AirHint found the following cheapest return flights from Chicago (ORD) to London (LHR) in August 2026 (see full year).

Return flights

10 Aug - 21 Aug	Aer Lingus
17 Aug - 25 Aug	Aer Lingus
03 Aug - 14 Aug	Aer Lingus
04 Aug - 18 Aug	Aer Lingus
10 Aug - 18 Aug	Aer Lingus
10 Aug - 21 Aug	British Airways	direct
12 Aug - 19 Aug	United	direct
17 Aug - 25 Aug	British Airways	direct
14 Aug - 17 Aug	Scandinavian Airlines
15 Aug - 18 Aug	Scandinavian Airlines
13 Aug - 05 Sep	United
13 Aug - 05 Sep	British Airways	direct
28 Aug - 06 Sep	Iberia	direct

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

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 August from 536€

Return flights