Cheapest return flights from Chicago to London in September from 540€

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

Return flights

10 Sep - 17 Sep Finnair
17 Sep - 24 Sep Finnair
23 Sep - 12 Oct Finnair
02 Sep - 11 Sep Delta
10 Sep - 17 Sep British Airways direct
17 Sep - 24 Sep British Airways direct
23 Sep - 12 Oct British Airways direct
02 Sep - 11 Sep British Airways direct

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

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