What airlines fly to District of Columbia?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to District of Columbia from Seattle according to our data. Alaska Airlines is the first choice among our users, with 52% of people opting to fly with this airline when traveling to District of Columbia. Keep in mind that there are 8 different airlines that fly to District of Columbia on a routine basis, so you have a few additional options to choose from.

How many flights depart from Seattle to District of Columbia on average per day?

27 flights are operational daily from Seattle to District of Columbia as of December 2025. The most popular departure time for this route is 10:00PM, with 41% of flights per day taking off at noon.

What is the cheapest airline that flies from Seattle/Tacoma Intl to District of Columbia?

United Airlines and Delta are the most popular carriers operating from Seattle/Tacoma Intl to District of Columbia

How many flights depart from Seattle to District of Columbia on average per week?

The number of flights available between Seattle and District of Columbia is 189 per week as of December 2025. The most frequent departure day is Fri, with 17% of weekly flights leaving on this day.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to District of Columbia?

Prices for flights from Seattle/Tacoma Intl Airport to District of Columbia refresh daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to District of Columbia?

There are 7 operators available for flights from Seattle/Tacoma Intl Airport to District of Columbia as of December 2025.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to District of Columbia?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to District of Columbia.

What documentation or ID do you need to fly to District of Columbia?

The necessary travel and health documents for your District of Columbia trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$125 Cheap Flights from Seattle to District of Columbia in 2025/26

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One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

5:38 pm - 9:59 pm

SEA

DCA

25h 21m2 stops

6:00 pm - 11:09 am

DCA

SEA

20h 09m1 stop

$207Frontier

Mon, Jan 12 - Wed, Jan 14

3:58 pm - 1:02 pm

SEA

DCA

18h 04m1 stop

6:00 pm - 11:19 am

DCA

SEA

20h 19m1 stop

$208Frontier

Sat, Jan 17 - Thu, Jan 22

5:25 am - 4:00 pm

SEA

DCA

7h 35m1 stop

4:44 pm - 7:43 pm

DCA

SEA

5h 59mnonstop

$209Delta

Thu, Jan 15 - Tue, Jan 27

6:10 am - 6:54 pm

SEA

IAD

9h 44m1 stop

7:30 am - 10:29 am

IAD

SEA

5h 59mnonstop

$209Delta

Sat, Feb 14 - Fri, Feb 20

12:34 pm - 4:59 pm

SEA

DCA

25h 25m1 stop

6:00 pm - 11:56 am

DCA

SEA

20h 56m2 stops

$211Frontier

Fri, Jan 23 - Sun, Jan 25

7:50 pm - 4:01 pm

SEA

DCA

17h 11m1 stop

6:59 pm - 8:47 am

DCA

SEA

16h 48m1 stop

$218Alaska Airlines

Tue, Feb 10 - Sat, Feb 14

9:27 am - 5:20 pm

SEA

IAD

4h 53mnonstop

7:05 am - 10:05 am

IAD

SEA

6h 00mnonstop

$218Alaska Airlines

Thu, Feb 12 - Thu, Feb 19

5:25 am - 4:00 pm

SEA

DCA

7h 35m1 stop

3:40 pm - 11:15 pm

DCA

SEA

10h 35m1 stop

$219Delta

Thu, Jan 15 - Tue, Jan 27

12:43 pm - 11:21 pm

SEA

IAD

7h 38m1 stop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$224United Airlines

Mon, Mar 2 - Sat, Mar 7

8:10 am - 4:16 pm

SEA

IAD

5h 06mnonstop

12:35 pm - 6:26 pm

IAD

SEA

8h 51m1 stop

$228United Airlines

Sun, Jan 25 - Sat, Jan 31

Southwest flights from Seattle to District of Columbia

Our best Southwest deals on Seattle to District of Columbia flight tickets

Southwest

Jan 24

SEA12:40 pmSeattle/Tacoma Intl

6h 30m

1 stop

IAD10:10 pmWashington, D.C. Dulles Intl

Jan 31

IAD7:00 amWashington, D.C. Dulles Intl

16h 20m

2 stops

SEA8:20 pmSeattle/Tacoma Intl

$309

Find similar

Southwest

Jan 11

SEA6:35 amSeattle/Tacoma Intl

8h 20m

1 stop

DCA5:55 pmWashington, D.C. Reagan-National

Jan 18

DCA6:05 amWashington, D.C. Reagan-National

10h 10m

1 stop

SEA1:15 pmSeattle/Tacoma Intl

$393

Find similar

Southwest

Jan 8

SEA8:45 amSeattle/Tacoma Intl

10h 10m

2 stops

IAD9:55 pmWashington, D.C. Dulles Intl

Jan 13

IAD5:30 pmWashington, D.C. Dulles Intl

8h 00m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

$572

Find similar

Delta flights from Seattle to District of Columbia

Our best Delta deals on Seattle to District of Columbia flight tickets

Delta

Feb 14

SEA6:10 amSeattle/Tacoma Intl

9h 44m

1 stop

IAD6:54 pmWashington, D.C. Dulles Intl

Feb 20

IAD7:30 amWashington, D.C. Dulles Intl

5h 59m

SEA10:29 amSeattle/Tacoma Intl

$209

Find similar

Delta

Jan 17

SEA6:05 amSeattle/Tacoma Intl

9h 51m

1 stop

IAD6:56 pmWashington, D.C. Dulles Intl

Jan 24

IAD6:00 amWashington, D.C. Dulles Intl

7h 49m

1 stop

SEA10:49 amSeattle/Tacoma Intl

$219

Find similar

Delta

Feb 15

SEA3:20 pmSeattle/Tacoma Intl

4h 50m

IAD11:10 pmWashington, D.C. Dulles Intl

Feb 18

IAD7:30 amWashington, D.C. Dulles Intl

5h 59m

SEA10:29 amSeattle/Tacoma Intl

$239

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 1/12

5:38 pm-9:59 pm

2 stops25h 21m

Washington, D.C. Reagan-National

Wed 1/14

6:00 pm-11:09 am

1 stop20h 09m

$207

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 1/17

3:58 pm-1:02 pm

1 stop18h 04m

Washington, D.C. Reagan-National

Thu 1/22

6:00 pm-11:19 am

1 stop20h 19m

$208

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 1/15

5:25 am-4:00 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Tue 1/27

4:44 pm-7:43 pm

Nonstop5h 59m

$209

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 2/14

6:10 am-6:54 pm

1 stop9h 44m

Washington, D.C. Dulles Intl

Fri 2/20

7:30 am-10:29 am

Nonstop5h 59m

$209

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/23

12:34 pm-4:59 pm

1 stop25h 25m

Washington, D.C. Reagan-National

Sun 1/25

6:00 pm-11:56 am

2 stops20h 56m

$211

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 2/10

7:50 pm-4:01 pm

1 stop17h 11m

Washington, D.C. Reagan-National

Sat 2/14

6:59 pm-8:47 am

1 stop16h 48m

$218

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/12

9:27 am-5:20 pm

Nonstop4h 53m

Washington, D.C. Dulles Intl

Thu 2/19

7:05 am-10:05 am

Nonstop6h 00m

$218

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 1/15

5:25 am-4:00 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Tue 1/27

3:40 pm-11:15 pm

1 stop10h 35m

$219

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

Sat 3/7

5:55 pm-8:56 pm

Nonstop6h 01m

$224

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 1/25

8:10 am-4:16 pm

Nonstop5h 06m

Washington, D.C. Dulles Intl

Sat 1/31

12:35 pm-6:26 pm

1 stop8h 51m

$228

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Seattle to District of Columbia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to District of Columbia?

In general, August is the cheapest month to fly from Seattle to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $347. If you don’t want to visit District of Columbia in August, then you should wait until July to fly from Seattle, when ticket prices are also cheap, with an average price of $352.

What is the cheapest day to depart on your flight to District of Columbia?

The cheapest day to depart on your flight to District of Columbia is on a Thursday when prices can be found for as low as $424. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $576.

What is the cheapest time of day to depart on your flight to District of Columbia?

Flying to District of Columbia from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $338 when looking at flights departing in the afternoon. Flights to District of Columbia are more costly in the morning, with an average ticket price of $493. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Seattle/Tacoma Intl to District of Columbia flight route?

Fly from Seattle/Tacoma Intl to Washington, D.C. Reagan-National for the best Seattle/Tacoma Intl - District of Columbia flight prices

How far in advance should I book a flight to District of Columbia?

You are more likely to see cheaper flights to District of Columbia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to District of Columbia for around $406 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to District of Columbia from Seattle for as low as $289 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to District of Columbia flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to District of Columbia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Seattle to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to District of Columbia

Best Price Found	$188
Fastest flight time	4h 50m
Direct flights	Every day
Airports in District of Columbia	2 airports

The best one-way flight to District of Columbia from Seattle in the past 72 hours is $188. The best round-trip flight deal from Seattle to District of Columbia found on momondo in the last 72 hours is $239.

The fastest flight from Seattle to District of Columbia takes 4h 50m

Direct flights go from Seattle to District of Columbia every day.

There are 2 airports in District of Columbia. From Seattle there are direct flights to Washington, D.C. Reagan-National (DCA), Washington, D.C. Dulles Intl (IAD).

Search flight deals

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to District of Columbia?
Prices for flights from Seattle/Tacoma Intl Airport to District of Columbia refresh daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to District of Columbia?
There are 7 operators available for flights from Seattle/Tacoma Intl Airport to District of Columbia as of December 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to District of Columbia?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to District of Columbia.
What documentation or ID do you need to fly to District of Columbia?
The necessary travel and health documents for your District of Columbia trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to District of Columbia?
Based on momondo bookings for flights between Seattle and District of Columbia, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 25.05% of the total bookings. Other popular models include Boeing 737 with 16.99%, Boeing 737 MAX 9 with 16.02%, and Boeing 737-800 with 10.48%.

Best airlines flying from Seattle to District of Columbia

Compare and see reviews for airlines that fly from Seattle to District of Columbia with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $128	Free Cancellation	Rating 6.3 8,214 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,820 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $148	Free Cancellation	Rating 5.7 3,064 reviews	Search Frontier flights
American Airlines	PriceFrom $178	Free Cancellation	Rating 7.2 11,071 reviews	Search American Airlines flights
Delta	PriceFrom $184	Free Cancellation	Rating 7.9 8,016 reviews	Search Delta flights
United Airlines	PriceFrom $218	Free Cancellation	Rating 7.4 9,114 reviews	Search United Airlines flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $261	Free Cancellation	Rating 8.0 11,554 reviews	Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to District of Columbia?

Finding the right flight to District of Columbia from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to District of Columbia quick and easy, saving you time and money.

Can I find flights from Seattle to District of Columbia with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to District of Columbia flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to District of Columbia?

Once you have performed a search for Seattle to District of Columbia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Seattle to District of Columbia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to District of Columbia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your District of Columbia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Popular cities in District of Columbia

Flights to New Yorkfrom $50

Flights to Los Angelesfrom $47

Flights to Miamifrom $50

Flights to Chicagofrom $51

Flights to Orlandofrom $49

Flights to San Franciscofrom $59

Flights to Las Vegasfrom $49

Flights to Washington, D.C.from $58

Flights to Bostonfrom $51

Flights to Atlantafrom $44

Flights to Dallasfrom $51

Flights to Seattlefrom $57

District of Columbia flight routes

Flights from Boston Logan Intl to Washington, D.C. Reagan-National

Flights from Boston Logan Intl to Washington, D.C. Dulles Intl

Flights from Los Angeles to Washington, D.C. Dulles Intl

Flights from Atlanta Hartsfield-Jackson to Washington, D.C. Dulles Intl

Flights from San Francisco to Washington, D.C. Dulles Intl

Cheap flights from Seattle to District of Columbia from $125

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to District of Columbia departing on 2/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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Cheap round-trip flights

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Cheap last minute flights

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Southwest flights from Seattle to District of Columbia

Our best Southwest deals on Seattle to District of Columbia flight tickets

Delta flights from Seattle to District of Columbia

Our best Delta deals on Seattle to District of Columbia flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to District of Columbia that are best for you.

See travel insights to District of Columbia from

How to get the cheapest flight ticket from Seattle to District of Columbia

What is the cheapest month to fly to District of Columbia?

What is the cheapest day to depart on your flight to District of Columbia?

What is the cheapest time of day to depart on your flight to District of Columbia?

What is the cheapest Seattle/Tacoma Intl to District of Columbia flight route?

Fly from Seattle/Tacoma Intl to Washington, D.C. Reagan-National for the best Seattle/Tacoma Intl - District of Columbia flight prices

How far in advance should I book a flight to District of Columbia?

What cabin class options are available on Seattle/Tacoma Intl to District of Columbia flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to District of Columbia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

What is the cheapest airline that flies from Seattle/Tacoma Intl to District of Columbia?

United Airlines and Delta are the most popular carriers operating from Seattle/Tacoma Intl to District of Columbia

What airlines fly to District of Columbia?

How many flights depart from Seattle to District of Columbia on average per day?

27 flights are operational daily from Seattle to District of Columbia as of December 2025. The most popular departure time for this route is 10:00PM, with 41% of flights per day taking off at noon.

How many flights depart from Seattle to District of Columbia on average per week?

The number of flights available between Seattle and District of Columbia is 189 per week as of December 2025. The most frequent departure day is Fri, with 17% of weekly flights leaving on this day.

Cheap Seattle to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to District of Columbia

Best Price Found

Fastest flight time

Direct flights

Airports in District of Columbia

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to District of Columbia?

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to District of Columbia?

How old do you have to be to fly from Seattle/Tacoma Intl Airport to District of Columbia?

What documentation or ID do you need to fly to District of Columbia?

What is the most popular plane model from Seattle to District of Columbia?

Best airlines flying from Seattle to District of Columbia

Compare and see reviews for airlines that fly from Seattle to District of Columbia with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to District of Columbia?

Can I find flights from Seattle to District of Columbia with flexible booking policies on momondo?

How can momondo help me find flights from Seattle to District of Columbia?

I’m not ready to book a flight from Seattle to District of Columbia right now. Can momondo alert me if prices change?

An easier way to manage your District of Columbia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to District of Columbia

Popular cities in District of Columbia

Popular flights according to clicks in the last 7 days on momondo