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

Return flights

03 Dec - 12 Dec	TAP
10 Dec - 19 Dec	TAP
04 Dec - 13 Dec	Icelandair
12 Dec - 26 Dec	TAP
02 Dec - 16 Dec	Aer Lingus
01 Dec - 10 Dec	Scandinavian Airlines
14 Dec - 30 Dec	TAP
12 Dec - 20 Dec	TAP
11 Dec - 20 Dec	Scandinavian Airlines
15 Dec - 10 Jan	Scandinavian Airlines
14 Dec - 15 Dec	Spirit Airlines
13 Dec - 10 Jan	Icelandair
10 Dec - 03 Jan	Frontier Airlines
24 Dec - 03 Jan	Scandinavian Airlines
16 Dec - 06 Jan	Spirit Airlines
13 Dec - 10 Jan	Lufthansa	direct
25 Dec - 02 Jan	Scandinavian Airlines
15 Dec - 10 Jan	Lufthansa	direct
16 Dec - 06 Jan	United	direct
25 Dec - 05 Jan	Lufthansa	direct

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 391€

Return flights