Cheapest return flights from Chicago to London in September from $561

Best time to book flights for Chicago (ORD) to London (LHR) flights at AirHint

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

Return flights

09 Sep - 23 Sep Scandinavian Airlines
09 Sep - 21 Sep Scandinavian Airlines
15 Sep - 22 Sep Scandinavian Airlines
23 Sep - 30 Sep Scandinavian Airlines
09 Sep - 14 Sep Scandinavian Airlines
18 Sep - 21 Sep Scandinavian Airlines
24 Sep - 03 Oct Icelandair
27 Sep - 04 Oct Icelandair
07 Sep - 30 Sep Icelandair
11 Sep - 30 Sep Icelandair
12 Sep - 01 Oct Icelandair
11 Sep - 01 Oct Icelandair
13 Sep - 30 Sep Icelandair
20 Sep - 27 Sep Icelandair
09 Sep - 05 Oct Scandinavian Airlines
26 Sep - 07 Oct Icelandair
18 Sep - 01 Oct Scandinavian Airlines
20 Sep - 18 Oct Icelandair
26 Sep - 03 Oct Icelandair
30 Sep - 07 Oct Delta

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

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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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