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

Return flights

11 Oct - 22 Oct	TAP
19 Oct - 08 Nov	TAP
24 Oct - 15 Nov	TAP
28 Oct - 04 Nov	Air Canada
14 Oct - 21 Oct	Air Canada
15 Oct - 23 Oct	Air Canada
19 Oct - 02 Nov	Icelandair
20 Oct - 31 Oct	Icelandair
08 Oct - 15 Oct	Lufthansa
21 Oct - 18 Nov	Aer Lingus
06 Oct - 12 Nov	Aer Lingus
06 Oct - 15 Oct	Aer Lingus
01 Oct - 15 Oct	Aer Lingus
07 Oct - 16 Oct	Aer Lingus
12 Oct - 21 Oct	Aer Lingus
08 Oct - 17 Oct	Air Canada
21 Oct - 18 Nov	British Airways	direct
06 Oct - 12 Nov	British Airways	direct
28 Oct - 04 Nov	British Airways	direct
20 Oct - 15 Nov	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 384€

Return flights