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

Return flights

05 Dec - 13 Dec	TAP
10 Dec - 16 Dec	Icelandair
03 Dec - 31 Jan	Air France
01 Dec - 08 Dec	Air France
02 Dec - 09 Dec	Air France
03 Dec - 12 Dec	Air France
03 Dec - 09 Dec	Air France
04 Dec - 13 Dec	Delta
15 Dec - 15 Jan	Aer Lingus
27 Dec - 10 Jan	Air Serbia
12 Dec - 16 Dec	Aer Lingus
28 Dec - 11 Jan	Scandinavian Airlines
11 Dec - 09 Jan	Spirit Airlines
10 Dec - 19 Dec	Scandinavian Airlines
10 Dec - 11 Dec	Aer Lingus
16 Dec - 06 Jan	Frontier Airlines
12 Dec - 04 Jan	Frontier Airlines
28 Dec - 04 Jan	Lufthansa
15 Dec - 01 Jan	Frontier Airlines
12 Dec - 05 Jan	Aer Lingus

Also check the deals for one-way flights from Chicago to Frankfurt 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 Frankfurt in December from $496

Return flights