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

Flights from Seattle/Tacoma Intl to Washington, D.C. have been viewed 12 times in the past calendar month.

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 $227 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $251 and $252 round-trip. Delta is currently priced 42% 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 Delta, with whom users have recently found tickets for as low as $124. However, be on the lookout for offers from United Airlines and Spirit 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 - Baltimore/Washington and Seattle/Tacoma Intl - Washington, D.C. Reagan-National.

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

While on average a flight from Seattle to Washington, D.C. is generally $337, our data shows the cheapest flight currently is $138. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $271 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 Hawaiian Airlines (74%), Air Tahiti Nui (73%) or Alaska Airlines (61%) 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.?

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

Where are the most common layover locations when flying from Seattle to Washington, D.C.?

Flights departing from Seattle and landing in Washington, D.C. layover in Denver most frequently.

Where are the least popular layover locations for Seattle to Washington, D.C. flights?

Of the flights from Seattle to Washington, D.C. that have layovers, the fewest flights stop in Chicago.

What are some popular things to do or see while on a layover in Denver?

Coors Field, Paramount Theatre, and Larimer Square are the most popular attractions in Denver if you're in need of something to do during your layover. Coors Field, Paramount Theatre, and Larimer Square can be visited by traveling about 18.4 mi, 18.6 mi, and 18.9 mi respectively from Denver Intl. Those on a layover in Denver in need of a rental car can book one at Denver Intl for about $54.

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

Wednesday is generally a great day to depart. Flying on this day could help you save up to 27%.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 42 days in advance, which can save you up to 74% on flights from Seattle to Washington, D.C. compared to booking the week you need them. Waiting 42 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $354. For sooner than that we have options available in the next 3 days from $557.

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

September is one of the best times of the year to fly to Washington, D.C. from Seattle. Prices for September average $397 per person but you can even find prices for as low as $206. The most expensive prices can be found in the month of December. Opting for a September flight can save you 27% on your journey compared to booking in December

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.. 9 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 32 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.

$124+ Flights from Seattle to Washington, D.C.

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or March, booked 90 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

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

Round-trip from	$227 (Delta)
One-way from	$124 (Delta)
Popular in	December
Cheapest in	September
Average price	$457
Good round-trip deal	$317 or less
Good one-way deal	$178 or less

From Seattle/Tacoma Intl to Washington, D.C. (WAS)

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

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Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).

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Average for round-trip flights in June 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 June 12, 2025.

Wed 10/86:00 amSEA - BWI

1 stop6h 55mAmerican Airlines

Wed 10/156:49 amBWI - SEA

1 stop8h 04mAmerican Airlines

Deal found 6/10

$214

Wed 11/2612:40 amSEA - BWI

1 stop7h 11mDelta

Fri 12/56:15 pmBWI - SEA

1 stop8h 19mDelta

Deal found 6/10

$227

Wed 8/207:00 pmSEA - BWI

1 stop7h 21mUnited Airlines

Sun 8/246:15 amBWI - SEA

1 stop8h 16mUnited Airlines

Deal found 6/9

$251

Tue 7/13:58 pmSEA - BWI

1 stop10h 45mSpirit Airlines

Tue 7/86:00 amBWI - SEA

1 stop12h 03mSpirit Airlines

Deal found 6/10

$257

Tue 10/216:00 amSEA - DCA

1 stop8h 01mFrontier

Tue 10/286:00 pmDCA - SEA

1 stop8h 02mFrontier

Deal found 6/10

$257

Mon 9/86:00 amSEA - BWI

1 stop9h 04mMultiple Airlines

Wed 9/178:00 amBWI - SEA

1 stop10h 53mMultiple Airlines

Deal found 6/10

$265

Tue 8/1912:45 amSEA - DCA

1 stop7h 15mAmerican Airlines

Wed 8/276:00 pmDCA - SEA

1 stop8h 40mAmerican Airlines

Deal found 6/10

$267

Wed 10/110:09 amSEA - IAD

1 stop9h 40mAmerican Airlines

Mon 10/66:45 amIAD - SEA

1 stop10h 55mAmerican Airlines

Deal found 6/10

$267

Tue 9/29:29 pmSEA - BWI

Nonstop5h 04mHawaiian Airlines

Fri 9/57:22 pmBWI - SEA

Nonstop5h 43mHawaiian Airlines

Deal found 6/12

$268

Thu 8/216:17 amSEA - BWI

1 stop8h 27mFrontier

Thu 8/286:29 pmBWI - SEA

1 stop9h 05mFrontier

Deal found 6/10

$270

Sat 11/88:55 amSEA - IAD

Nonstop4h 51mHawaiian Airlines

Sat 11/86:11 pmIAD - SEA

Nonstop5h 53mHawaiian Airlines

Deal found 6/10

$271

Thu 8/77:05 amSEA - IAD

1 stop9h 14mAlaska Airlines

Wed 8/136:30 amIAD - SEA

Nonstop5h 47mAlaska Airlines

Deal found 6/12

$273

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 June 12, 2025.

Thu 7/247:30 pmSEA - BWI

1 stop7h 16mDelta

Tue 7/298:18 amBWI - SEA

1 stop8h 32mDelta

Deal found 6/10

$227

Wed 8/207:00 pmSEA - BWI

1 stop7h 21mUnited Airlines

Sun 8/246:15 amBWI - SEA

1 stop8h 16mUnited Airlines

Deal found 6/9

$251

Tue 8/126:34 amSEA - BWI

1 stop8h 29mAmerican Airlines

Sun 8/177:20 pmBWI - SEA

1 stop8h 34mAmerican Airlines

Deal found 6/10

$252

Tue 7/13:58 pmSEA - BWI

1 stop10h 45mSpirit Airlines

Tue 7/86:00 amBWI - SEA

1 stop12h 03mSpirit Airlines

Deal found 6/10

$257

Tue 10/216:00 amSEA - DCA

1 stop8h 01mFrontier

Tue 10/286:00 pmDCA - SEA

1 stop8h 02mFrontier

Deal found 6/10

$257

Mon 9/86:00 amSEA - BWI

1 stop9h 04mMultiple Airlines

Wed 9/178:00 amBWI - SEA

1 stop10h 53mMultiple Airlines

Deal found 6/10

$265

Tue 9/29:29 pmSEA - BWI

Nonstop5h 04mHawaiian Airlines

Fri 9/57:22 pmBWI - SEA

Nonstop5h 43mHawaiian Airlines

Deal found 6/12

$268

Thu 8/77:05 amSEA - IAD

1 stop9h 14mAlaska Airlines

Wed 8/136:30 amIAD - SEA

Nonstop5h 47mAlaska Airlines

Deal found 6/12

$273

Wed 8/205:35 amSEA - BWI

1 stop9h 10mSouthwest

Sun 8/249:25 amBWI - SEA

Nonstop5h 45mSouthwest

Deal found 6/9

$287

Wed 8/209:50 pmSEA - DCA

1 stop8h 51mJetBlue

Wed 8/2712:40 pmDCA - SEA

1 stop12h 30mJetBlue

Deal found 6/10

$289

Fri 7/1111:59 pmSEA - IAD

1 stop8h 44mSun Country Air

Sat 7/1912:46 pmIAD - SEA

1 stop13h 01mSun Country Air

Deal found 6/10

$295

Tue 8/1912:45 amSEA - DCA

1 stop7h 15mAmerican Airlines

Wed 8/276:00 pmDCA - SEA

1 stop8h 40mAmerican Airlines

Deal found 6/10

$267

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated June 12, 2025 and is based on user searches.

Wed 6/186:25 amSEA - DCA

1 stop7h 32mMultiple Airlines

Wed 7/98:59 amDCA - SEA

1 stop10h 46mMultiple Airlines

Deal found 6/9

$508

Wed 6/181:58 pmSEA - DCA

Nonstop5h 01mHawaiian Airlines

Wed 7/98:59 amDCA - SEA

1 stop10h 46mHawaiian Airlines

Deal found 6/9

$513

Thu 6/197:48 pmSEA - BWI

1 stop17h 37mFrontier

Mon 6/235:20 pmBWI - SEA

1 stop10h 14mFrontier

Deal found 6/11

$370

Thu 6/193:59 pmSEA - IAD

Nonstop5h 00mAlaska Airlines

Thu 7/107:59 pmIAD - SEA

1 stop15h 05mAlaska Airlines

Deal found 6/9

$503

Fri 6/208:01 pmSEA - DCA

1 stop12h 59mFrontier

Wed 6/256:00 pmDCA - SEA

1 stop8h 44mFrontier

Deal found 6/11

$360

Fri 6/203:11 pmSEA - IAD

1 stop12h 19mFrontier

Thu 6/267:30 amIAD - SEA

1 stop9h 41mFrontier

Deal found 6/11

$365

Fri 6/206:25 amSEA - BWI

1 stop7h 00mMultiple Airlines

Mon 6/306:00 amBWI - SEA

1 stop12h 03mMultiple Airlines

Deal found 6/12

$368

Fri 6/203:58 pmSEA - BWI

1 stop10h 45mSpirit Airlines

Fri 6/276:00 amBWI - SEA

1 stop12h 03mSpirit Airlines

Deal found 6/10

$375

Fri 6/2011:59 pmSEA - IAD

1 stop8h 50mSun Country Air

Sat 7/512:40 pmIAD - SEA

1 stop13h 07mSun Country Air

Deal found 6/10

$390

Fri 6/2011:59 pmSEA - BWI

1 stop8h 24mSun Country Air

Wed 6/2512:25 pmBWI - SEA

1 stop13h 25mSun Country Air

Deal found 6/10

$427

Fri 6/2011:59 pmSEA - IAD

2 stops17h 53mMultiple Airlines

Sat 7/512:40 pmIAD - SEA

1 stop13h 07mMultiple Airlines

Deal found 6/10

$460

Fri 6/209:55 pmSEA - IAD

Nonstop5h 04mDelta

Sat 7/57:40 amIAD - SEA

Nonstop5h 48mDelta

Deal found 6/10

$513

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 June 12, 2025.

Fri 7/47:40 amSEA - BWI

1 stop7h 52mDelta

Deal found 6/11

$124

Fri 8/2911:54 pmSEA - BWI

1 stop7h 01mUnited Airlines

Deal found 6/10

$126

Sat 7/125:30 pmSEA - BWI

1 stop9h 35mSpirit Airlines

Deal found 6/11

$128

Mon 8/186:25 amSEA - BWI

1 stop7h 06mFrontier

Deal found 6/11

$135

Wed 8/209:29 pmSEA - BWI

Nonstop5h 04mAlaska Airlines

Deal found 6/9

$139

Wed 9/107:20 amSEA - DCA

Nonstop5h 09mDelta

Deal found 6/10

$139

Tue 9/98:00 amSEA - IAD

Nonstop5h 10mUnited Airlines

Deal found 6/10

$139

Wed 8/206:41 amSEA - DCA

1 stop12h 18mFrontier

Deal found 6/9

$141

Tue 7/2911:30 pmSEA - IAD

Nonstop4h 57mHawaiian Airlines

Deal found 6/11

$141

Thu 7/1711:57 pmSEA - IAD

1 stop9h 32mSun Country Air

Deal found 6/10

$145

Thu 8/1411:59 pmSEA - BWI

1 stop8h 24mSun Country Air

Deal found 6/11

$148

Tue 8/127:00 amSEA - DCA

1 stop10h 59mAlaska Airlines

Deal found 6/10

$148

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

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 10/8

6:00 am-3:55 pm

1 stop6h 55m

Baltimore/Washington

Wed 10/15

6:49 am-11:53 am

1 stop8h 04m

$214

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 11/26

12:40 am-10:51 am

1 stop7h 11m

Baltimore/Washington

Tue 12/2

6:15 pm-11:34 pm

1 stop8h 19m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 8/20

7:00 pm-5:21 am

1 stop7h 21m

Baltimore/Washington

Sun 8/24

6:15 am-11:31 am

1 stop8h 16m

$251

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 7/1

3:58 pm-5:43 am

1 stop10h 45m

Baltimore/Washington

Tue 7/8

6:00 am-3:03 pm

1 stop12h 03m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 10/21

6:00 am-5:01 pm

1 stop8h 01m

Washington, D.C. Reagan-National

Tue 10/28

6:00 pm-11:02 pm

1 stop8h 02m

$257

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 9/8

6:00 am-6:04 pm

1 stop9h 04m

Baltimore/Washington

Wed 9/17

8:00 am-3:53 pm

1 stop10h 53m

$265

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 8/19

12:45 am-11:00 am

1 stop7h 15m

Washington, D.C. Reagan-National

Wed 8/27

6:00 pm-11:40 pm

1 stop8h 40m

$267

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 10/1

10:09 am-10:49 pm

1 stop9h 40m

Washington, D.C. Dulles Intl

Mon 10/6

6:45 am-2:40 pm

1 stop10h 55m

$267

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 9/2

9:29 pm-5:33 am

Nonstop5h 04m

Baltimore/Washington

Fri 9/5

7:22 pm-10:05 pm

Nonstop5h 43m

$268

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 8/21

6:17 am-5:44 pm

1 stop8h 27m

Baltimore/Washington

Thu 8/28

6:29 pm-12:34 am

1 stop9h 05m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 55 results

...

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

Airlines

Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, ideal for comfort on medium-haul flights.

Alaska's Wi-Fi is a flat fee, perfect for business travelers needing connectivity on longer flights.

Read more about Alaska Airlinesby Robert Schrader

United Airlines

United's Economy Plus offers extra legroom, ideal for added comfort on medium-haul flights.

United's Polaris Lounges offer exclusive amenities like showers and dining for premium passengers.

Read more about United Airlinesby Harriet Baskas

Airports

SEA

Use SEA Spot Saver to book security screening appointments in advance, reducing wait times significantly. Reserve online a few days before your flight.

DCA

DCA is easily accessible via the Metro, with a dedicated stop on the Yellow and Blue lines, making it the most affordable transport option.

IAD

Take the Silver Line Metro from IAD to downtown D.C. in under 40 minutes. It's a cost-effective and convenient option for travelers.

Our travel experts

Robert Schrader

Expert on Alaska Airlines

Harriet Baskas

Expert on United Airlines

Emily Zemler

Expert on DCA

Ramsey Qubein

Expert on IAD

Brandon Schultz

Expert on SEA

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.?

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 90 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, August is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $241). Flying from Seattle to Washington, D.C. in March is currently the most expensive (average of $290). 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 31% versus a flight at noon.

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 Saturday 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.

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

The most flights from SEA to WAS are scheduled on a Thursday (41 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (26 on average).

Rainfall in Washington, D.C. by month

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.

Temperature in Washington, D.C. 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 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).

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Alaska Airlines, Southwest and Delta from Seattle to Washington, D.C. have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines

8.0

Very good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Southwest

8.0

Very good

4,287 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta

8.0

Very good

7,950 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Hawaiian Airlines

7.9

Good

2,494 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

United Airlines

7.4

Good

8,790 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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.. 9 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 32 outbound flights to Washington, D.C. per day.
How popular is this Seattle to Washington, D.C. flight route?
Flights from Seattle/Tacoma Intl to Washington, D.C. have been viewed 12 times in the past calendar month.
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 $227 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $251 and $252 round-trip. Delta is currently priced 42% 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 Delta, with whom users have recently found tickets for as low as $124. However, be on the lookout for offers from United Airlines and Spirit 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 - Baltimore/Washington and Seattle/Tacoma Intl - Washington, D.C. Reagan-National.
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 Hawaiian Airlines (74%), Air Tahiti Nui (73%) or Alaska Airlines (61%) 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 $337, our data shows the cheapest flight currently is $138. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $271 for that flight.
Where are the most common layover locations when flying from Seattle to Washington, D.C.?
Flights departing from Seattle and landing in Washington, D.C. layover in Denver most frequently.
What are some popular things to do or see while on a layover in Denver?
Coors Field, Paramount Theatre, and Larimer Square are the most popular attractions in Denver if you're in need of something to do during your layover. Coors Field, Paramount Theatre, and Larimer Square can be visited by traveling about 18.4 mi, 18.6 mi, and 18.9 mi respectively from Denver Intl. Those on a layover in Denver in need of a rental car can book one at Denver Intl for about $54.
Where are the least popular layover locations for Seattle to Washington, D.C. flights?
Of the flights from Seattle to Washington, D.C. that have layovers, the fewest flights stop in Chicago.
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, August is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $241). Flying from Seattle to Washington, D.C. in March is currently the most expensive (average of $290). 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 9 airlines flying from Seattle to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$86	Average$237	FlexibilityNo cancel fee	On-time62%
Hawaiian Airlines	Cheapest$143	Average$417	FlexibilityNo cancel fee	On-time85%
Spirit Airlines	Cheapest$182	Average$267	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$203	Average$391	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$206	Average$444	FlexibilityNo cancel fee	On-time71%
Sun Country Air	Cheapest$208	Average$534	FlexibilityNo cancel fee	On-time83%
United Airlines	Cheapest$238	Average$425	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$253	Average$480	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$296	Average$437	FlexibilityNo cancel fee	On-time63%

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$124+ Cheap flights from Seattle (SEA) to Washington, D.C. (WAS)

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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or March, booked 90 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

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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 June 12, 2025.

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 June 12, 2025.

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

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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.

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 June 9, 2025.

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 June 12, 2025.

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 June 8, 2025.

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

Rainfall in Washington, D.C. by month

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

Temperature in Washington, D.C. by month

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

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Alaska Airlines, Southwest and Delta from Seattle to Washington, D.C. have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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.?

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

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.?

Where are the most common layover locations when flying from Seattle to Washington, D.C.?

What are some popular things to do or see while on a layover in Denver?

Where are the least popular layover locations for Seattle to Washington, D.C. flights?

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.?

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Alternative routes for Seattle to Washington, D.C.

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Top 9 airlines flying from Seattle to Washington, D.C.

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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 June 12, 2025.