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

Return flights

29 Jul - 05 Aug	jetBlue
30 Jul - 06 Aug	jetBlue
27 Jul - 12 Aug	ITA Airways
30 Jul - 05 Aug	SWISS
31 Jul - 07 Aug	SWISS
28 Jul - 08 Aug	jetBlue
31 Jul - 12 Aug	Icelandair
31 Jul - 10 Aug	jetBlue
31 Jul - 03 Aug	Frontier Airlines
28 Jul - 02 Aug	TAP
27 Jul - 31 Jul	TAP

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 637€

Return flights