AirHint found the following cheapest return flights from Denver (DEN) to Zurich (ZRH) in September 2025 (see full year).

Return flights

17 Sep - 24 Sep	Icelandair
10 Sep - 16 Sep	Icelandair
14 Sep - 23 Sep	Icelandair
18 Sep - 29 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
02 Sep - 09 Sep	United
29 Sep - 04 Oct	Icelandair
14 Sep - 21 Sep	United
26 Sep - 03 Oct	Icelandair
20 Sep - 27 Sep	United

Also check the deals for one-way flights from Denver to Zurich in September.

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 Zurich in September from $506

Return flights