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

Return flights

04 Oct - 15 Oct	Spirit Airlines
08 Oct - 14 Oct	Icelandair
01 Oct - 27 Nov	Icelandair
01 Oct - 10 Nov	Icelandair
01 Oct - 08 Oct	Spirit Airlines
06 Oct - 09 Oct	Spirit Airlines
02 Oct - 06 Oct	Spirit Airlines
03 Oct - 06 Oct	Spirit Airlines
01 Oct - 20 Oct	Icelandair
01 Oct - 11 Oct	Icelandair
16 Oct - 22 Oct	Spirit Airlines
08 Oct - 15 Oct	Spirit Airlines
28 Oct - 04 Nov	Aer Lingus
24 Oct - 06 Nov	Spirit Airlines
01 Oct - 09 Nov	Icelandair
26 Oct - 05 Nov	SWISS
30 Oct - 06 Nov	SWISS
30 Oct - 04 Nov	SWISS

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 391€

Return flights