Cheapest return flights from London to Boston in December from $445

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

Return flights

03 Dec - 10 Dec Aer Lingus
08 Dec - 15 Dec Aer Lingus
06 Dec - 13 Dec SWISS
05 Dec - 10 Dec SWISS
01 Dec - 07 Dec Scandinavian Airlines
03 Dec - 14 Dec Scandinavian Airlines
01 Dec - 08 Dec Scandinavian Airlines
10 Dec - 14 Dec SWISS
06 Dec - 07 Dec Scandinavian Airlines
10 Dec - 17 Dec Air Canada
16 Dec - 13 Jan Scandinavian Airlines
26 Dec - 17 Jan Air Canada
16 Dec - 13 Jan Air France direct
16 Dec - 06 Jan Austrian Airlines
30 Dec - 02 Jan Air France direct
17 Dec - 05 Jan Icelandair
17 Dec - 06 Jan Icelandair
13 Dec - 03 Jan Icelandair
24 Dec - 01 Jan Icelandair
18 Dec - 01 Jan TAP

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

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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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