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

Return flights

16 Jan - 23 Jan	TAP
09 Jan - 11 Jan	Delta
09 Jan - 10 Jan	Iberia
28 Jan - 21 Feb	Aer Lingus
12 Jan - 07 Feb	Aer Lingus
16 Jan - 19 Jan	Aer Lingus
28 Jan - 03 Feb	Aer Lingus
13 Jan - 20 Jan	Aer Lingus
04 Jan - 05 Feb	Air Canada
08 Jan - 11 Jan	Air Canada
08 Jan - 31 Jan	Air Canada
29 Jan - 03 Feb	Iberia
06 Jan - 13 Jan	United
06 Jan - 14 Jan	United
23 Jan - 30 Jan	United
04 Jan - 05 Feb	American Airlines	direct
12 Jan - 07 Feb	British Airways	direct
28 Jan - 21 Feb	Air France	direct
28 Jan - 03 Feb	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 $455

Return flights