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

Return flights

10 Oct - 12 Oct	Iberia
02 Oct - 05 Oct	Iberia
31 Oct - 02 Nov	Iberia
20 Oct - 15 Nov	TAP
21 Oct - 15 Nov	TAP
17 Oct - 08 Nov	TAP
18 Oct - 08 Nov	TAP
16 Oct - 08 Nov	TAP
19 Oct - 08 Nov	TAP
15 Oct - 21 Oct	TAP
15 Oct - 08 Nov	TAP
14 Oct - 08 Nov	TAP
30 Oct - 02 Nov	TAP
19 Oct - 31 Oct	Aer Lingus
17 Oct - 26 Oct	Aer Lingus
11 Oct - 18 Oct	Aer Lingus
16 Oct - 24 Oct	Aer Lingus
06 Oct - 12 Oct	Aer Lingus
10 Oct - 20 Oct	Aer Lingus
06 Oct - 19 Oct	Aer Lingus

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 $389

Return flights