Cheapest return flights from London to Chicago in September from $473

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

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

Return flights

13 Sep - 01 Oct Icelandair
10 Sep - 01 Oct Icelandair
01 Sep - 24 Sep Icelandair
12 Sep - 20 Sep Icelandair
03 Sep - 08 Sep Icelandair
05 Sep - 24 Sep Icelandair
13 Sep - 19 Sep Icelandair
05 Sep - 19 Sep Icelandair
21 Sep - 30 Sep Icelandair
24 Sep - 30 Sep Icelandair
08 Sep - 22 Sep Icelandair
11 Sep - 18 Sep Icelandair
21 Sep - 08 Oct Icelandair
19 Sep - 08 Oct Icelandair
15 Sep - 08 Oct Icelandair
26 Sep - 07 Oct Icelandair
25 Sep - 02 Oct Icelandair
16 Sep - 07 Oct SWISS
26 Sep - 05 Oct Icelandair
27 Sep - 04 Oct Icelandair

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