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

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Seattle (SEA) to Boston (BOS), with fares starting from $148.

What is the lowest current fare from SEA to BOS?

The lowest currently-listed fare from Seattle (SEA) to Boston (BOS) is $148 on 2026-06-06.

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

Cheapest current fares: $148 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 Seattle (SEA) to Boston (BOS). Refreshed daily.

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

Based on current 6-month forward fare data, June 2026 is the cheapest month to fly from Seattle (SEA) to Boston (BOS), with fares starting from $148.
What is the lowest current fare from SEA to BOS?

The lowest currently-listed fare from Seattle (SEA) to Boston (BOS) is $148 on 2026-06-06.
How long is the flight from Seattle to Boston?

Direct flights from SEA to BOS 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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