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

Return flights

27 Jan - 29 Jan	Iberia
16 Jan - 20 Jan	TAP
14 Jan - 22 Jan	TAP
20 Jan - 28 Jan	TAP
15 Jan - 28 Jan	TAP
15 Jan - 20 Jan	TAP
29 Jan - 06 Feb	TAP
13 Jan - 07 Feb	TAP
23 Jan - 10 Feb	TAP
22 Jan - 14 Feb	TAP
17 Jan - 07 Feb	TAP
24 Jan - 14 Feb	TAP
15 Jan - 07 Feb	TAP
21 Jan - 02 Feb	TAP
16 Jan - 07 Feb	TAP
15 Jan - 16 Jan	United
22 Jan - 31 Jan	TAP
29 Jan - 25 Feb	TAP
11 Jan - 31 Jan	TAP
06 Jan - 31 Jan	Aer Lingus

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Boston to London in January from $389

Return flights