Cheapest return flights from Chicago to London in December from 648€

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

23 Dec - 30 Dec Air Canada
14 Dec - 29 Dec Air Canada
27 Dec - 09 Jan Icelandair
27 Dec - 09 Jan British Airways direct
22 Dec - 31 Dec Austrian Airlines
23 Dec - 31 Dec United
22 Dec - 29 Dec SWISS
22 Dec - 29 Dec Iberia direct
20 Dec - 03 Jan TAP
23 Dec - 31 Dec British Airways direct
20 Dec - 03 Jan British Airways direct
22 Dec - 02 Jan Finnair

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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