Cheapest return flights from Chicago to London in September from $533

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

13 Sep - 15 Sep Scandinavian Airlines
24 Sep - 01 Oct Icelandair
04 Sep - 18 Sep Icelandair
09 Sep - 23 Sep Icelandair
05 Sep - 15 Sep Icelandair
10 Sep - 15 Sep Icelandair
09 Sep - 24 Sep Icelandair
01 Sep - 07 Sep Icelandair
20 Sep - 05 Oct Icelandair
06 Sep - 15 Sep Icelandair
10 Sep - 18 Sep Icelandair
27 Sep - 10 Oct Icelandair
27 Sep - 01 Oct Icelandair
19 Sep - 22 Sep Icelandair
29 Sep - 06 Oct Icelandair
26 Sep - 05 Oct Icelandair
17 Sep - 01 Oct Icelandair
15 Sep - 20 Oct Icelandair
24 Sep - 01 Oct American Airlines direct
30 Sep - 07 Oct Delta

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

Skyscanner

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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