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

A quick flight from Seattle to Washington, D.C. can take about 5h 15m. Delta provides one of the quickest options available for as low as $257. The distance between Seattle and Washington, D.C. is about 2321 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 Frontier. Our recent data shows that you can find tickets from as low as $130 on this airline. Additional options worth looking into are Hawaiian Airlines and Delta, starting at $143 and $211 round-trip. Frontier is currently priced 67% 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 $144. However, be on the lookout for offers from Hawaiian Airlines and Alaska 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 $844, our data shows the cheapest flight currently is $152. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $241 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 Austrian Airlines (87%), Brussels Airlines (87%) or Lufthansa (83%) 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 Chicago 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 Denver.

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

Magnificent Mile, River North, and Grant Park are the most popular attractions in Chicago if you're in need of something to do during your layover. Magnificent Mile, River North, and Grant Park can be visited by traveling about 15.5 mi, 15.0 mi, and 16.2 mi respectively from Chicago O'Hare Intl. Those on a layover in Chicago in need of a rental car can book one at Chicago O'Hare Intl for about $52.

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 30%.

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 61 days in advance, which can save you up to 83% on flights from Seattle to Washington, D.C. compared to booking the week you need them. Waiting 61 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 $479. For sooner than that we have options available in the next 3 days from $574.

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

August is one of the best times of the year to fly to Washington, D.C. from Seattle. Prices for August average $400 per person but you can even find prices for as low as $235. The most expensive prices can be found in the month of December. Opting for a August flight can save you 30% 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.. 8 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 30 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.

$138+ 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 August or March, booked 60 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	$203 (Delta)
One-way from	$138 (Kiwi.com)
Popular in	December
Cheapest in	August
Average price	$417
Good round-trip deal	$298 or less
Good one-way deal	$188 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. 9% potential increase in price ($44 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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

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

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

Cheapest flights from Seattle to Washington, D.C.
Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

Mon 11/179:08 amSEA - BWI

1 stop31h 11mMultiple Airlines

Fri 12/56:00 amBWI - SEA

1 stop15h 20mMultiple Airlines

Deal found 9/14

$211

Wed 10/17:00 amSEA - BWI

2 stops35h 14mFrontier

Mon 10/66:27 pmBWI - SEA

1 stop20h 40mFrontier

Deal found 9/14

$214

Thu 10/231:02 pmSEA - BWI

2 stops41h 03mFrontier

Mon 10/276:29 pmBWI - SEA

1 stop20h 44mFrontier

Deal found 9/13

$215

Sun 10/198:43 pmSEA - BWI

1 stop18h 01mFrontier

Fri 10/246:29 pmBWI - SEA

1 stop20h 38mFrontier

Deal found 9/15

$218

Thu 10/161:02 pmSEA - BWI

1 stop25h 30mFrontier

Sun 10/266:29 pmBWI - SEA

1 stop16h 04mFrontier

Deal found 9/13

$220

Fri 12/55:11 pmSEA - BWI

1 stop11h 08mUnited Airlines

Wed 12/104:15 pmBWI - SEA

1 stop8h 00mUnited Airlines

Deal found 9/15

$222

Mon 10/136:39 pmSEA - BWI

1 stop19h 37mMultiple Airlines

Sat 10/185:35 amBWI - SEA

1 stop17h 13mMultiple Airlines

Deal found 9/14

$223

Fri 10/241:02 pmSEA - BWI

1 stop14h 33mMultiple Airlines

Mon 10/276:29 pmBWI - SEA

1 stop20h 44mMultiple Airlines

Deal found 9/14

$226

Wed 11/55:00 pmSEA - BWI

1 stop10h 00mDelta

Tue 11/117:15 amBWI - SEA

1 stop8h 41mDelta

Deal found 9/15

$227

Tue 10/2112:34 amSEA - BWI

1 stop7h 46mAmerican Airlines

Wed 12/36:00 amBWI - SEA

1 stop8h 37mAmerican Airlines

Deal found 9/15

$228

Tue 11/1112:41 amSEA - BWI

2 stops10h 10mAmerican Airlines

Mon 11/244:48 pmBWI - SEA

1 stop9h 51mAmerican Airlines

Deal found 9/14

$232

Wed 11/125:40 amSEA - BWI

2 stops8h 20mSouthwest

Wed 11/193:10 pmBWI - SEA

2 stops10h 45mSouthwest

Deal found 9/15

$237

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 15, 2025.

Tue 10/71:35 pmSEA - BWI

1 stop7h 14mDelta

Wed 10/156:00 amBWI - SEA

1 stop7h 33mDelta

Deal found 9/13

$227

Thu 1/88:00 amSEA - DCA

Nonstop5h 15mAlaska Airlines

Thu 1/225:30 pmDCA - SEA

Nonstop5h 55mAlaska Airlines

Deal found 9/14

$257

Thu 1/89:55 amSEA - DCA

2 stops10h 25mSouthwest

Tue 1/206:00 amDCA - SEA

1 stop10h 15mSouthwest

Deal found 9/14

$282

Mon 1/512:00 pmSEA - BWI

1 stop8h 50mDelta

Sun 1/187:00 amBWI - SEA

1 stop8h 29mDelta

Deal found 9/14

$227

Mon 1/512:00 pmSEA - BWI

1 stop8h 50mDelta

Fri 1/238:10 amBWI - SEA

1 stop9h 44mDelta

Deal found 9/13

$227

Mon 1/51:55 pmSEA - DCA

Nonstop5h 04mAlaska Airlines

Mon 1/195:30 pmDCA - SEA

Nonstop5h 55mAlaska Airlines

Deal found 9/15

$257

Mon 1/512:00 pmSEA - BWI

1 stop8h 50mDelta

Tue 1/207:10 amBWI - SEA

1 stop10h 58mDelta

Deal found 9/13

$227

Wed 1/71:45 pmSEA - DCA

Nonstop5h 10mAlaska Airlines

Tue 1/208:00 amDCA - SEA

Nonstop5h 55mAlaska Airlines

Deal found 9/14

$257

Thu 11/131:39 pmSEA - BWI

1 stop7h 10mDelta

Mon 11/177:15 amBWI - SEA

1 stop8h 41mDelta

Deal found 9/14

$227

Thu 1/88:00 amSEA - DCA

Nonstop5h 15mAlaska Airlines

Tue 1/208:00 amDCA - SEA

Nonstop5h 55mAlaska Airlines

Deal found 9/14

$257

Sat 10/45:45 pmSEA - BWI

1 stop9h 15mDelta

Tue 10/77:10 pmBWI - SEA

1 stop7h 47mDelta

Deal found 9/13

$227

Fri 1/98:00 amSEA - DCA

Nonstop5h 15mAlaska Airlines

Thu 1/225:30 pmDCA - SEA

Nonstop5h 55mAlaska Airlines

Deal found 9/14

$257

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated September 15, 2025 and is based on user searches.

Wed 10/17:00 amSEA - BWI

2 stops35h 14mFrontier

Mon 10/66:27 pmBWI - SEA

1 stop20h 40mFrontier

Deal found 9/14

$214

Thu 10/26:12 amSEA - BWI

2 stops15h 05mFrontier

Thu 10/96:06 pmBWI - SEA

2 stops16h 27mFrontier

Deal found 9/14

$237

Mon 10/61:47 pmSEA - BWI

1 stop24h 29mMultiple Airlines

Sat 10/115:35 amBWI - SEA

1 stop17h 13mMultiple Airlines

Deal found 9/13

$232

Mon 10/136:39 pmSEA - BWI

1 stop19h 37mMultiple Airlines

Sat 10/185:35 amBWI - SEA

1 stop17h 13mMultiple Airlines

Deal found 9/14

$223

Thu 10/161:02 pmSEA - BWI

1 stop25h 30mFrontier

Sun 10/266:29 pmBWI - SEA

1 stop16h 04mFrontier

Deal found 9/13

$220

Sun 10/198:43 pmSEA - BWI

1 stop18h 01mFrontier

Fri 10/246:29 pmBWI - SEA

1 stop20h 38mFrontier

Deal found 9/15

$218

Tue 10/2112:34 amSEA - BWI

1 stop7h 46mAmerican Airlines

Wed 12/36:00 amBWI - SEA

1 stop8h 37mAmerican Airlines

Deal found 9/15

$228

Tue 10/211:20 pmSEA - BWI

2 stops12h 55mSouthwest

Sun 10/2610:40 pmBWI - SEA

1 stop13h 30mSouthwest

Deal found 9/14

$238

Thu 10/231:02 pmSEA - BWI

2 stops41h 03mFrontier

Mon 10/276:29 pmBWI - SEA

1 stop20h 44mFrontier

Deal found 9/13

$215

Fri 10/241:02 pmSEA - BWI

1 stop14h 33mMultiple Airlines

Mon 10/276:29 pmBWI - SEA

1 stop20h 44mMultiple Airlines

Deal found 9/14

$226

Mon 10/271:02 pmSEA - BWI

1 stop14h 33mMultiple Airlines

Sat 11/15:35 amBWI - SEA

1 stop18h 02mMultiple Airlines

Deal found 9/15

$211

Mon 10/273:37 pmSEA - BWI

1 stop11h 03mUnited Airlines

Thu 10/306:15 amBWI - SEA

1 stop8h 28mUnited Airlines

Deal found 9/15

$227

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 15, 2025.

Thu 11/137:17 pmSEA - BWI

2 stops35h 36mMultiple Airlines

Deal found 9/13

$138

Sat 11/2212:59 amSEA - BWI

1 stop7h 15mAmerican Airlines

Deal found 9/14

$139

Fri 11/142:22 pmSEA - BWI

2 stops20h 48mFrontier

Deal found 9/13

$140

Tue 11/1112:58 pmSEA - BWI

2 stops27h 21mMultiple Airlines

Deal found 9/13

$141

Fri 12/127:05 pmSEA - BWI

2 stops18h 53mMultiple Airlines

Deal found 9/13

$142

Fri 10/312:22 pmSEA - BWI

2 stops13h 13mMultiple Airlines

Deal found 9/14

$143

Thu 10/91:02 pmSEA - BWI

2 stops25h 22mFrontier

Deal found 9/13

$144

Sat 11/1512:58 pmSEA - BWI

2 stops18h 15mFrontier

Deal found 9/13

$145

Sun 10/266:16 pmSEA - BWI

1 stop14h 04mSun Country Air

Deal found 9/12

$146

Fri 10/36:12 amSEA - BWI

2 stops15h 05mFrontier

Deal found 9/13

$147

Sun 10/56:28 pmSEA - BWI

1 stop13h 22mSun Country Air

Deal found 9/14

$148

Sat 12/1310:09 amSEA - BWI

Nonstop5h 07mAlaska Airlines

Deal found 9/15

$149

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

Tue 10/7

1:35 pm-11:49 pm

1 stop7h 14m

Baltimore/Washington

Wed 10/15

6:00 am-10:33 am

1 stop7h 33m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 1/5

12:00 pm-11:50 pm

1 stop8h 50m

Baltimore/Washington

Sun 1/18

7:00 am-12:29 pm

1 stop8h 29m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 1/5

12:00 pm-11:50 pm

1 stop8h 50m

Baltimore/Washington

Fri 1/23

8:10 am-2:54 pm

1 stop9h 44m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 1/5

12:00 pm-11:50 pm

1 stop8h 50m

Baltimore/Washington

Tue 1/20

7:10 am-3:08 pm

1 stop10h 58m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 11/13

1:39 pm-11:49 pm

1 stop7h 10m

Baltimore/Washington

Mon 11/17

7:15 am-12:56 pm

1 stop8h 41m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Sat 10/4

5:45 pm-6:00 am

1 stop9h 15m

Baltimore/Washington

Tue 10/7

7:10 pm-11:57 pm

1 stop7h 47m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 1/7

11:25 am-11:42 pm

1 stop9h 17m

Baltimore/Washington

Sat 1/24

7:00 am-12:29 pm

1 stop8h 29m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 1/9

6:00 am-3:53 pm

1 stop6h 53m

Baltimore/Washington

Sun 1/18

7:00 am-2:54 pm

1 stop10h 54m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 1/6

11:05 pm-10:02 am

1 stop7h 57m

Baltimore/Washington

Thu 1/22

8:10 am-2:54 pm

1 stop9h 44m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 1/8

12:00 pm-11:50 pm

1 stop8h 50m

Baltimore/Washington

Sun 1/18

6:00 am-10:45 am

1 stop7h 45m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 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 60 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 $292). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of $337). 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 28% versus a flight in the morning.

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.

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

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

Reviews of airlines servicing Washington, D.C.

Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian 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

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Alaska Airlines

8.0

Very good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Delta

8.0

Very good

7,954 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Hawaiian Airlines

7.8

Good

2,723 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

United Airlines

7.4

Good

8,929 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Frontier

5.8

Fair

3,172 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.. 8 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 30 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 5h 15m. Delta provides one of the quickest options available for as low as $257. The distance between Seattle and Washington, D.C. is about 2321 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 Frontier. Our recent data shows that you can find tickets from as low as $130 on this airline. Additional options worth looking into are Hawaiian Airlines and Delta, starting at $143 and $211 round-trip. Frontier is currently priced 67% 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 $144. However, be on the lookout for offers from Hawaiian Airlines and Alaska 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 Austrian Airlines (87%), Brussels Airlines (87%) or Lufthansa (83%) 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 $844, our data shows the cheapest flight currently is $152. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $241 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 Chicago most frequently.
What are some popular things to do or see while on a layover in Chicago?
Magnificent Mile, River North, and Grant Park are the most popular attractions in Chicago if you're in need of something to do during your layover. Magnificent Mile, River North, and Grant Park can be visited by traveling about 15.5 mi, 15.0 mi, and 16.2 mi respectively from Chicago O'Hare Intl. Those on a layover in Chicago in need of a rental car can book one at Chicago O'Hare Intl for about $52.
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 Denver.
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 $292). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of $337). 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 8 airlines flying from Seattle to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$130	Average$238	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$130	Average$276	FlexibilityNo cancel fee	On-time65%
Hawaiian Airlines	Cheapest$143	Average$402	FlexibilityNo cancel fee	On-time85%
Delta	Cheapest$206	Average$393	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$206	Average$437	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$247	Average$442	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$261	Average$422	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$268	Average$474	FlexibilityNo cancel fee	On-time75%

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$138+ 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 11/13. 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 August or March, booked 60 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 September 15, 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 September 15, 2025.

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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.

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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 September 12, 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 September 15, 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 September 14, 2025.

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

Reviews of airlines servicing Washington, D.C.

Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian 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

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 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.?

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 Chicago?

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.?

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

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Alternative routes for Seattle to Washington, D.C.

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Top 8 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 September 15, 2025.