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

Return flights

01 Dec - 06 Dec	Iberia
04 Dec - 07 Dec	TAP
03 Dec - 10 Dec	Icelandair
13 Dec - 27 Dec	Iberia
09 Dec - 16 Dec	Icelandair
16 Dec - 14 Jan	Icelandair
30 Dec - 06 Jan	Icelandair
11 Dec - 15 Dec	SWISS
23 Dec - 01 Jan	Icelandair
23 Dec - 02 Jan	Icelandair
22 Dec - 30 Dec	Icelandair
21 Dec - 28 Dec	Icelandair
21 Dec - 02 Jan	Icelandair
22 Dec - 02 Jan	Icelandair
28 Dec - 04 Jan	Icelandair
29 Dec - 04 Jan	Icelandair
27 Dec - 02 Jan	Icelandair
25 Dec - 01 Jan	Icelandair
23 Dec - 27 Dec	Icelandair
18 Dec - 26 Dec	Icelandair

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

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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Cheapest return flights from Boston to London in December from 358€

Return flights