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

One-Way flights

01 Dec	WestJet
03 Dec	Frontier Airlines
12 Dec	Frontier Airlines
10 Dec	Frontier Airlines
16 Dec	jetBlue
29 Dec	Air Canada
29 Dec	Lufthansa	direct
28 Dec	Air Canada
15 Dec	Scandinavian Airlines
07 Dec	British Airways	direct

Also check the deals for return 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 one-way flights from Chicago to London in December from 194€

One-Way flights