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

Return flights

21 Jan - 28 Jan	SWISS
12 Jan - 29 Jan	SWISS
14 Jan - 21 Jan	SWISS
21 Jan - 27 Jan	SWISS
14 Jan - 20 Jan	SWISS
20 Jan - 26 Jan	SWISS
27 Jan - 02 Feb	SWISS
28 Jan - 03 Feb	SWISS
22 Jan - 28 Jan	SWISS
29 Jan - 05 Feb	Iberia
22 Jan - 26 Jan	Iberia
23 Jan - 26 Jan	Iberia
15 Jan - 26 Jan	Iberia
21 Jan - 04 Feb	Delta
29 Jan - 08 Feb	SWISS
26 Jan - 10 Feb	Delta
26 Jan - 06 Feb	Delta
25 Jan - 01 Feb	Delta
20 Jan - 01 Feb	KLM
17 Jan - 28 Feb	British Airways

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

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 January from $566

Return flights