Cheapest return flights from Chicago to London in September from $553

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

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

Return flights

26 Sep - 12 Oct Icelandair
21 Sep - 28 Sep Icelandair
19 Sep - 23 Sep Icelandair
24 Sep - 08 Oct Icelandair
12 Sep - 04 Oct Icelandair
24 Sep - 28 Sep Icelandair
19 Sep - 28 Sep Icelandair
19 Sep - 25 Sep Icelandair
06 Sep - 14 Sep Icelandair
15 Sep - 25 Sep Icelandair
12 Sep - 15 Sep Icelandair
05 Sep - 09 Sep Icelandair
04 Sep - 10 Sep Icelandair
28 Sep - 10 Oct Icelandair
11 Sep - 04 Oct Spirit Airlines

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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