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

Return flights

01 Dec - 10 Dec	Icelandair
03 Dec - 11 Dec	Icelandair
03 Dec - 07 Dec	Icelandair
15 Dec - 10 Jan	Finnair
16 Dec - 10 Jan	Finnair
14 Dec - 10 Jan	Finnair
16 Dec - 09 Jan	Finnair
14 Dec - 08 Jan	Finnair
22 Dec - 29 Dec	Icelandair
28 Dec - 10 Jan	Finnair
18 Dec - 02 Jan	TAP
19 Dec - 02 Jan	Finnair
17 Dec - 10 Jan	Finnair
17 Dec - 09 Jan	Finnair

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 584€

Return flights