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

Return flights

15 Oct - 21 Oct	Air Canada
28 Oct - 31 Oct	Lufthansa
19 Oct - 24 Oct	Lufthansa
18 Oct - 24 Oct	Lufthansa
19 Oct - 26 Oct	Air Canada
27 Oct - 06 Nov	Lufthansa
24 Oct - 02 Nov	Lufthansa
28 Oct - 04 Nov	Lufthansa
22 Oct - 02 Nov	jetBlue
20 Oct - 02 Nov	jetBlue	direct
21 Oct - 28 Oct	Lufthansa
16 Oct - 22 Oct	Air Canada
16 Oct - 19 Oct	Air Canada
18 Oct - 30 Oct	jetBlue
17 Oct - 30 Oct	jetBlue
28 Oct - 02 Nov	Air Canada
24 Oct - 02 Nov	jetBlue	direct
23 Oct - 02 Nov	Lufthansa
22 Oct - 10 Nov	Air Canada
29 Oct - 06 Nov	Virgin Atlantic

Also check the deals for one-way flights from Boston to London 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 Boston to London in October from 399€

Return flights