Cheapest one-way flights from Chicago to London in September from 182€

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

One-Way flights

28 Sep Frontier Airlines
21 Sep Frontier Airlines
29 Sep Frontier Airlines
26 Sep Frontier Airlines
22 Sep Frontier Airlines
08 Sep Frontier Airlines
20 Sep Frontier Airlines
07 Sep Frontier Airlines
05 Sep Frontier Airlines
06 Sep Porter Airlines (Canada) Ltd

Also check the deals for return 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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