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

Return flights

12 Sep - 19 Sep	Air Canada
11 Sep - 18 Sep	Aer Lingus
03 Sep - 11 Sep	Lufthansa
09 Sep - 16 Sep	Lufthansa
08 Sep - 15 Sep	Lufthansa
09 Sep - 16 Sep	Lufthansa	direct
01 Sep - 12 Sep	Lufthansa	direct
13 Sep - 27 Sep	Frontier Airlines
17 Sep - 24 Sep	Air Canada
18 Sep - 21 Sep	Frontier Airlines
26 Sep - 04 Oct	Icelandair
17 Sep - 01 Oct	Frontier Airlines
17 Sep - 01 Oct	Lufthansa	direct
26 Sep - 04 Oct	Lufthansa	direct
25 Sep - 03 Oct	Lufthansa	direct

Also check the deals for one-way flights from Denver to Munich 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 Munich in September from 552€

Return flights