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

Return flights

14 Jul - 11 Aug	Delta
16 Jul - 14 Aug	Delta
15 Jul - 25 Jul	Lufthansa
16 Jul - 14 Aug	Air France	direct
16 Jul - 20 Jul	Lufthansa
16 Jul - 24 Jul	United
16 Jul - 28 Jul	United
15 Jul - 22 Jul	United
16 Jul - 25 Jul	Lufthansa
16 Jul - 23 Jul	United
15 Jul - 24 Jul	Delta
14 Jul - 21 Jul	Delta
16 Jul - 06 Aug	Delta
15 Jul - 27 Jul	United
15 Jul - 02 Aug	Lufthansa
14 Jul - 15 Aug	Delta
16 Jul - 17 Aug	KLM
16 Jul - 19 Aug	Virgin Atlantic	direct
13 Jul - 01 Aug	Delta
29 Jul - 05 Aug	Iberia For Level

Also check the deals for one-way flights from London to Boston 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 London to Boston in July from $523

Return flights