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

Return flights

24 Dec - 07 Jan	Delta
25 Dec - 07 Jan	Delta
01 Dec - 05 Dec	Virgin Atlantic
15 Dec - 22 Dec	Delta
26 Dec - 30 Dec	Delta
12 Dec - 19 Dec	Virgin Atlantic
12 Dec - 14 Dec	Virgin Atlantic
24 Dec - 06 Jan	Delta
22 Dec - 29 Dec	Delta
26 Dec - 31 Dec	Delta
26 Dec - 01 Jan	Virgin Atlantic
26 Dec - 02 Jan	Delta
24 Dec - 05 Jan	Delta
18 Dec - 11 Jan	Air France
21 Dec - 24 Dec	Delta
20 Dec - 17 Jan	KLM
27 Dec - 02 Jan	Delta
19 Dec - 26 Dec	Delta
28 Dec - 03 Jan	Delta
13 Dec - 26 Dec	Southwest Airlines

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

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 December from 652€

Return flights