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

Based on current 6-month forward fare data, July 2026 is the cheapest month to fly from Boston (BOS) to London (LHR), with fares starting from $309.

What is the lowest current fare from BOS to LHR?

The lowest currently-listed fare from Boston (BOS) to London (LHR) is $309 on 2026-07-07.

How long is the flight from Boston to London?

Direct flights from BOS to LHR cover approximately 5,241 km (3,257 miles), with an estimated flight time of 6h 10m. Operating airlines: AA, B6, BA, DL, VS.

Cheap flights from Boston to London

Cheapest current fares: $309 in July 2026, 5,241 km direct flight in ~6h 10m.

Last updated May 25, 2026 · By Flightmaps Editorial

Cheapest month-by-month fares

Lowest available fare per calendar month from Boston (BOS) to London (LHR). Refreshed daily.

Boston (BOS) → London (LHR)

July 2026 $309
August 2026 $358
June 2026 $395
May 2026 $517

Frequently asked questions

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

Based on current 6-month forward fare data, July 2026 is the cheapest month to fly from Boston (BOS) to London (LHR), with fares starting from $309.
What is the lowest current fare from BOS to LHR?

The lowest currently-listed fare from Boston (BOS) to London (LHR) is $309 on 2026-07-07.
How long is the flight from Boston to London?

Direct flights from BOS to LHR cover approximately 5,241 km (3,257 miles), with an estimated flight time of 6h 10m. Operating airlines: AA, B6, BA, DL, VS.

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