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

Return flights

14 Jan - 24 Jan	TAP
15 Jan - 22 Jan	TAP
22 Jan - 26 Jan	Iberia For Level
08 Jan - 31 Jan	Iberia For Level
12 Jan - 07 Feb	Iberia For Level
16 Jan - 23 Jan	TAP
08 Jan - 15 Jan	TAP
06 Jan - 14 Jan	Iberia For Level
12 Jan - 19 Jan	Iberia For Level
05 Jan - 19 Jan	Lufthansa
23 Jan - 07 Feb	Aer Lingus
21 Jan - 28 Jan	Aer Lingus
27 Jan - 03 Feb	British Airways	direct
28 Jan - 21 Feb	British Airways	direct
12 Jan - 07 Feb	British Airways	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 357€

Return flights