AirHint found the following cheapest return flights from London (LHR) to Boston (BOS) in May 2026 (see full year).

Return flights

04 May - 11 May	Lufthansa
07 May - 10 May	SWISS
06 May - 10 May	SWISS
08 May - 18 May	SWISS
04 May - 09 May	Lufthansa
04 May - 18 May	Lufthansa
01 May - 10 May	Austrian Airlines
15 May - 25 May	SWISS
11 May - 20 May	Lufthansa
01 May - 08 May	Austrian Airlines
28 May - 10 Jun	Lufthansa
26 May - 01 Jun	Lufthansa
30 May - 08 Jun	SWISS
30 May - 14 Jun	Lufthansa
27 May - 24 Jun	SWISS
28 May - 04 Jun	Lufthansa
23 May - 06 Jun	Lufthansa
21 May - 04 Jun	SWISS
29 May - 02 Jun	Austrian Airlines
26 May - 01 Jun	British Airways	direct

Also check the deals for one-way flights from London to Boston in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Boston in May from 369€

Return flights