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

30 Sep - 06 Oct Icelandair
28 Sep - 05 Oct Icelandair
02 Sep - 13 Sep Icelandair
24 Sep - 30 Sep Icelandair
30 Sep - 05 Oct Icelandair
02 Sep - 06 Sep Icelandair
07 Sep - 16 Sep Icelandair
10 Sep - 19 Sep Spirit Airlines
26 Sep - 05 Oct Icelandair
14 Sep - 30 Sep Icelandair
23 Sep - 02 Oct Icelandair
09 Sep - 19 Sep Icelandair
01 Sep - 09 Sep Icelandair
13 Sep - 21 Sep Icelandair
01 Sep - 22 Sep Icelandair
27 Sep - 10 Oct British Airways
25 Sep - 06 Oct Spirit Airlines
27 Sep - 04 Oct Spirit Airlines
17 Sep - 01 Oct Icelandair
30 Sep - 16 Oct SWISS

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.

Book a cheap hotel in London

Cheap car rent in London