Cheapest return flights from London to Boston in December from $475

Best time to book flights for London (LHR) to Boston (BOS) flights at AirHint

AirHint found the following cheapest return flights from London (LHR) to Boston (BOS) in December 2025 (see full year).

Return flights

03 Dec - 06 Dec SWISS
01 Dec - 12 Dec SWISS
04 Dec - 11 Dec TAP
05 Dec - 12 Dec British Airways
07 Dec - 10 Dec British Airways
28 Dec - 11 Jan Lufthansa
05 Dec - 12 Dec Air France direct
01 Dec - 12 Dec Air France direct
03 Dec - 06 Dec Finnair direct
26 Dec - 03 Jan United
15 Dec - 22 Dec Delta direct
28 Dec - 11 Jan Air France direct
17 Dec - 30 Dec Lufthansa
04 Dec - 02 Jan United
27 Dec - 03 Jan Lufthansa
16 Dec - 04 Jan United
28 Dec - 04 Jan United
16 Dec - 04 Jan Air France direct
28 Dec - 04 Jan Air France direct
04 Dec - 02 Jan Finnair direct

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

Skyscanner

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