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

Return flights

16 Oct - 22 Oct	SWISS
08 Oct - 21 Oct	Virgin Atlantic
08 Oct - 22 Oct	Lufthansa
01 Oct - 07 Oct	Lufthansa
01 Oct - 15 Oct	Lufthansa
11 Oct - 28 Oct	Air Canada
01 Oct - 01 Nov	Icelandair
15 Oct - 21 Oct	Air Canada
23 Oct - 26 Oct	Scandinavian Airlines
01 Oct - 09 Oct	Lufthansa
14 Oct - 20 Oct	SWISS
29 Oct - 05 Nov	British Airways	direct
25 Oct - 01 Nov	Air Canada
31 Oct - 08 Nov	TAP
28 Oct - 01 Nov	Icelandair
30 Oct - 07 Nov	Delta
26 Oct - 03 Nov	Air France
26 Oct - 03 Nov	British Airways	direct
30 Oct - 02 Nov	SWISS
25 Oct - 01 Nov	American Airlines	direct

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 310€

Return flights