What is the cheapest month to fly from Seattle to Dulles?

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Seattle (SEA) to Dulles (IAD), with fares starting from $166.

What is the lowest current fare from SEA to IAD?

The lowest currently-listed fare from Seattle (SEA) to Dulles (IAD) is $166 on 2026-06-22.

Direct flights from SEA to IAD cover approximately 3,701 km (2,300 miles), with an estimated flight time of 4h 21m. Operating airlines: AS, DL, UA.

Cheapest current fares: $166 in June 2026, 3,701 km direct flight in ~4h 21m.

Last updated May 23, 2026 · By Flightmaps Editorial

Lowest available fare per calendar month from Seattle (SEA) to Dulles (IAD). Refreshed daily.

What is the cheapest month to fly from Seattle to Dulles?

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Seattle (SEA) to Dulles (IAD), with fares starting from $166.
What is the lowest current fare from SEA to IAD?

The lowest currently-listed fare from Seattle (SEA) to Dulles (IAD) is $166 on 2026-06-22.
How long is the flight from Seattle to Dulles?

Direct flights from SEA to IAD cover approximately 3,701 km (2,300 miles), with an estimated flight time of 4h 21m. Operating airlines: AS, DL, UA.

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