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

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Boston (BOS) to Seattle (SEA), with fares starting from $178.

What is the lowest current fare from BOS to SEA?

The lowest currently-listed fare from Boston (BOS) to Seattle (SEA) is $178 on 2026-06-30.

Direct flights from BOS to SEA cover approximately 4,004 km (2,488 miles), with an estimated flight time of 4h 43m. Operating airlines: AS, B6, DL.

Cheapest current fares: $178 in June 2026, 4,004 km direct flight in ~4h 43m.

Last updated May 24, 2026 · By Flightmaps Editorial

Lowest available fare per calendar month from Boston (BOS) to Seattle (SEA). Refreshed daily.

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

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Boston (BOS) to Seattle (SEA), with fares starting from $178.
What is the lowest current fare from BOS to SEA?

The lowest currently-listed fare from Boston (BOS) to Seattle (SEA) is $178 on 2026-06-30.
How long is the flight from Boston to Seattle?

Direct flights from BOS to SEA cover approximately 4,004 km (2,488 miles), with an estimated flight time of 4h 43m. Operating airlines: AS, B6, DL.

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