Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 204

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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
4 May — 11 May1
1 adult

Cheap flight deals from Reagan-National to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to Seattle (SEA). 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 29 April 2025.

Round-trip from

C$ 356

One-way from

C$ 204

Popular in

June

Cheapest in

January

Average price

C$ 661

Good one-way deal

C$ 287 or less
Alaska Airlines
  • Alaska Airlines
  • 3/6-7/6
  • Nonstop
  • 11h 07m total
  • Washington, D.C. to Seattle
Search Deals
Frontier
  • Frontier
  • 11/5
  • 1 total stop
  • 25h 31m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
Price to beat on a one-way flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
Search Deals

Find flight deals from Reagan-National to Seattle

Cheapest flights from Reagan-National to Seattle
Explore the most affordable flight options available from Reagan-National to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 April 2025.

Tue 3/65:00 p.m.DCA - SEA
Nonstop5h 56mAlaska Airlines
Sat 7/61:48 p.m.SEA - DCA
Nonstop5h 11mAlaska Airlines
Deal found 28/4C$ 356
Sat 31/54:59 p.m.DCA - SEA
Nonstop5h 51mDelta
Sat 7/67:35 a.m.SEA - DCA
Nonstop5h 14mDelta
Deal found 28/4C$ 358
Tue 27/52:00 p.m.DCA - SEA
1 stop7h 53mUnited Airlines
Tue 3/611:37 p.m.SEA - DCA
1 stop7h 50mUnited Airlines
Deal found 28/4C$ 384
Tue 24/61:45 p.m.DCA - SEA
1 stop11h 08mJetBlue
Tue 1/79:14 p.m.SEA - DCA
1 stop9h 32mJetBlue
Deal found 28/4C$ 459
Wed 16/72:55 p.m.DCA - SEA
2 stops11h 20mSouthwest
Wed 23/710:40 p.m.SEA - DCA
1 stop9h 25mSouthwest
Deal found 28/4C$ 502

Cheapflights Fare Finder

Customize your flight search to find flights from Reagan-National to Seattle 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 629,999 searches. Data last updated 29 April 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Seattle that are best for you.

Fly from

Reagan-National

Fly to

Seattle

Route

Depart

Return

Price

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/6

5:00 p.m.-7:56 p.m.

Nonstop5h 56m

Seattle/Tacoma Intl

Sat 7/6

1:48 p.m.-9:59 p.m.

Nonstop5h 11m

C$ 356

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 31/5

4:59 p.m.-7:50 p.m.

Nonstop5h 51m

Seattle/Tacoma Intl

Sat 7/6

7:35 a.m.-3:49 p.m.

Nonstop5h 14m

C$ 358

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 27/5

2:00 p.m.-6:53 p.m.

1 stop7h 53m

Seattle/Tacoma Intl

Tue 3/6

11:37 p.m.-10:27 a.m.

1 stop7h 50m

C$ 384

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 24/6

1:45 p.m.-9:53 p.m.

1 stop11h 08m

Seattle/Tacoma Intl

Tue 1/7

9:14 p.m.-9:46 a.m.

1 stop9h 32m

C$ 459

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 16/7

2:55 p.m.-11:15 p.m.

2 stops11h 20m

Seattle/Tacoma Intl

Wed 23/7

10:40 p.m.-11:05 a.m.

1 stop9h 25m

C$ 502

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 11/5

1:00 p.m.-11:31 a.m.

1 stop25h 31m

C$ 204

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 7/6

5:00 p.m.-7:56 p.m.

Nonstop5h 56m

C$ 206

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 22/7

3:00 p.m.-10:10 p.m.

1 stop10h 10m

C$ 215

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 24/8

5:06 p.m.-7:56 p.m.

Nonstop5h 50m

C$ 234

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 24/8

12:50 p.m.-9:18 p.m.

1 stop11h 28m

C$ 241

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/4

Showing 1-10 of 14 results
1
2

Best time to book a flight from Reagan-National to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Reagan-National 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 Washington, D.C. Reagan-National Airport to Seattle

How far ahead should I book a flight from Washington, D.C. Reagan-National Airport to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to Seattle. Price data was last updated on 25 April 2025.

Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Reagan-National Airport to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 261). Flying from Washington, D.C. Reagan-National Airport to Seattle in December is currently the most expensive (average of C$ 353). 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 DCA to SEA?

Find hourly flight availability from Reagan-National to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 April 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Reagan-National Airport to Seattle as you normally would.

Weekly flight availability from Washington, D.C. Reagan-National Airport to Seattle

Explore weekly flight availability from Reagan-National to Seattle. 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 29 April 2025.

The most flights from DCA to SEA are scheduled on a Monday (9 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, 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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 29 April 2025.
Read through reviews of airlines operating flights from Washington, D.C. to Seattle, such as Alaska Airlines, Southwest and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,292 reviews
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,402 reviews
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews
Check prices

Boarding

8.2

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

Find useful and relevant information for your journey from Reagan-National to Seattle. 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 into for flights to Seattle from Washington, D.C. Reagan-National?

    Located just 18.4 km from the city centre, Seattle/Tacoma Intl is the airport most travellers will use when flying to Seattle from Washington, D.C. Reagan-National. Booking flights from Washington, D.C. Reagan-National to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 8 daily inbound flights from Washington, D.C. Reagan-National from 0 different airlines.

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

    Our cheapest airline available from Washington, D.C. Reagan-National Airport to Seattle is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 356 on this airline. Additional options worth looking into are Delta and United Airlines, starting at C$ 358 and C$ 384 round-trip. You may be able to fly from Washington, D.C. Reagan-National Airport to Seattle for 46% less than the average price by searching for these airlines.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at C$ 204. Alaska Airlines flights start at C$ 206 while deals on JetBlue start at C$ 215 one-way.

  • What are the most reliable airlines from Washington, D.C. Reagan-National Airport to Seattle?

    Before booking your flight to Seattle from Washington, D.C. Reagan-National Airport, check out the most reliable airlines to get you to your destination on time: Delta (96%), LATAM Airlines (94%), Kenya Airways( 94%).

  • What are the cheapest flights from Washington, D.C. Reagan-National Airport to Seattle?

    Looking for the cheapest flight from Washington, D.C. Reagan-National Airport to Seattle? While on average our users pay C$ 403, our data indicates the cheapest price to be C$ 280. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around C$ 578.

  • Can I find deals for flights from Reagan-National to Seattle that include hotel bookings?

    Yes. In addition to deals on Reagan-National to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Reagan-National to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Seattle.

  • Can I find deals for business class flights from Reagan-National to Seattle?

    Yes. Cheapflights offers flight deals from Reagan-National to Seattle 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 Washington, D.C. Reagan-National Airport to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 261). Flying from Washington, D.C. Reagan-National Airport to Seattle in December is currently the most expensive (average of C$ 353). 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

Travelling to a place near Washington, D.C. Reagan-National Airport?

Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locations
Tukwila
SeaTac
Tacoma
Marysville
Bothell
Olympia
Lynnwood
Leavenworth

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.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Reagan-National to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Reagan-National to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Reagan-National to Seattle?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Seattle from Reagan-National.

Can Cheapflights find flights from Reagan-National to Seattle with no change fees?

Yes! Cheapflights helps users easily find flights from Reagan-National to Seattle with no change fees.

Can Cheapflights notify me if prices for flights from Reagan-National to Seattle become cheaper?

Yes, Cheapflights offers price alerts on Reagan-National to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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.