Flight Routes from Washington DC to Seattle Tacoma

Compare cheap outbound and return flights from Washington DC (IAD) to Seattle-Tacoma (SEA) and find the best offer from numerous airlines and travel agencies.

Trip type
Cheapest roundtrip flight
from€446
Fastest outbound flight
Fastest inbound flight
non-stop flights
14x / week
Flight distance
3,706 km
Time difference
Most popular airlines
  1. United Airlines
  2. Delta Air Lines
  3. 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 · 8 of 8
fromto
dep.arr.
durationstopovers
  1. October 25 – 31, 2026
  2. November 1 – 7, 2026
  3. November 8 – 14, 2026
    No flights could be found for the active filters.
    1. IADSEA
      nonstop
      1. Alaska Airlines
    2. IADSEA
      nonstop
      1. Alaska Airlines
    3. IADSEA
      nonstop
      1. Delta Air Lines
    4. IADSEA
      nonstop
      1. Virgin Atlantic Airways
    5. IADSEA
      nonstop
      1. Alaska Airlines
    6. IADSEA
      nonstop
      1. Alaska Airlines
    7. IADSEA
      nonstop
      1. Alaska Airlines
    8. IADSEA
      nonstop
      1. United Airlines

      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 5 hours 35 minutes. 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, although not necessarily every day. On average, around 14 flights per week are available. If you have flexibility with your travel dates, you will have an easier time finding a suitable nonstop connection.
      Which airlines fly from Washington DC to Seattle-Tacoma?
      Direct flights from Washington DC to Seattle-Tacoma are operated by, among others, United Airlines, Delta and Alaska Airlines. 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 2 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?
      On the route from Washington DC to Seattle-Tacoma, there are around 14 flights per week. The number of flights can vary depending on the season and day of the week. If you have flexibility, it is worth looking at several departure days.
      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 7:00 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 5:55 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.

      Discover more flights around Washington DC and Seattle-Tacoma

      Departure airport Airport Washington DC - Dulles International Airport, DC (IAD)
      Arrival airport Airport Seattle-Tacoma International Airport, WA (SEA)
      Destination country Flights to United States
      City-Code - Arrival airport Washington-DC - Seattle-Tacoma International Airport, WA
      Departure airport - Destination country Washington DC - Dulles International Airport, DC - United States