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

A quick flight from Seattle to Washington, D.C. can take about 4h 56m. Alaska Airlines provides one of the quickest options available for as low as $367. The distance between Seattle and Washington, D.C. is about 2299 mi. This flight may include one or multiple stops.

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

Our cheapest airline available from Seattle to Washington, D.C. is Delta. Our recent data shows that you can find tickets from as low as $147 on this airline. Additional options worth looking into are Frontier and American Airlines, starting at $181 and $196 round-trip. Delta is currently priced 65% below the average price you’ll pay for this route.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Seattle to Washington, D.C. for a low price.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the most popular routes from Seattle to Washington, D.C.?

The most popular flight routes from Seattle to Washington, D.C. are Seattle/Tacoma Intl - Washington, D.C. Dulles Intl, Seattle/Tacoma Intl - Washington, D.C. Reagan-National and Seattle/Tacoma Intl - Baltimore/Washington.

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

While on average a flight from Seattle to Washington, D.C. is generally $1,436, our data shows the cheapest flight currently is $162. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $240 for that flight.

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

No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. consider choosing Qatar Airways (93%), Iberia (91%) or Austrian Airlines (90%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Seattle to Washington, D.C.?

Alaska Airlines, Delta and United Airlines are the most popular airlines when flying from Seattle to Washington, D.C..

Most accurate provider : When it comes to deals on Seattle-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Washington, D.C. flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Seattle to Washington, D.C.?

Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Washington, D.C.. 6 airlines have flights from Seattle/Tacoma Intl to Washington, D.C. on a regular basis. Booking flights from Seattle/Tacoma Intl to Washington, D.C. should not be difficult; the airport handles an average of 15 outbound flights to Washington, D.C. per day.

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.

$130+ Cheap Flights from Seattle to Washington, D.C.

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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in January or February, booked 85 days in advance, depart on a Thursday or Friday and return on a Wednesday

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

Cheapest

Best

Last-minute

One-way

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 September 12, 2026.

Wed 11/114:27 pm -

1 stop16h 42m

Mon 11/167:00 am -

1 stop11h 12m

Deal found 9/10

$290

Wed 10/284:27 pm -

1 stop16h 42m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/9

$292

Wed 10/214:27 pm -

1 stop26h 32m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/10

$295

Sat 10/171:49 pm -

Nonstop5h 10m

Sat 10/317:00 am -

1 stop11h 12m

Deal found 9/8

$296

Mon 10/129:16 pm -

2 stops16h 57m

Mon 10/199:06 pm -

2 stops21h 06m

Deal found 9/11

$297

Wed 9/309:45 pm -

1 stop29h 35m

Tue 10/66:00 am -

1 stop30h 42m

Deal found 9/9

$298

Fri 10/234:27 pm -

1 stop16h 37m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/10

$300

Thu 10/19:45 pm -

1 stop29h 35m

Mon 10/56:00 am -

1 stop30h 42m

Deal found 9/10

$301

Sat 10/310:53 am -

2 stops16h 27m

Wed 10/76:00 am -

1 stop29h 58m

Deal found 9/10

$302

Thu 10/19:45 pm -

1 stop29h 35m

Wed 10/76:00 am -

1 stop29h 58m

Deal found 9/9

$305

Mon 10/1211:14 pm -

Nonstop5h 03m

Fri 10/165:20 pm -

1 stop8h 36m

Deal found 9/7

$307

Fri 11/131:57 pm -

Nonstop5h 02m

Wed 11/187:00 am -

1 stop11h 12m

Deal found 9/8

$308

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 layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.

Sun 10/119:36 pm -

Nonstop5h 04m

Wed 10/217:02 am -

Nonstop5h 42m

Deal found 9/7

$347

Wed 2/173:55 pm -

Nonstop4h 56m

Sun 2/217:05 am -

Nonstop6h 00m

Deal found 9/7

$367

Sat 11/148:09 am -

Nonstop4h 59m

Mon 11/235:30 pm -

1 stop8h 37m

Deal found 9/9

$387

Tue 12/85:40 am -

2 stops9h 15m

Sat 12/1212:15 pm -

2 stops12h 35m

Deal found 9/8

$407

Fri 10/93:56 pm -

Nonstop5h 03m

Tue 10/207:02 am -

Nonstop5h 42m

Deal found 9/7

$347

Fri 10/92:50 pm -

Nonstop4h 59m

Tue 10/207:05 am -

Nonstop5h 51m

Deal found 9/9

$377

Wed 12/98:30 am -

1 stop8h 00m

Mon 12/145:45 pm -

Nonstop5h 35m

Deal found 9/10

$387

Sat 10/318:15 am -

Nonstop5h 15m

Mon 11/95:17 pm -

Nonstop5h 56m

Deal found 9/8

$373

Thu 10/2212:10 am -

1 stop10h 50m

Mon 10/265:05 pm -

2 stops10h 35m

Deal found 9/8

$428

Fri 10/97:20 am -

Nonstop5h 03m

Wed 10/214:45 pm -

Nonstop5h 50m

Deal found 9/9

$402

Sun 10/119:36 pm -

Nonstop5h 04m

Thu 10/227:02 am -

Nonstop5h 42m

Deal found 9/11

$377

Sat 10/316:50 am -

1 stop8h 35m

Mon 11/92:40 pm -

2 stops11h 20m

Deal found 9/8

$432

Thu 10/226:00 am -

1 stop14h 07m

Tue 10/274:45 pm -

Nonstop5h 50m

Deal found 9/10

$405

Wed 11/47:46 pm -

1 stop18h 54m

Tue 11/105:17 pm -

Nonstop5h 56m

Deal found 9/9

$387

Fri 10/2310:35 pm -

1 stop8h 22m

Mon 10/266:10 am -

1 stop18h 55m

Deal found 9/10

$410

Fri 10/912:10 am -

2 stops9h 35m

Sat 10/176:20 am -

2 stops10h 35m

Deal found 9/7

$452

Fri 10/239:08 pm -

1 stop17h 42m

Mon 10/267:02 am -

Nonstop5h 42m

Deal found 9/10

$391

Fri 10/912:10 am -

2 stops9h 35m

Wed 10/216:15 am -

2 stops10h 20m

Deal found 9/7

$452

Thu 10/2211:50 pm -

2 stops13h 38m

Tue 10/2710:57 am -

1 stop10h 38m

Deal found 9/10

$422

Tue 10/278:00 am -

Nonstop5h 25m

Tue 11/38:00 am -

Nonstop5h 55m

Deal found 9/11

$397

Mon 10/127:55 pm -

1 stop6h 50m

Sat 10/179:00 am -

1 stop10h 16m

Deal found 9/10

$427

Sun 10/119:15 pm -

1 stop10h 05m

Sat 10/1712:55 pm -

1 stop10h 35m

Deal found 9/11

$472

Wed 10/211:49 pm -

Nonstop5h 10m

Tue 11/38:00 am -

Nonstop5h 55m

Deal found 9/11

$397

Tue 10/65:35 am -

2 stops11h 25m

Fri 10/96:15 pm -

1 stop10h 25m

Deal found 9/11

$487

Fri 10/237:20 am -

Nonstop5h 03m

Fri 11/64:45 pm -

Nonstop5h 50m

Deal found 9/11

$447

Thu 10/229:18 pm -

Nonstop5h 02m

Tue 11/37:02 am -

Nonstop5h 54m

Deal found 9/8

$407

Wed 9/3010:23 pm -

Nonstop5h 07m

Tue 10/136:15 pm -

Nonstop5h 45m

Deal found 9/8

$407

Sun 10/117:20 am -

Nonstop5h 03m

Thu 10/2212:26 pm -

1 stop9h 38m

Deal found 9/10

$472

Fri 11/202:00 pm -

Nonstop4h 59m

Mon 11/235:00 pm -

Nonstop6h 05m

Deal found 9/8

$427

Thu 12/178:30 am -

Nonstop4h 58m

Mon 1/115:30 pm -

Nonstop6h 03m

Deal found 9/11

$427

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated September 12, 2026 and is based on user searches.

Wed 9/309:45 pm -

1 stop29h 35m

Tue 10/66:00 am -

1 stop30h 42m

Deal found 9/9

$298

Thu 10/19:45 pm -

1 stop29h 35m

Mon 10/56:00 am -

1 stop30h 42m

Deal found 9/10

$301

Thu 10/19:45 pm -

1 stop29h 35m

Wed 10/76:00 am -

1 stop29h 58m

Deal found 9/9

$305

Sat 10/310:53 am -

2 stops16h 27m

Wed 10/76:00 am -

1 stop29h 58m

Deal found 9/10

$302

Mon 10/129:16 pm -

2 stops16h 57m

Mon 10/199:06 pm -

2 stops21h 06m

Deal found 9/11

$297

Mon 10/1211:14 pm -

Nonstop5h 03m

Fri 10/165:20 pm -

1 stop8h 36m

Deal found 9/7

$307

Tue 10/133:56 pm -

Nonstop5h 03m

Tue 10/207:24 pm -

1 stop17h 04m

Deal found 9/7

$309

Sat 10/171:49 pm -

Nonstop5h 10m

Sat 10/317:00 am -

1 stop11h 12m

Deal found 9/8

$296

Wed 10/214:27 pm -

1 stop26h 32m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/10

$295

Fri 10/234:27 pm -

1 stop16h 37m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/10

$300

Sun 10/258:09 am -

Nonstop4h 59m

Tue 11/35:50 pm -

Nonstop6h 06m

Deal found 9/7

$311

Wed 10/284:27 pm -

1 stop16h 42m

Thu 10/296:00 pm -

1 stop24h 12m

Deal found 9/9

$292

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 September 12, 2026.

Mon 10/194:27 pm -

2 stops38h 00m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/9

$130

Tue 10/64:27 pm -

2 stops38h 00m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$133

Fri 10/304:27 pm -

2 stops28h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/7

$136

Mon 11/169:13 pm -

2 stops34h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/9

$140

Mon 11/94:27 pm -

2 stops28h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/11

$149

Mon 11/24:27 pm -

2 stops28h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/10

$152

Tue 10/204:27 pm -

2 stops42h 42m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/9

$154

Fri 10/29:45 pm -

2 stops20h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/11

$157

Tue 11/1012:14 pm -

2 stops18h 36m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/8

$159

Thu 11/58:09 pm -

2 stops22h 41m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/9

$175

Wed 9/304:27 pm -

1 stop16h 44m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/10

$176

Wed 9/307:25 pm -

2 stops13h 08m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/9

$176

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$290 (Kiwi.com)
One-way from	$130 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$378
Good round-trip deal	$384 or less
Good one-way deal	$251 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 Washington, D.C. (WAS)

Search Deals

One-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS)

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($60 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 September 2026

Search Deals

Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).

Search Deals

Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - DCA Washington, D.C. Reagan-National

SEADCA

Seattle/Tacoma Intl

Sat 10/17

12:10 am-12:15 pm

1 stop9h 05m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$189

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - DCA Washington, D.C. Reagan-National

SEADCA

Seattle/Tacoma Intl

Sat 10/31

6:15 am-6:40 pm

2 stops9h 25m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$194

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Tue 12/1

10:20 pm-6:21 am

Nonstop5h 01m

Baltimore/Washington

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$199

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Tue 12/1

3:59 pm-11:59 pm

Nonstop5h 00m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$199

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Sat 10/10

10:35 pm-9:16 am

1 stop7h 41m

Baltimore/Washington

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Wed 10/28

8:09 am-4:08 pm

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

Quickest round-trip

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Mon 2/22

3:55 pm-11:51 pm

Nonstop4h 56m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Sat 11/14

10:40 am-11:40 pm

1 stop10h 00m

Baltimore/Washington

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - DCA Washington, D.C. Reagan-National

SEADCA

Seattle/Tacoma Intl

Sat 10/10

1:49 pm-9:59 pm

Nonstop5h 10m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Fri 10/23

2:50 pm-10:49 pm

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/7

Showing 1-10 of 60 resultsSorted by cheapest first

...

Compare providers for flights from Seattle to Washington, D.C.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Washington, D.C. in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy1 star	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Washington, D.C. flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

SEA-WAS

SEA-DCA

SEA-IAD

SEA-BWI

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.

SEA-WAS

SEA-DCA

SEA-IAD

SEA-BWI

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $329). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of $525). 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?

When flying from Seattle to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 26% versus a flight at noon.

Weekly flight availability from Seattle to Washington, D.C.

The most flights from SEA to WAS are scheduled on a Friday (25 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Seattle to Washington, D.C.?

Airfare is below average for this route at the moment.

Seattle to Washington, D.C. flights typically cost between $325 and $531 in November.
The cheapest round-trip price found within the last 5 days was $290 on Frontier (Nov 11-Nov 16).

What’s the top layover airport for flights from Seattle to Washington, D.C.?

San Diego (SAN) – chosen by Cheapflights users on 50% of 1-stop itineraries from Seattle to Washington, D.C. on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to Washington, D.C.?

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $294.

What’s the fastest layover option from Seattle to Washington, D.C.?

Flights via San Diego (SAN) have the shortest average one-way travel time for 1-stop routes: 9h 27m.

Which airport typically offers the quickest layover for flights from Seattle to Washington, D.C.?

Flights via San Diego (SAN) offer the fastest connection on this route, with an average layover time of 4h 41m.

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

The price you pay for your flight from Seattle to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 36 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Seattle to Washington, D.C. flights

Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Washington, D.C. trip

Our travel experts

Robert Schrader

Expert on Alaska Airlines

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Emily Zemler

Expert on DCA

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Ramsey Qubein

Expert on IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Seattle to Washington, D.C.. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Alaska Airlines

7.9

Good

12,917 reviews

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Delta

7.8

Good

8,563 reviews

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

United Airlines

7.4

Good

10,206 reviews

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

American Airlines

7.1

Good

12,050 reviews

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Frontier

5.6

Fair

2,607 reviews

Alaska Airlines

7.9

Good

12,917 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

What airport do you fly from for flights from Seattle to Washington, D.C.?
Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Washington, D.C.. 6 airlines have flights from Seattle/Tacoma Intl to Washington, D.C. on a regular basis. Booking flights from Seattle/Tacoma Intl to Washington, D.C. should not be difficult; the airport handles an average of 15 outbound flights to Washington, D.C. per day.
How long is the flight from Seattle to Washington, D.C.?
A quick flight from Seattle to Washington, D.C. can take about 4h 56m. Alaska Airlines provides one of the quickest options available for as low as $367. The distance between Seattle and Washington, D.C. is about 2299 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?
Our cheapest airline available from Seattle to Washington, D.C. is Delta. Our recent data shows that you can find tickets from as low as $147 on this airline. Additional options worth looking into are Frontier and American Airlines, starting at $181 and $196 round-trip. Delta is currently priced 65% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Seattle to Washington, D.C. for a low price.
What are the most popular routes from Seattle to Washington, D.C.?
The most popular flight routes from Seattle to Washington, D.C. are Seattle/Tacoma Intl - Washington, D.C. Dulles Intl, Seattle/Tacoma Intl - Washington, D.C. Reagan-National and Seattle/Tacoma Intl - Baltimore/Washington.
What are the most reliable airlines from Seattle to Washington, D.C.?
No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. consider choosing Qatar Airways (93%), Iberia (91%) or Austrian Airlines (90%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Seattle to Washington, D.C.?
While on average a flight from Seattle to Washington, D.C. is generally $1,436, our data shows the cheapest flight currently is $162. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $240 for that flight.
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, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $329). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of $525). 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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Top 6 airlines flying from Seattle to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$98	Average$351	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$178	Average$523	FlexibilityNo cancel fee	On-time71%
Frontier	Cheapest$181	Average$323	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$187	Average$464	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$211	Average$483	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$226	Average$467	FlexibilityNo cancel fee	On-time69%

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$130+ Cheap flights from Seattle (SEA) to Washington, D.C. (WAS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/19. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap 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 September 12, 2026.

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 September 12, 2026.

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 layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.

Discover carefully curated flight deals from Seattle to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.

Last-minute flights from Seattle to Washington, D.C.Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated September 12, 2026 and is based on user searches.

Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated September 12, 2026 and is based on user searches.

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 September 12, 2026.

Search for one-way flight options from Seattle to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.

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

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Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Compare providers for flights from Seattle to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Washington, D.C. in September.

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.

Cheapflights Insights

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

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 September 12, 2026.

When flying from Seattle to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 26% versus a flight at noon.

Weekly flight availability from Seattle to Washington, D.C.

The most flights from SEA to WAS are scheduled on a Friday (25 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Seattle to Washington, D.C.?

Airfare is below average for this route at the moment.

Seattle to Washington, D.C. flights typically cost between $325 and $531 in November.The cheapest round-trip price found within the last 5 days was $290 on Frontier (Nov 11-Nov 16).

What’s the top layover airport for flights from Seattle to Washington, D.C.?

Share of 1-stop round-trip flights from Seattle to Washington, D.C. chosen by Cheapflights users in the past 12 months, using the same layover each way.

San Diego (SAN) – chosen by Cheapflights users on 50% of 1-stop itineraries from Seattle to Washington, D.C. on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to Washington, D.C.?

Average round-trip fare for 1-stop flights from Seattle to Washington, D.C., chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $294.

What’s the fastest layover option from Seattle to Washington, D.C.?

Shortest average travel time for 1-stop one-way flights from Seattle to Washington, D.C., based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via San Diego (SAN) have the shortest average one-way travel time for 1-stop routes: 9h 27m.

Which airport typically offers the quickest layover for flights from Seattle to Washington, D.C.?

Average layover duration for 1-stop one-way flights from Seattle to Washington, D.C., chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via San Diego (SAN) offer the fastest connection on this route, with an average layover time of 4h 41m.

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

The price you pay for your flight from Seattle to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 36 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 September 5, 2026.

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Seattle to Washington, D.C. flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Washington, D.C. trip

Our travel experts

Reviews of airlines servicing Washington, D.C.

Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Seattle to Washington, D.C.. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Seattle to Washington, D.C.?

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

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

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

What are the most popular routes from Seattle to Washington, D.C.?

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

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

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

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

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

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

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

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.

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 September 12, 2026.

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 layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated September 12, 2026 and is based on user searches.

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 September 12, 2026.

Seattle to Washington, D.C. flights typically cost between $325 and $531 in November.
The cheapest round-trip price found within the last 5 days was $290 on Frontier (Nov 11-Nov 16).