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

Return flights

11 Oct - 13 Oct	Air Canada
04 Oct - 11 Oct	TAP
25 Oct - 02 Nov	TAP
29 Oct - 12 Nov	TAP
17 Oct - 19 Oct	Iberia
13 Oct - 08 Nov	TAP
27 Oct - 22 Nov	TAP
14 Oct - 21 Oct	TAP
14 Oct - 08 Nov	TAP
15 Oct - 08 Nov	TAP
17 Oct - 08 Nov	TAP
18 Oct - 08 Nov	TAP
20 Oct - 15 Nov	TAP
16 Oct - 08 Nov	TAP
07 Oct - 14 Oct	Lufthansa
08 Oct - 19 Oct	Lufthansa
21 Oct - 28 Oct	Lufthansa
23 Oct - 27 Oct	Lufthansa
05 Oct - 09 Oct	Lufthansa
14 Oct - 17 Oct	jetBlue

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 331€

Return flights