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

Return flights

03 Mar - 10 Mar	Icelandair
02 Mar - 09 Mar	Icelandair
05 Mar - 09 Mar	Icelandair
02 Mar - 08 Mar	Icelandair
02 Mar - 05 Mar	Icelandair
01 Mar - 05 Mar	Icelandair
05 Mar - 08 Mar	Icelandair
01 Mar - 09 Mar	Icelandair
09 Mar - 16 Mar	SWISS
18 Mar - 31 Mar	SWISS
23 Mar - 01 Apr	Lufthansa
23 Mar - 02 Apr	Lufthansa
21 Mar - 13 Apr	Austrian Airlines
23 Mar - 02 Apr	British Airways	direct
23 Mar - 01 Apr	British Airways	direct
31 Mar - 06 Apr	TAP
29 Mar - 01 Apr	Scandinavian Airlines
30 Mar - 09 Apr	Scandinavian Airlines
30 Mar - 07 Apr	TAP
20 Mar - 11 Apr	TAP

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 340€

Return flights