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

Return flights

28 Jul - 31 Jul	jetBlue
28 Jul - 04 Aug	jetBlue
29 Jul - 05 Aug	jetBlue
30 Jul - 06 Aug	Lufthansa
28 Jul - 08 Aug	Lufthansa
29 Jul - 12 Aug	Lufthansa
29 Jul - 05 Aug	Lufthansa	direct
28 Jul - 08 Aug	Lufthansa	direct
29 Jul - 12 Aug	Lufthansa	direct
31 Jul - 07 Aug	Lufthansa
31 Jul - 08 Aug	Lufthansa
29 Jul - 31 Jul	jetBlue
27 Jul - 31 Jul	TAP
29 Jul - 31 Jul	Lufthansa	direct
28 Jul - 31 Jul	Lufthansa	direct
27 Jul - 31 Jul	British Airways	direct

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 666€

Return flights