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

Return flights

18 Jan - 31 Jan	TAP
20 Jan - 27 Jan	TAP
24 Jan - 31 Jan	TAP
19 Jan - 27 Jan	TAP
31 Jan - 07 Feb	TAP
29 Jan - 05 Feb	TAP
23 Jan - 03 Feb	TAP
29 Jan - 01 Feb	TAP
21 Jan - 27 Jan	TAP
16 Jan - 22 Jan	TAP
29 Jan - 02 Feb	TAP
24 Jan - 07 Feb	TAP
26 Jan - 28 Jan	SWISS
27 Jan - 03 Feb	British Airways
26 Jan - 06 Feb	American Airlines
27 Jan - 30 Jan	Scandinavian Airlines
25 Jan - 05 Feb	British Airways
30 Jan - 04 Feb	British Airways
20 Jan - 27 Jan	jetBlue	direct
19 Jan - 27 Jan	jetBlue	direct

Also check the deals for one-way flights from Boston to London 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 Boston to London in January from 359€

Return flights