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

Return flights

30 Apr - 04 May	SWISS
23 Apr - 27 Apr	SWISS
16 Apr - 23 Apr	Lufthansa
30 Apr - 07 May	Lufthansa
16 Apr - 21 Apr	Lufthansa
21 Apr - 27 Apr	SWISS
29 Apr - 05 May	SWISS
17 Apr - 25 Apr	Lufthansa
30 Apr - 06 May	SWISS
15 Apr - 21 Apr	British Airways
16 Apr - 28 Apr	Lufthansa
14 Apr - 21 Apr	Lufthansa
20 Apr - 30 Apr	Lufthansa
21 Apr - 30 Apr	Lufthansa
27 Apr - 03 May	Lufthansa
30 Apr - 03 May	Lufthansa
27 Apr - 11 May	Delta
22 Apr - 01 May	KLM
27 Apr - 01 May	Delta
23 Apr - 01 May	Delta

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

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 April from $502

Return flights