Cheapest return flights from Chicago to London in December from $525

Best time to book flights for Chicago (ORD) to London (LHR) flights at AirHint

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

Return flights

05 Dec - 11 Dec Icelandair
04 Dec - 10 Dec Icelandair
11 Dec - 25 Dec Icelandair
28 Dec - 10 Jan Scandinavian Airlines
11 Dec - 19 Dec Icelandair
09 Dec - 16 Dec Delta
03 Dec - 10 Dec Delta
02 Dec - 09 Dec Delta
26 Dec - 11 Jan Scandinavian Airlines
06 Dec - 14 Dec Icelandair
08 Dec - 15 Dec Icelandair
10 Dec - 17 Dec Delta
31 Dec - 07 Jan Delta
28 Dec - 10 Jan British Airways direct
26 Dec - 01 Jan Air Canada
26 Dec - 11 Jan British Airways direct
19 Dec - 09 Jan Icelandair
19 Dec - 09 Jan Iberia direct
26 Dec - 03 Jan Scandinavian Airlines
26 Dec - 02 Jan Scandinavian Airlines

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

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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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