Cheapest return flights from Chicago to London in December from $545

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

Return flights

02 Dec - 09 Dec Frontier Airlines
04 Dec - 09 Dec Frontier Airlines
25 Dec - 17 Jan Frontier Airlines
27 Dec - 17 Jan Frontier Airlines
07 Dec - 13 Dec Frontier Airlines
30 Dec - 07 Jan Frontier Airlines
05 Dec - 23 Dec Frontier Airlines
23 Dec - 11 Jan Frontier Airlines
14 Dec - 18 Dec Frontier Airlines
27 Dec - 12 Jan Frontier Airlines
09 Dec - 02 Jan Frontier Airlines
18 Dec - 06 Jan Frontier Airlines
23 Dec - 07 Jan Frontier Airlines
12 Dec - 04 Jan Southwest Airlines
18 Dec - 28 Dec Southwest Airlines
22 Dec - 01 Jan Southwest Airlines
19 Dec - 21 Dec Southwest Airlines
20 Dec - 23 Dec Southwest Airlines

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

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