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

Return flights

25 Oct - 22 Nov	TAP
22 Oct - 15 Nov	Frontier Airlines
28 Oct - 04 Nov	Spirit Airlines
21 Oct - 28 Oct	Air Canada
20 Oct - 29 Oct	SWISS
23 Oct - 15 Nov	TAP
26 Oct - 03 Nov	SWISS
27 Oct - 04 Nov	Spirit Airlines
24 Oct - 15 Nov	Frontier Airlines
26 Oct - 04 Nov	SWISS
28 Oct - 22 Nov	Frontier Airlines
21 Oct - 15 Nov	Frontier Airlines
22 Oct - 28 Oct	Frontier Airlines
20 Oct - 28 Oct	SWISS
26 Oct - 30 Oct	TAP
24 Oct - 28 Oct	Frontier Airlines
23 Oct - 28 Oct	Spirit Airlines
25 Oct - 29 Oct	Frontier Airlines
18 Oct - 23 Oct	Spirit Airlines
18 Oct - 22 Oct	Spirit Airlines

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 464€

Return flights