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

Return flights

03 Oct - 05 Oct	Air Canada
01 Oct - 08 Oct	Icelandair
03 Oct - 19 Oct	TAP
22 Oct - 29 Oct	Icelandair
28 Oct - 04 Nov	Icelandair
11 Oct - 18 Oct	TAP
04 Oct - 12 Oct	TAP
08 Oct - 15 Oct	TAP
10 Oct - 27 Oct	TAP
08 Oct - 21 Oct	TAP
09 Oct - 13 Oct	TAP
29 Oct - 05 Nov	TAP
20 Oct - 18 Nov	TAP
23 Oct - 01 Nov	TAP
25 Oct - 03 Nov	Icelandair
26 Oct - 03 Nov	Aer Lingus
28 Oct - 04 Nov	KLM	direct
29 Oct - 05 Nov	Air France	direct
25 Oct - 03 Nov	KLM	direct
20 Oct - 18 Nov	Air France	direct

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 $372

Return flights