-08:53
1 stop6h 43m
Washington, D.C. Reagan-National
Tue 24/2
07:35-14:54
1 stop10h 19m
£175
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Sat 21/2
06:10-18:54
1 stop9h 44m
Washington, D.C. Dulles Intl
Tue 24/2
17:13-22:05
1 stop7h 52m
£175
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Tue 7/4
14:24-00:15
1 stop6h 51m
Washington, D.C. Dulles Intl
Wed 22/4
17:55-20:53
Nonstop5h 58m
£181
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Fri 24/4
11:58-23:25
1 stop8h 27m
Washington, D.C. Dulles Intl
Mon 27/4
17:55-20:53
Nonstop5h 58m
£181
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Thu 23/4
14:24-00:15
1 stop6h 51m
Washington, D.C. Dulles Intl
Mon 27/4
17:55-20:53
Nonstop5h 58m
£181
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Mon 23/2
23:35-10:29
1 stop7h 54m
Washington, D.C. Reagan-National
Mon 2/3
17:50-00:59
1 stop10h 09m
£188
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Tue 7/4
23:59-10:59
1 stop8h 00m
Washington, D.C. Reagan-National
Wed 22/4
11:55-16:37
1 stop7h 42m
£188
Flights are sorted by cheapest return flights first.
Deals found on 25/1
Showing 1-10 of 44 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.
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 return flight from Seattle to Washington, D.C.. Price data was last updated on 23 January 2026.
To ensure you get the cheapest price possible for a flight from Seattle to Washington, D.C., you should look to book at least 81 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £81). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £153). 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 26 January 2026.
One of the essential ways to save on airfare from Seattle to Washington, D.C. is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 29% on airfare.
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 26 January 2026.
The most flights from SEA to WAS are scheduled on a Monday (23 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 on average).
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 21 daily outbound flights to Washington, D.C. from 0 different airlines.
How long is the flight from Seattle to Washington, D.C.?
Delta, Alaska Airlines, and United Airlines can get you from Seattle to Washington, D.C. in just under 4h 54m. Your travel time can differ by up to 3h. Airlines will cover a distance of 2299 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most reliable airlines from Seattle to Washington, D.C.?
Consider Austrian Airlines (100%), Brussels Airlines (100%) or Avianca (98%) 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £81). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £153). 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.
Explore flights to Washington, D.C. departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 26 January 2026.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Seattle to Washington, D.C.?
Cheapflights helps you search for flights from Seattle to Washington, D.C. via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from Seattle to Washington, D.C.?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Washington, D.C..
Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?
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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