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

Return flights

24 Jan - 25 Jan	Icelandair
12 Jan - 04 Feb	Icelandair
16 Jan - 20 Jan	Icelandair
12 Jan - 22 Jan	Icelandair
22 Jan - 26 Jan	Icelandair
12 Jan - 18 Jan	Icelandair
20 Jan - 26 Jan	Icelandair
15 Jan - 02 Feb	Icelandair
15 Jan - 19 Jan	Icelandair
13 Jan - 16 Jan	Icelandair
14 Jan - 18 Jan	Icelandair
08 Jan - 11 Jan	Icelandair
31 Jan - 04 Feb	Icelandair
29 Jan - 02 Feb	Icelandair
29 Jan - 05 Feb	Icelandair
31 Jan - 28 Feb	Icelandair
28 Jan - 01 Feb	SWISS
26 Jan - 01 Feb	SWISS
15 Jan - 20 Feb	SWISS
31 Jan - 14 Feb	Lufthansa

Also check the deals for one-way flights from London to Boston 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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from London to Boston in January from 338€

Return flights