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

Return flights

25 Oct - 08 Nov	Scandinavian Airlines
28 Oct - 11 Nov	Icelandair
02 Oct - 05 Oct	Scandinavian Airlines
10 Oct - 17 Oct	Icelandair
15 Oct - 22 Oct	Icelandair
30 Oct - 06 Nov	Icelandair
05 Oct - 12 Oct	Icelandair
02 Oct - 07 Oct	Turkish Airlines
02 Oct - 09 Oct	TAP
28 Oct - 11 Nov	Lufthansa	direct
20 Oct - 27 Oct	Icelandair
15 Oct - 22 Oct	Lufthansa	direct
30 Oct - 06 Nov	Lufthansa	direct
10 Oct - 17 Oct	Lufthansa	direct
20 Oct - 27 Oct	Lufthansa	direct
25 Oct - 01 Nov	Lufthansa	direct
25 Oct - 08 Nov	Lufthansa	direct

Also check the deals for one-way flights from Chicago to Frankfurt in October.

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 October from $557

Return flights