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

Return flights

07 Oct - 15 Oct	SWISS
06 Oct - 13 Oct	SWISS
01 Oct - 07 Oct	SWISS
08 Oct - 15 Oct	SWISS
09 Oct - 22 Oct	SWISS
07 Oct - 20 Oct	SWISS
03 Oct - 06 Oct	SWISS
08 Oct - 16 Oct	SWISS
29 Oct - 04 Nov	SWISS
04 Oct - 08 Oct	SWISS
09 Oct - 12 Oct	SWISS
31 Oct - 10 Nov	SWISS
31 Oct - 18 Nov	SWISS
15 Oct - 10 Nov	SWISS
29 Oct - 05 Nov	KLM
28 Oct - 12 Nov	SWISS
29 Oct - 02 Nov	SWISS
27 Oct - 03 Nov	Delta
30 Oct - 06 Nov	SWISS
15 Oct - 13 Nov	SWISS

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

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 London to Boston in October from $517

Return flights