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Washington, D.C.

$58+ 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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
Jan 4 — Jan 111
Sun 1/4
Sun 1/11
1 adult, Economy
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Find cheap flights from Seattle to Washington, D.C. with Cheapflights

1. Tell us where you want to go

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

2. Select your favorite providers

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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 August or July, booked 61 days in advance, depart on a Thursday or Friday and return on a Tuesday

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 December 5, 2025.

This CheapOair deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:25 pmSEA - DCA
1 stop20h 36mFrontier
Wed 1/78:59 amDCA - SEA
1 stop29h 22mFrontier
Deal found 12/3$228
This United Airlines deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:59 pmSEA - IAD
1 stop8h 46mUnited Airlines
Wed 1/75:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/4$228
This CheapOair deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:54 pmSEA - DCA
1 stop28h 05mFrontier
Wed 1/76:00 pmDCA - SEA
1 stop20h 21mFrontier
Deal found 12/4$234
This Mytrip deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:48 pmSEA - DCA
1 stop21h 18mFrontier
Fri 12/126:00 pmDCA - SEA
1 stop20h 53mFrontier
Deal found 12/3$240
This Alaska Airlines deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:54 amSEA - BWI
Nonstop5h 06mAlaska Airlines
Tue 1/67:00 pmBWI - SEA
Nonstop5h 53mAlaska Airlines
Deal found 12/4$257
This Delta deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:30 pmSEA - BWI
1 stop7h 15mDelta
Tue 1/66:59 pmBWI - SEA
2 stops18h 46mDelta
Deal found 12/4$265
This Southwest deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:35 amSEA - DCA
1 stop8h 40mSouthwest
Thu 1/83:25 pmDCA - SEA
2 stops10h 05mSouthwest
Deal found 12/4$265
This Alaska Airlines deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:00 amSEA - DCA
Nonstop5h 05mAlaska Airlines
Tue 1/68:00 amDCA - SEA
Nonstop5h 55mAlaska Airlines
Deal found 12/4$268
This United Airlines deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:59 pmSEA - BWI
1 stop6h 49mUnited Airlines
Wed 1/74:10 pmBWI - SEA
1 stop8h 05mUnited Airlines
Deal found 12/4$275
This CheapOair deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:48 pmSEA - DCA
1 stop30h 11mFrontier
Thu 12/182:00 pmDCA - SEA
1 stop25h 30mFrontier
Deal found 12/3$275
This Delta deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:30 pmSEA - BWI
1 stop7h 15mDelta
Thu 1/87:00 amBWI - SEA
2 stops14h 23mDelta
Deal found 12/4$276
This Delta deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:30 pmSEA - BWI
1 stop7h 15mDelta
Wed 1/74:45 pmBWI - SEA
1 stop9h 05mDelta
Deal found 12/4$277

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

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Washington, D.C. (WAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 5, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$226
(Kiwi.com)

One-way from

$58
(Southwest)

Popular in

November

Cheapest in

August

Average price

$480

Good round-trip deal

$283 or less

Good one-way deal

$196 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. 11% potential increase in price ($54 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 December 2025
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

 
Customize your flight search to find flights from Seattle to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 5, 2025.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Seattle

Fly to

Washington, D.C.

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/8

7:00 am-8:49 pm

1 stop10h 49m

Washington, D.C. Dulles Intl

Mon 1/19

5:55 pm-8:57 pm

Nonstop6h 02m

$228

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 2/5

8:06 am-8:00 pm

1 stop8h 54m

Washington, D.C. Reagan-National

Sat 2/7

8:00 am-11:09 am

Nonstop6h 09m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/8

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 1/21

3:42 pm-11:15 pm

1 stop10h 33m

$229

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/9

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Thu 1/22

8:59 am-5:29 pm

1 stop11h 30m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/6

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 1/21

6:00 am-12:20 pm

1 stop9h 20m

$229

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/9

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Tue 1/20

9:59 am-5:52 pm

1 stop10h 53m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/6

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Sun 1/18

12:23 pm-8:00 pm

1 stop10h 37m

$229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 3/2

12:43 pm-11:21 pm

1 stop7h 38m

Washington, D.C. Dulles Intl

Fri 3/6

1:15 pm-7:03 pm

1 stop8h 48m

$234

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/9

8:30 am-4:26 pm

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 1/12

6:04 pm-9:08 pm

Nonstop6h 04m

$238

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/13

8:45 am-9:55 pm

2 stops10h 10m

Washington, D.C. Dulles Intl

Sat 1/17

3:45 pm-9:05 pm

1 stop8h 20m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 60 results
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
JetabroadPrice Accuracy3 starsTrust Score*1 star

*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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.
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.?

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 November 28, 2025.

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 61 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $115). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of $216). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to WAS?

Find hourly flight availability from Seattle to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 5, 2025.

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 29% versus a flight in the morning.

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 November 29, 2025.

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Thursday afternoons when fares are most often at their lowest. Sunday mornings 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.

Explore weekly flight availability from Seattle to Washington, D.C.. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated December 5, 2025.

The most flights from SEA to WAS are scheduled on a Thursday (30 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (16 on average).

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

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
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.

Read more about SEAby Brandon Schultz
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.

Read more about DCAby Emily Zemler
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.

Read more about IADby Ramsey Qubein
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Emily Zemler

Emily Zemler

Expert on DCA

Emily Zemler

Emily Zemler

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.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

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.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

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 more

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington, D.C.. Reviews last updated December 5, 2025.
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
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,402 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,010 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Hawaiian Airlines
7.8
Good
2,817 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
9,064 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Frontier
5.8
Fair
3,089 reviews
Alaska Airlines
8.0
Very good
11,402 reviews

Entertainment

7.0

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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.?

    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 20 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 50m. United Airlines provides one of the quickest options available for as low as $229. 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 Frontier. Our recent data shows that you can find tickets from as low as $126 on this airline. Additional options worth looking into are Hawaiian Airlines and Delta, starting at $138 and $173 round-trip. Frontier is currently priced 68% 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 Southwest, with whom users have recently found tickets for as low as $115. However, be on the lookout for offers from Frontier and Hawaiian 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 Copa Airlines (100%), Avianca (97%) or United Airlines (96%) 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 $1,065, our data shows the cheapest flight currently is $155. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $158 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 $50.

  • 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $115). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of $216). 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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Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Fairfax
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

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Top 8 airlines flying from Seattle to Washington, D.C.

Discover the top 8 airlines that operate flights from Seattle to Washington, D.C.. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$128Average$258FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$143Average$402FlexibilityNo cancel feeOn-time85%
FrontierCheapest$148Average$281FlexibilityNo cancel feeOn-time62%
DeltaCheapest$188Average$390FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$206Average$503FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$419FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$234Average$442FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$264Average$467FlexibilityNo cancel feeOn-time75%

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