- Cheapest roundtrip flight
- from€446
- Fastest outbound flight
- Fastest inbound flight
- non-stop flights
- 31x / week
- Flight distance
- 3,706 km
- Time difference
- Most popular airlines
- Alaska Airlines

- United Airlines

- Delta Air Lines

- Alaska Airlines
Flight schedule from Washington DC (IAD) to Seattle-Tacoma (SEA)
Select a travel date in the flight schedule for the route from Washington DC (IAD) to Seattle-Tacoma (SEA) and compare affordable flight deals.
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Matching outbound flightsIAD–SEA · 13 of 13
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- September 20 – 26, 2026
- Sep 27 – Oct 3, 2026
- October 4 – 10, 2026
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Important flight information
Frequently Asked Questions (FAQ)
How long is the flight from Washington DC to Seattle-Tacoma?
A nonstop flight from Washington DC to Seattle-Tacoma typically takes around 6 hours. This makes the nonstop service the fastest and most convenient way to travel between Washington DC and Seattle-Tacoma. It is worth checking flight times when searching, as they can vary by airline and travel date.
Are there nonstop flights from Washington DC to Seattle-Tacoma?
Yes, there are nonstop flights from Washington DC to Seattle-Tacoma, averaging around 4 to 5 flights per day, operated by, among others, Alaska Airlines, United Airlines and Delta. If you want to fly without a layover, it is worth filtering specifically for nonstop flights when searching.
Which airlines fly from Washington DC to Seattle-Tacoma?
Direct flights from Washington DC to Seattle-Tacoma are operated by, among others, Alaska Airlines, United Airlines and Delta. These flights take you to Seattle-Tacoma nonstop, making them especially practical for short trips or weekend getaways. It is still worth comparing departure times and airline policies, as baggage rules and fees can vary.
On which days are there nonstop flights from Washington DC to Seattle-Tacoma?
Nonstop flights from Washington DC to Seattle-Tacoma operate daily. The schedule may vary by season, so it is worth comparing several travel dates. If your preferred day does not have a nonstop flight, nearby departure days or short connecting flights may be a good alternative.
How many flights are there per day from Washington DC to Seattle-Tacoma?
On the route from Washington DC to Seattle-Tacoma, there are on average around 4 to 5 flights per day. The number of flights can vary by day of the week and season. If you are flexible with your dates, it is worth comparing several departure days.
How many flights per week are there from Washington DC to Seattle-Tacoma?
From Washington DC to Seattle-Tacoma, there are around 31 to 32 flights per week. This means you usually have connections available on several days and at various times. Beyond the price, it is worth comparing flight duration, airline, and any potential additional fees.
When does the first flight from Washington DC to Seattle-Tacoma depart?
The earliest nonstop flight from Washington DC to Seattle-Tacoma usually departs at 6:30 AM. The exact departure time may vary by day of the week and airline. Early flights are especially useful if you want to make the most of your arrival day in Seattle-Tacoma.
When does the last flight from Washington DC to Seattle-Tacoma depart?
The last nonstop flight from Washington DC to Seattle-Tacoma usually departs at 5:57 PM. Late flights can be convenient if you want to travel after work or in the evening. Do check whether it is a nonstop flight, as a connecting itinerary could push the arrival time significantly later.
Which airports near Washington DC are frequently used for flights to Seattle-Tacoma?
In addition to Washington DC airport, users also frequently search for flights from Washington DC to Seattle-Tacoma. Alternative departure airports can offer more choice of flight times, airlines or prices. Also check how accessible each airport is for you.