Cheapest return flights from Boston to London in December from $620

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

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

Return flights

02 Dec - 09 Dec SWISS
09 Dec - 16 Dec SWISS
01 Dec - 08 Dec SWISS
01 Dec - 04 Dec SWISS
02 Dec - 05 Dec SWISS
09 Dec - 12 Dec SWISS
03 Dec - 10 Dec SWISS
08 Dec - 15 Dec SWISS
31 Dec - 07 Jan Lufthansa
07 Dec - 10 Dec SWISS
06 Dec - 09 Dec SWISS
29 Dec - 05 Jan SWISS
30 Dec - 06 Jan SWISS
29 Dec - 01 Jan KLM
30 Dec - 02 Jan Delta
19 Dec - 06 Jan ITA Airways
25 Dec - 03 Jan Aer Lingus
31 Dec - 03 Jan SWISS
29 Dec - 04 Jan SWISS
25 Dec - 01 Jan KLM

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