AirHint found the following cheapest return flights from Chicago (MDW) to London (LGW) in January 2026 (see full year).

Return flights

23 Jan - 30 Jan	Frontier Airlines
23 Jan - 26 Jan	Frontier Airlines
30 Jan - 02 Feb	Frontier Airlines
15 Jan - 21 Jan	Frontier Airlines
15 Jan - 20 Jan	Frontier Airlines
25 Jan - 01 Feb	Southwest Airlines
10 Jan - 16 Jan	Southwest Airlines
24 Jan - 31 Jan	Porter Airlines (Canada) Ltd
05 Jan - 11 Jan	Frontier Airlines

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

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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Cheapest return flights from Chicago to London in January from $559

Return flights