Cheap flights from Seattle to Washington, D.C. from C$ 202
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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
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 Thursday or Friday and return on a Wednesday
Cheap 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 30 June 2025.
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 30 June 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 30 June 2025.
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 629,999 searches. Data last updated 30 June 2025.
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
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 20/8
7:20 a.m.-3:25 p.m.
Nonstop5h 05m
Washington, D.C. Reagan-National
Wed 27/8
4:59 p.m.-7:50 p.m.
Nonstop5h 51m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 20/8
4:20 p.m.-12:20 a.m.
Nonstop5h 00m
Washington, D.C. Dulles Intl
Wed 27/8
6:09 p.m.-8:51 p.m.
Nonstop5h 42m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Thu 7/8
11:30 p.m.-7:27 a.m.
Nonstop4h 57m
Washington, D.C. Dulles Intl
Tue 19/8
6:13 p.m.-9:00 p.m.
Nonstop5h 47m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 6/8
9:14 p.m.-8:03 a.m.
1 stop7h 49m
Washington, D.C. Reagan-National
Wed 13/8
1:44 p.m.-9:59 p.m.
1 stop11h 15m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Sat 30/8
8:35 a.m.-4:49 p.m.
Nonstop5h 14m
Washington, D.C. Reagan-National
Sun 31/8
8:00 a.m.-10:49 a.m.
Nonstop5h 49m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 15/10
7:52 a.m.-8:29 p.m.
1 stop9h 37m
Washington, D.C. Reagan-National
Tue 21/10
5:48 p.m.-11:04 p.m.
1 stop8h 16m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 20/8
5:35 a.m.-3:10 p.m.
1 stop6h 35m
Washington, D.C. Reagan-National
Wed 20/8
4:40 p.m.-11:10 p.m.
2 stops9h 30m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 20/8
12:10 p.m.-10:05 p.m.
1 stop6h 55m
Washington, D.C. Dulles Intl
Tue 26/8
2:25 p.m.-12:05 a.m.
2 stops12h 40m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Thu 14/8
11:59 p.m.-11:55 a.m.
1 stop8h 56m
Washington, D.C. Dulles Intl
Sun 17/8
12:40 p.m.-8:02 a.m.
1 stop22h 22m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 6/8
12:20 a.m.-11:55 a.m.
1 stop8h 35m
Washington, D.C. Dulles Intl
Sat 16/8
1:05 p.m.-3:53 p.m.
Nonstop5h 48m
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 27 June 2025.
Booking 90 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C.. 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 Seattle to Washington, D.C.?
Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 256). Flying from Seattle to Washington, D.C. in October is currently the most expensive (average of C$ 352). 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 30 June 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 64% on flights from Seattle to Washington, D.C. by exploring options for tickets in the afternoon.
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 29 June 2025.
Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Monday evenings when fares are most often at their lowest. Thursday evenings 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 30 June 2025.
The most flights from SEA to WAS are scheduled on a Monday (40 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (30 on average).
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 30 June 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Alaska Airlines,Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Crew
Entertainment
Overall
Boarding
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
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.
Travelling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsBrowse 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 airline flying from Seattle to Washington, D.C.
Discover the top airline 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 629,999 searches. Data last updated 30 June 2025.
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 Seattle to Washington, D.C.?
When you search for this flight from Seattle to Washington, D.C., Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Seattle to Washington, D.C.?
Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Washington, D.C. for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?
Yes, we can. To see specific flights from Seattle to Washington, D.C. with no change fees, users can toggle flexible booking options after using the search form above to find flights.
Can Cheapflights notify me if prices for flights from Seattle to Washington, D.C. become cheaper?
Yes, Cheapflights offers price alerts on Seattle to Washington, D.C. 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.