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

Return flights

27 Jan - 29 Jan	Air Canada
21 Jan - 23 Jan	SWISS
20 Jan - 22 Jan	SWISS
27 Jan - 30 Jan	Air Canada
18 Jan - 19 Jan	Air Canada
15 Jan - 24 Jan	TAP
22 Jan - 31 Jan	TAP
23 Jan - 31 Jan	TAP
23 Jan - 29 Jan	TAP
22 Jan - 29 Jan	TAP
27 Jan - 02 Feb	Lufthansa
26 Jan - 03 Feb	Austrian Airlines
28 Jan - 02 Feb	Austrian Airlines
28 Jan - 03 Feb	Austrian Airlines
30 Jan - 06 Feb	Austrian Airlines
23 Jan - 05 Feb	jetBlue	direct
28 Jan - 03 Feb	jetBlue	direct
28 Jan - 05 Feb	jetBlue	direct
26 Jan - 03 Feb	jetBlue	direct
23 Jan - 13 Feb	Aer Lingus

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 $388

Return flights