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

Return flights

21 Oct - 28 Oct	Spirit Airlines
24 Oct - 07 Nov	Aer Lingus
30 Oct - 13 Nov	Scandinavian Airlines
15 Oct - 22 Oct	Frontier Airlines
02 Oct - 06 Oct	Spirit Airlines
27 Oct - 10 Nov	Aer Lingus
15 Oct - 25 Oct	Frontier Airlines
03 Oct - 19 Oct	Icelandair
29 Oct - 05 Nov	Icelandair
29 Oct - 05 Nov	Lufthansa	direct
10 Oct - 19 Oct	Icelandair
09 Oct - 16 Oct	Icelandair
12 Oct - 19 Oct	Icelandair
21 Oct - 28 Oct	Lufthansa	direct
15 Oct - 22 Oct	Lufthansa	direct
24 Oct - 07 Nov	Lufthansa	direct
27 Oct - 10 Nov	Lufthansa	direct
30 Oct - 13 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 532€

Return flights