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

Return flights

29 Oct - 08 Nov	TAP
26 Oct - 15 Nov	TAP
08 Oct - 15 Oct	Spirit Airlines
07 Oct - 14 Oct	Spirit Airlines
12 Oct - 31 Oct	Icelandair
28 Oct - 04 Nov	Aer Lingus
01 Oct - 15 Oct	Spirit Airlines
08 Oct - 01 Nov	Spirit Airlines
06 Oct - 01 Nov	Frontier Airlines
10 Oct - 21 Oct	WestJet
01 Oct - 08 Oct	Spirit Airlines
01 Oct - 25 Oct	Spirit Airlines
10 Oct - 20 Oct	WestJet
05 Oct - 25 Oct	Spirit Airlines
02 Oct - 25 Oct	Spirit Airlines
30 Oct - 06 Nov	Icelandair
28 Oct - 04 Nov	Lufthansa	direct
26 Oct - 02 Nov	Lufthansa	direct
30 Oct - 06 Nov	Lufthansa	direct
23 Oct - 05 Nov	United	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 463€

Return flights