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

Return flights

29 Jul - 30 Aug	TAP
28 Jul - 30 Aug	Lufthansa
21 Jul - 30 Aug	Lufthansa
29 Jul - 31 Aug	jetBlue
20 Jul - 24 Jul	Air Canada
21 Jul - 24 Jul	Lufthansa
28 Jul - 13 Aug	Lufthansa
23 Jul - 31 Jul	Lufthansa
28 Jul - 31 Jul	Lufthansa
19 Jul - 31 Jul	Air Canada
24 Jul - 04 Aug	Air Canada
25 Jul - 30 Jul	Air Canada
25 Jul - 04 Aug	Air Canada
25 Jul - 05 Aug	Air Canada
20 Jul - 27 Jul	jetBlue	direct
21 Jul - 28 Jul	Air Canada
29 Jul - 04 Aug	Air Canada
23 Jul - 24 Jul	United
24 Jul - 31 Jul	Air Canada
24 Jul - 18 Aug	Lufthansa

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

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 July from 389€

Return flights