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

Return flights

09 Jan - 11 Jan	Iberia
18 Jan - 21 Jan	Scandinavian Airlines
24 Jan - 31 Jan	SWISS
07 Jan - 14 Jan	Lufthansa
07 Jan - 15 Jan	Lufthansa
16 Jan - 21 Jan	Lufthansa
10 Jan - 15 Jan	Austrian Airlines
15 Jan - 22 Jan	Austrian Airlines
08 Jan - 14 Jan	Austrian Airlines
13 Jan - 22 Jan	Austrian Airlines
29 Jan - 02 Feb	Aer Lingus
16 Jan - 01 Feb	Aer Lingus
29 Jan - 01 Feb	Aer Lingus
28 Jan - 04 Feb	Icelandair
16 Jan - 01 Feb	Finnair	direct
29 Jan - 01 Feb	British Airways	direct
25 Jan - 01 Feb	Icelandair
31 Jan - 07 Feb	Icelandair

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 369€

Return flights