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

Return flights

17 Mar - 21 Mar	SWISS
04 Mar - 17 Mar	SWISS
16 Mar - 22 Mar	SWISS
16 Mar - 19 Mar	SWISS
09 Mar - 13 Mar	SWISS
05 Mar - 09 Mar	SWISS
02 Mar - 10 Mar	SWISS
04 Mar - 08 Mar	SWISS
01 Mar - 08 Mar	SWISS
04 Mar - 21 Mar	SWISS
30 Mar - 09 Apr	Scandinavian Airlines
31 Mar - 07 Apr	TAP
23 Mar - 07 Apr	TAP
28 Mar - 12 Apr	TAP
27 Mar - 03 Apr	TAP
23 Mar - 07 Apr	British Airways	direct
27 Mar - 03 Apr	British Airways	direct
31 Mar - 07 Apr	British Airways	direct

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

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 March from $440

Return flights