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
15 Jan - 22 Jan	TAP
19 Jan - 14 Feb	TAP
12 Jan - 19 Jan	Lufthansa
13 Jan - 20 Jan	Lufthansa
07 Jan - 21 Jan	jetBlue	direct
13 Jan - 20 Jan	jetBlue	direct
12 Jan - 07 Feb	Aer Lingus
15 Jan - 20 Jan	Aer Lingus
26 Jan - 21 Feb	Aer Lingus
28 Jan - 21 Feb	Aer Lingus
15 Jan - 22 Jan	jetBlue	direct
22 Jan - 29 Jan	United
02 Jan - 09 Jan	Finnair	direct
19 Jan - 14 Feb	British Airways	direct
26 Jan - 21 Feb	Air France	direct
12 Jan - 07 Feb	British Airways	direct
28 Jan - 21 Feb	Air France	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 350€

Return flights