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

Return flights

15 Oct - 16 Nov	Icelandair
12 Oct - 12 Nov	Icelandair
20 Oct - 03 Nov	Icelandair
21 Oct - 15 Nov	Icelandair
19 Oct - 08 Nov	Icelandair
16 Oct - 13 Nov	Icelandair
26 Oct - 15 Nov	Icelandair
15 Oct - 08 Nov	Icelandair
17 Oct - 08 Nov	Icelandair
05 Oct - 14 Oct	Icelandair
12 Oct - 01 Nov	Icelandair
25 Oct - 30 Oct	Icelandair
12 Oct - 29 Oct	Icelandair
16 Oct - 22 Oct	Icelandair
16 Oct - 30 Oct	Icelandair
25 Oct - 27 Oct	Scandinavian Airlines
21 Oct - 28 Oct	Scandinavian Airlines
22 Oct - 29 Oct	Scandinavian Airlines
22 Oct - 31 Oct	Scandinavian Airlines
06 Oct - 14 Oct	Icelandair

Also check the deals for one-way flights from Chicago 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 Chicago to London in October from $513

Return flights