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

Return flights

14 Oct - 28 Oct	Icelandair
07 Oct - 27 Oct	Scandinavian Airlines
13 Oct - 23 Oct	WestJet
08 Oct - 21 Oct	Frontier Airlines
13 Oct - 08 Nov	WestJet
12 Oct - 22 Oct	Aer Lingus
11 Oct - 01 Nov	Frontier Airlines
14 Oct - 23 Oct	Frontier Airlines
01 Oct - 15 Oct	Frontier Airlines
12 Oct - 23 Oct	WestJet
16 Oct - 30 Oct	Frontier Airlines
07 Oct - 14 Oct	Frontier Airlines
30 Oct - 06 Nov	Icelandair
13 Oct - 08 Nov	Lufthansa	direct
26 Oct - 02 Nov	Lufthansa	direct
30 Oct - 06 Nov	Lufthansa	direct
11 Oct - 01 Nov	Lufthansa	direct

Also check the deals for one-way flights from Denver 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 Denver to Frankfurt in October from $528

Return flights