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

Return flights

20 Oct - 03 Nov	Icelandair
19 Oct - 04 Nov	Icelandair
20 Oct - 05 Nov	Icelandair
27 Oct - 03 Nov	Icelandair
30 Oct - 06 Nov	Icelandair
12 Oct - 19 Oct	Icelandair
15 Oct - 19 Oct	Icelandair
01 Oct - 15 Oct	Icelandair
20 Oct - 27 Oct	Icelandair
16 Oct - 23 Oct	Icelandair
15 Oct - 22 Oct	Icelandair
11 Oct - 01 Nov	TAP
06 Oct - 01 Nov	Scandinavian Airlines
01 Oct - 25 Oct	Frontier Airlines
24 Oct - 07 Nov	TAP
26 Oct - 31 Oct	Scandinavian Airlines
14 Oct - 19 Oct	Icelandair
24 Oct - 06 Nov	TAP
24 Oct - 14 Nov	TAP
06 Oct - 15 Oct	Turkish Airlines

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 $484

Return flights