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

Best time to book flights for London (LHR) to Boston (BOS) flights at AirHint

AirHint found the following cheapest return flights from London (LHR) to Boston (BOS) in May 2025 (see full year).

Return flights

06 May - 12 May Eurowings
07 May - 14 May SWISS
10 May - 15 May SWISS
14 May - 18 May SWISS
15 May - 20 May SWISS
12 May - 23 May SWISS
13 May - 18 May United
09 May - 21 May United
10 May - 21 May United
10 May - 23 May United
13 May - 04 Jun SWISS
10 May - 13 Jun SWISS
15 May - 04 Jun SWISS
10 May - 04 Jun SWISS
15 May - 15 Jun United
10 May - 01 Jun SWISS
13 May - 03 Jun SWISS
14 May - 14 Jun United
11 May - 04 Jun Lufthansa
09 May - 13 Jun SWISS

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

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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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