Cheapest return flights from Chicago to London in September from 467€

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

Return flights

21 Sep - 28 Sep Frontier Airlines
22 Sep - 15 Oct Frontier Airlines
22 Sep - 16 Oct Frontier Airlines
14 Sep - 17 Sep Frontier Airlines
14 Sep - 21 Oct Frontier Airlines
13 Sep - 21 Sep Porter Airlines (Canada) Ltd
07 Sep - 21 Sep Porter Airlines (Canada) Ltd
02 Sep - 04 Sep Porter Airlines (Canada) Ltd
06 Sep - 18 Sep Porter Airlines (Canada) Ltd
03 Sep - 20 Sep Porter Airlines (Canada) Ltd
03 Sep - 06 Sep Porter Airlines (Canada) Ltd
02 Sep - 06 Sep Porter Airlines (Canada) Ltd
05 Sep - 07 Sep Porter Airlines (Canada) Ltd

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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