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

Return flights

11 Jul - 28 Aug	Spirit Airlines
25 Jul - 22 Aug	Spirit Airlines
08 Jul - 31 Aug	Spirit Airlines
29 Jul - 17 Aug	Spirit Airlines
30 Jul - 06 Aug	Icelandair
29 Jul - 13 Aug	Icelandair
30 Jul - 13 Aug	Icelandair
28 Jul - 03 Aug	Icelandair
30 Jul - 15 Aug	Icelandair
28 Jul - 15 Aug	Icelandair
21 Jul - 31 Jul	Icelandair
22 Jul - 29 Jul	Icelandair
23 Jul - 29 Jul	Spirit Airlines
16 Jul - 21 Jul	SWISS
16 Jul - 22 Jul	Delta
17 Jul - 22 Jul	Icelandair
22 Jul - 28 Jul	Spirit Airlines
15 Jul - 22 Jul	jetBlue
23 Jul - 28 Jul	Spirit Airlines
16 Jul - 24 Jul	Spirit Airlines

Also check the deals for one-way flights from Chicago to London in July.

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 July from 436€

Return flights