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

Return flights

08 Oct - 21 Oct	Icelandair
15 Oct - 21 Oct	Icelandair
21 Oct - 27 Oct	Icelandair
01 Oct - 01 Nov	Icelandair
03 Oct - 06 Oct	Icelandair
05 Oct - 10 Oct	Icelandair
16 Oct - 31 Oct	Spirit Airlines
01 Oct - 08 Oct	Spirit Airlines
17 Oct - 28 Oct	Spirit Airlines
24 Oct - 28 Oct	Spirit Airlines
02 Oct - 08 Oct	Spirit Airlines
04 Oct - 08 Nov	Icelandair
17 Oct - 02 Nov	Icelandair
28 Oct - 01 Nov	Icelandair
25 Oct - 01 Nov	Scandinavian Airlines
24 Oct - 09 Nov	Spirit Airlines
30 Oct - 02 Nov	SWISS
30 Oct - 13 Nov	SWISS
27 Oct - 10 Nov	SWISS
27 Oct - 06 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Chicago to London in October from 406€

Return flights