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 Spirit Airlines. Our recent data shows that you can find tickets from as low as $256 on this airline. Additional options worth looking into are Hawaiian Airlines and American Airlines, starting at $260 and $262 round-trip. Spirit Airlines is currently priced 35% 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 Spirit Airlines, with whom users have recently found tickets for as low as $128. However, be on the lookout for offers from Frontier 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 $1,332, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $277 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 Avianca (87%), Copa Airlines (85%) or Lufthansa (84%) 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..

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

Monday is generally a great day to depart. Flying on this day could help you save up to 29%.

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 75% 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 $466. For sooner than that we have options available in the next 3 days from $567.

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 $395 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 28% 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 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.

$128+ Flights from Seattle to Washington, D.C.

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 Tuesday or Thursday and return on a Tuesday

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

Round-trip from	$256 (Mytrip)
One-way from	$128 (FlightHub)
Popular in	December
Cheapest in	September
Average price	$407
Good round-trip deal	$334 or less
Good one-way deal	$190 or less

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. 7% potential increase in price ($33 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 July 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

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 julio 3, 2025.

mar. 7/155:30 pmSEA - BWI

1 stop9h 35mSpirit Airlines

mar. 7/296:22 pmBWI - SEA

2 stops25h 03mSpirit Airlines

Deal found 6/30

$256

mar. 8/55:30 pmSEA - BWI

1 stop9h 35mMultiple Airlines

sáb. 8/95:26 pmBWI - SEA

1 stop9h 16mMultiple Airlines

Deal found 7/1

$257

mar. 8/269:29 pmSEA - BWI

Nonstop5h 04mHawaiian Airlines

dom. 8/317:22 pmBWI - SEA

Nonstop5h 43mHawaiian Airlines

Deal found 7/3

$260

lun. 9/811:38 pmSEA - BWI

1 stop7h 35mAmerican Airlines

mié. 9/172:49 pmBWI - SEA

1 stop10h 40mAmerican Airlines

Deal found 7/2

$262

jue. 8/147:48 pmSEA - DCA

1 stop13h 16mFrontier

lun. 8/186:00 pmDCA - SEA

1 stop9h 34mFrontier

Deal found 7/1

$263

sáb. 8/236:25 amSEA - DCA

1 stop12h 34mMultiple Airlines

sáb. 8/305:06 pmDCA - SEA

Nonstop5h 50mMultiple Airlines

Deal found 7/2

$266

mié. 8/133:59 pmSEA - IAD

Nonstop5h 00mHawaiian Airlines

mié. 8/206:09 pmIAD - SEA

Nonstop5h 42mHawaiian Airlines

Deal found 6/30

$266

mié. 8/66:25 amSEA - BWI

1 stop7h 06mFrontier

lun. 8/185:26 pmBWI - SEA

1 stop10h 08mFrontier

Deal found 7/2

$271

lun. 7/143:11 pmSEA - IAD

1 stop12h 23mFrontier

vie. 7/187:30 amIAD - SEA

1 stop9h 36mFrontier

Deal found 7/2

$276

mié. 8/207:20 amSEA - DCA

Nonstop5h 05mDelta

mar. 8/264:59 pmDCA - SEA

Nonstop5h 51mDelta

Deal found 7/2

$277

mié. 8/139:55 pmSEA - IAD

Nonstop5h 00mDelta

mar. 8/197:35 amIAD - SEA

Nonstop5h 45mDelta

Deal found 7/3

$277

mar. 8/261:35 pmSEA - DCA

Nonstop5h 09mHawaiian Airlines

dom. 8/318:00 amDCA - SEA

Nonstop5h 49mHawaiian Airlines

Deal found 7/2

$280

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 julio 3, 2025.

mar. 7/155:30 pmSEA - BWI

1 stop9h 35mSpirit Airlines

mar. 7/296:22 pmBWI - SEA

2 stops25h 03mSpirit Airlines

Deal found 6/30

$256

mar. 8/55:30 pmSEA - BWI

1 stop9h 35mMultiple Airlines

sáb. 8/95:26 pmBWI - SEA

1 stop9h 16mMultiple Airlines

Deal found 7/1

$257

mar. 8/269:29 pmSEA - BWI

Nonstop5h 04mHawaiian Airlines

dom. 8/317:22 pmBWI - SEA

Nonstop5h 43mHawaiian Airlines

Deal found 7/3

$260

lun. 9/811:38 pmSEA - BWI

1 stop7h 35mAmerican Airlines

mié. 9/172:49 pmBWI - SEA

1 stop10h 40mAmerican Airlines

Deal found 7/2

$262

jue. 8/147:48 pmSEA - DCA

1 stop13h 16mFrontier

lun. 8/186:00 pmDCA - SEA

1 stop9h 34mFrontier

Deal found 7/1

$263

jue. 8/289:29 pmSEA - BWI

Nonstop5h 04mAlaska Airlines

jue. 9/47:37 pmBWI - SEA

Nonstop5h 50mAlaska Airlines

Deal found 7/1

$277

mié. 8/207:20 amSEA - DCA

Nonstop5h 05mDelta

mar. 8/264:59 pmDCA - SEA

Nonstop5h 51mDelta

Deal found 7/2

$277

jue. 8/286:30 amSEA - BWI

1 stop8h 55mSouthwest

lun. 9/16:45 pmBWI - SEA

Nonstop5h 45mSouthwest

Deal found 7/1

$287

mié. 8/1310:05 pmSEA - IAD

Nonstop4h 57mUnited Airlines

mié. 8/202:39 pmIAD - SEA

1 stop9h 38mUnited Airlines

Deal found 7/3

$287

jue. 8/711:59 pmSEA - BWI

1 stop8h 30mSun Country Air

lun. 8/1812:19 pmBWI - SEA

1 stop13h 31mSun Country Air

Deal found 7/2

$289

sáb. 8/236:25 amSEA - DCA

1 stop12h 34mMultiple Airlines

sáb. 8/305:06 pmDCA - SEA

Nonstop5h 50mMultiple Airlines

Deal found 7/2

$266

mié. 8/133:59 pmSEA - IAD

Nonstop5h 00mHawaiian Airlines

mié. 8/206:09 pmIAD - SEA

Nonstop5h 42mHawaiian Airlines

Deal found 6/30

$266

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated julio 3, 2025 and is based on user searches.

mar. 7/89:12 amSEA - IAD

1 stop23h 31mSun Country Air

mar. 7/2212:40 pmIAD - SEA

1 stop22h 31mSun Country Air

Deal found 7/1

$385

mar. 7/810:05 pmSEA - IAD

Nonstop4h 57mUnited Airlines

mar. 7/2210:06 pmIAD - SEA

Nonstop5h 50mUnited Airlines

Deal found 7/1

$493

mié. 7/99:12 amSEA - BWI

1 stop23h 11mSun Country Air

mar. 7/1512:25 pmBWI - SEA

1 stop22h 34mSun Country Air

Deal found 7/1

$395

mié. 7/97:00 amSEA - IAD

1 stop9h 19mAlaska Airlines

mar. 7/228:19 pmIAD - SEA

1 stop16h 28mAlaska Airlines

Deal found 7/1

$512

mié. 7/912:20 amSEA - DCA

1 stop7h 36mUnited Airlines

mar. 8/56:00 pmDCA - SEA

1 stop7h 42mUnited Airlines

Deal found 7/1

$513

vie. 7/113:11 pmSEA - IAD

1 stop12h 23mFrontier

dom. 7/137:30 amIAD - SEA

1 stop9h 36mFrontier

Deal found 7/1

$290

vie. 7/113:11 pmSEA - IAD

1 stop12h 23mMultiple Airlines

sáb. 7/1912:46 pmIAD - SEA

1 stop13h 01mMultiple Airlines

Deal found 7/3

$372

vie. 7/118:01 pmSEA - DCA

1 stop22h 56mMultiple Airlines

mar. 7/155:02 pmDCA - SEA

Nonstop5h 58mMultiple Airlines

Deal found 7/2

$450

sáb. 7/126:25 amSEA - DCA

1 stop12h 32mFrontier

mar. 7/151:00 pmDCA - SEA

1 stop13h 42mFrontier

Deal found 7/3

$281

sáb. 7/126:25 amSEA - BWI

1 stop7h 06mMultiple Airlines

mié. 8/66:15 pmBWI - SEA

1 stop25h 10mMultiple Airlines

Deal found 7/1

$314

sáb. 7/126:25 amSEA - BWI

1 stop7h 06mFrontier

mié. 7/165:26 pmBWI - SEA

1 stop9h 16mFrontier

Deal found 7/3

$321

dom. 7/135:30 pmSEA - BWI

2 stops17h 04mSpirit Airlines

mié. 8/66:15 pmBWI - SEA

1 stop25h 10mSpirit Airlines

Deal found 7/1

$372

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 julio 3, 2025.

jue. 7/175:30 pmSEA - BWI

1 stop9h 35mSpirit Airlines

Deal found 7/1

$128

vie. 8/226:17 amSEA - BWI

1 stop8h 24mFrontier

Deal found 7/2

$133

lun. 8/259:29 pmSEA - BWI

Nonstop5h 04mAlaska Airlines

Deal found 7/2

$139

sáb. 8/239:42 pmSEA - BWI

1 stop30h 12mMultiple Airlines

Deal found 7/2

$142

vie. 8/811:59 pmSEA - BWI

1 stop8h 24mSun Country Air

Deal found 7/3

$148

sáb. 9/68:00 amSEA - DCA

1 stop9h 59mHawaiian Airlines

Deal found 7/2

$148

jue. 9/186:31 pmSEA - IAD

1 stop14h 52mSun Country Air

Deal found 7/3

$148

jue. 9/115:45 pmSEA - BWI

1 stop9h 15mDelta

Deal found 7/1

$149

jue. 7/317:40 amSEA - DCA

Nonstop5h 09mDelta

Deal found 7/1

$149

jue. 7/249:55 pmSEA - IAD

Nonstop5h 02mDelta

Deal found 7/3

$149

lun. 10/135:26 pmSEA - BWI

1 stop10h 47mUnited Airlines

Deal found 7/1

$150

jue. 7/246:25 amSEA - DCA

1 stop7h 34mFrontier

Deal found 7/3

$150

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

mar. 7/15

5:30 pm-6:05 am

1 stop9h 35m

Baltimore/Washington

mar. 7/29

6:22 pm-4:25 pm

2 stops25h 03m

$256

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

mar. 8/5

5:30 pm-6:05 am

1 stop9h 35m

Baltimore/Washington

sáb. 8/9

5:26 pm-11:42 pm

1 stop9h 16m

$257

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

mar. 8/26

9:29 pm-5:33 am

Nonstop5h 04m

Baltimore/Washington

dom. 8/31

7:22 pm-10:05 pm

Nonstop5h 43m

$260

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

lun. 9/8

11:38 pm-10:13 am

1 stop7h 35m

Baltimore/Washington

mié. 9/17

2:49 pm-10:29 pm

1 stop10h 40m

$262

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

jue. 8/14

7:48 pm-12:04 pm

1 stop13h 16m

Washington, D.C. Reagan-National

lun. 8/18

6:00 pm-12:34 am

1 stop9h 34m

$263

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

sáb. 8/23

6:25 am-9:59 pm

1 stop12h 34m

Washington, D.C. Reagan-National

sáb. 8/30

5:06 pm-7:56 pm

Nonstop5h 50m

$266

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

mié. 8/13

3:59 pm-11:59 pm

Nonstop5h 00m

Washington, D.C. Dulles Intl

mié. 8/20

6:09 pm-8:51 pm

Nonstop5h 42m

$266

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

mié. 8/6

6:25 am-4:31 pm

1 stop7h 06m

Baltimore/Washington

lun. 8/18

5:26 pm-12:34 am

1 stop10h 08m

$271

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

lun. 7/14

3:11 pm-6:34 am

1 stop12h 23m

Washington, D.C. Dulles Intl

vie. 7/18

7:30 am-2:06 pm

1 stop9h 36m

$276

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

mié. 8/20

7:20 am-3:25 pm

Nonstop5h 05m

Washington, D.C. Reagan-National

mar. 8/26

4:59 pm-7:50 pm

Nonstop5h 51m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 48 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 $309). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of $345). 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 29% 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 Tuesday 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 Wednesday (41 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (17 on average).

Reviews of airlines servicing Washington, D.C.

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

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

4,266 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

7,982 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

7.8

Good

2,545 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

8,861 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.. 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 32 outbound flights to Washington, D.C. per day.
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 Spirit Airlines. Our recent data shows that you can find tickets from as low as $256 on this airline. Additional options worth looking into are Hawaiian Airlines and American Airlines, starting at $260 and $262 round-trip. Spirit Airlines is currently priced 35% 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 Spirit Airlines, with whom users have recently found tickets for as low as $128. However, be on the lookout for offers from Frontier 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 Avianca (87%), Copa Airlines (85%) or Lufthansa (84%) 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 $1,332, our data shows the cheapest flight currently is $148. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $277 for that flight.
Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Seattle to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Washington, D.C..
Can I find deals for business class flights from Seattle to Washington, D.C.?
Yes. Cheapflights offers flight deals from Seattle to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $309). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of $345). 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.

See more FAQs

Arlington

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

Easton

Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$86	Average$236	FlexibilityNo cancel fee	On-time62%
Hawaiian Airlines	Cheapest$143	Average$417	FlexibilityNo cancel fee	On-time85%
Spirit Airlines	Cheapest$178	Average$274	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$206	Average$388	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$206	Average$437	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$237	Average$418	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$257	Average$477	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$296	Average$454	FlexibilityNo cancel fee	On-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$128+ 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to Washington, D.C. with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 Tuesday or Thursday and return on a Tuesday

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 julio 3, 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 julio 3, 2025.

Cheapflights Fare Finder

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

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

United Airlines

Airports

SEA

DCA

IAD

Our travel experts

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 27, 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 julio 3, 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 29, 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, Southwest, and Delta 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.?

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

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

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

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

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

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

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

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

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

Traveling to a place near Seattle?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.

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

100% Free

Book with Flexibility

Travel Smart

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 julio 3, 2025.