Cheapest return flights from London to Boston in December from $506

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

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

Return flights

04 Dec - 07 Dec SWISS
03 Dec - 06 Dec SWISS
16 Dec - 30 Dec SWISS
16 Dec - 04 Jan Delta
01 Dec - 12 Dec British Airways
17 Dec - 31 Dec SWISS
21 Dec - 04 Jan KLM
15 Dec - 22 Dec British Airways
23 Dec - 28 Dec SWISS
28 Dec - 11 Jan SWISS
26 Dec - 03 Jan SWISS
23 Dec - 30 Dec SWISS
23 Dec - 04 Jan SWISS
28 Dec - 04 Jan KLM
25 Dec - 01 Jan SWISS
18 Dec - 05 Jan SWISS
19 Dec - 19 Jan SWISS
27 Dec - 03 Jan SWISS
20 Dec - 28 Dec SWISS
13 Dec - 20 Dec SWISS

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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