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

Return flights

11 Aug - 26 Aug	Finnair
11 Aug - 26 Aug	British Airways	direct
11 Aug - 01 Sep	British Airways	direct
21 Aug - 24 Aug	SWISS
20 Aug - 03 Sep	Finnair
17 Aug - 31 Aug	British Airways	direct
01 Aug - 09 Aug	Air Canada
21 Aug - 24 Aug	British Airways	direct
03 Aug - 05 Aug	Finnair
07 Aug - 09 Aug	Austrian Airlines
07 Aug - 09 Aug	British Airways	direct
03 Aug - 05 Aug	British Airways	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 435€

Return flights