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

Return flights

27 Jan - 28 Jan	Air Canada
24 Jan - 14 Feb	TAP
11 Jan - 16 Jan	Iberia For Level
19 Jan - 26 Jan	Iberia For Level
19 Jan - 30 Jan	Iberia For Level
25 Jan - 31 Jan	Iberia For Level
22 Jan - 05 Feb	Iberia For Level
20 Jan - 03 Feb	Iberia For Level
19 Jan - 12 Feb	TAP
19 Jan - 29 Jan	TAP
11 Jan - 18 Jan	Iberia For Level
17 Jan - 24 Jan	TAP
23 Jan - 07 Feb	TAP
14 Jan - 21 Jan	TAP
13 Jan - 20 Jan	Iberia
27 Jan - 23 Feb	Iberia
31 Jan - 07 Feb	TAP
31 Jan - 23 Feb	Iberia
28 Jan - 23 Feb	Air Canada
28 Jan - 11 Feb	Air Canada

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 $387

Return flights