Cheap flights from Seattle to Washington, D.C. from C$ 190
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 10/9. 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 12 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 12 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 12 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 12 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 - IAD
SEAIAD
Seattle/Tacoma Intl
Sat 8/11
8:55 a.m.-4:46 p.m.
Nonstop4h 51m
Washington, D.C. Dulles Intl
Sat 8/11
6:11 p.m.-9:04 p.m.
Nonstop5h 53m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 22/10
3:15 p.m.-11:15 p.m.
Nonstop5h 00m
Washington, D.C. Dulles Intl
Tue 28/10
7:00 a.m.-10:05 a.m.
Nonstop6h 05m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 8/10
1:46 p.m.-9:59 p.m.
Nonstop5h 13m
Washington, D.C. Reagan-National
Wed 15/10
8:00 a.m.-10:53 a.m.
Nonstop5h 53m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 12/11
9:25 a.m.-9:06 p.m.
1 stop8h 41m
Washington, D.C. Dulles Intl
Sat 15/11
5:55 p.m.-8:54 p.m.
Nonstop5h 59m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 8/10
7:55 a.m.-8:29 p.m.
1 stop9h 34m
Washington, D.C. Reagan-National
Wed 15/10
8:00 a.m.-10:53 a.m.
Nonstop5h 53m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Wed 9/7
3:59 p.m.-11:59 p.m.
Nonstop5h 00m
Washington, D.C. Dulles Intl
Tue 30/9
6:09 p.m.-8:51 p.m.
Nonstop5h 42m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 20/8
9:50 p.m.-11:37 a.m.
1 stop10h 47m
Washington, D.C. Reagan-National
Tue 26/8
12:40 p.m.-10:10 p.m.
1 stop12h 30m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Tue 7/10
10:54 p.m.-9:21 a.m.
1 stop7h 27m
Washington, D.C. Reagan-National
Wed 8/10
3:30 p.m.-10:30 p.m.
1 stop10h 00m
SeattleWashington, D.C.
SEA - IAD
SEAIAD
Seattle/Tacoma Intl
Fri 11/7
11:59 p.m.-11:43 a.m.
1 stop8h 44m
Washington, D.C. Dulles Intl
Sat 19/7
12:46 p.m.-10:47 p.m.
1 stop13h 01m
SeattleWashington, D.C.
SEA - DCA
SEADCA
Seattle/Tacoma Intl
Wed 20/8
6:45 a.m.-8:15 p.m.
2 stops10h 30m
Washington, D.C. Reagan-National
Wed 27/8
4:55 p.m.-10:50 p.m.
1 stop8h 55m
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 9 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$ 327). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of C$ 411). 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 12 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 8 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. Saturday 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 12 June 2025.
The most flights from SEA to WAS are scheduled on a Thursday (41 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (26 on average).
Rainfall in Washington, D.C. by month
Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Washington, D.C. ranges from 66.0 - 102.0 mm per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. when rainfall is around 66.0 mm.
Temperature in Washington, D.C. by month
Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.
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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).
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 12 June 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Seattle to Washington, D.C. by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
Boarding
Crew
Entertainment
Comfort
Overall
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Boarding
Crew
Entertainment
Comfort
Overall
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Boarding
Crew
Entertainment
Comfort
Overall
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Boarding
Crew
Entertainment
Comfort
Overall
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Boarding
Crew
Entertainment
Comfort
Overall
Reviews
Anonymous,Aug 2024
SEA - LAS
Food
Boarding
Crew
Entertainment
Comfort
Overall
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.
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Alternative routes for Seattle to Washington, D.C.
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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 12 June 2025.
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How does Cheapflights help users find flights from Seattle to Washington, D.C.?
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Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?
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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.