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

Return flights

29 Jun - 02 Jul	SWISS
29 Jun - 01 Jul	SWISS
27 Jun - 29 Jun	Lufthansa
30 Jun - 03 Jul	Air Canada
30 Jun - 09 Jul	Air Canada
29 Jun - 05 Jul	Delta
29 Jun - 04 Jul	SWISS
27 Jun - 30 Jun	Iberia
29 Jun - 03 Jul	SWISS
30 Jun - 07 Jul	Air Canada
28 Jun - 05 Jul	Delta
29 Jun - 07 Jul	SWISS
28 Jun - 29 Jun	Air France
28 Jun - 29 Jun	British Airways	direct
28 Jun - 28 Jun	British Airways
27 Jun - 27 Jun	British Airways

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

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 Boston to London in June from $492

Return flights