IAD → SEA
Flights from Washington to Seattle
Washington to Seattle (IAD–SEA) is a nonstop US transcontinental air route between the East Coast and the West Coast. It is served nonstop by 3 airlines. Use Flyroz to compare live fares, then book directly with the airline or travel site — we never add a booking fee.
Cheapest one-way from
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How long is the flight?
Nonstop flights from Washington (IAD) to Seattle (SEA) take roughly 4h 55m–5h 39m in the air, estimated from the ~3,702 km great-circle distance. Westbound coast-to-coast flights run longer than eastbound against the jet stream; this is an estimate, not a published block time.
Airlines flying this route
Nonstop IAD–SEA service is operated by Alaska Airlines, Delta Air Lines and United Airlines. Carriers were verified against FlightConnections (accessed 2026-07-13); schedules change over time, so check current results for your dates.
Direct vs. connecting flights
This is a long-haul domestic nonstop route. Nonstop is fastest; one-stop connecting itineraries via mid-continent hubs (Chicago, Denver, Dallas) are usually cheaper but add hours. Run a live search to compare.
Best time to fly & book
Fares tend to be higher around US holidays (Thanksgiving, Christmas, summer) and lower in the shoulder seasons. Booking a few weeks ahead and keeping dates flexible generally gives more choice.
Frequently asked questions
Is there a nonstop flight from Washington to Seattle?
Yes — IAD–SEA is served nonstop by Alaska Airlines, Delta Air Lines and United Airlines. Run a live search to compare fares on your dates.
How long is the flight from Washington to Seattle?
Nonstop flights take roughly 4h 55m–5h 39m in the air (a great-circle estimate; westbound is longer against the jet stream, and exact times vary by aircraft and conditions).
Which airlines fly nonstop from Washington to Seattle?
Nonstop service is operated by Alaska Airlines, Delta Air Lines and United Airlines. Schedules change, so confirm current options with a live search.
Related routes
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