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

Return flights

14 Sep - 23 Sep	Air Canada
17 Sep - 24 Sep	Air Canada
25 Sep - 02 Oct	Aer Lingus
05 Sep - 12 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
24 Sep - 29 Sep	Scandinavian Airlines
19 Sep - 26 Sep	Frontier Airlines
04 Sep - 11 Sep	Icelandair
06 Sep - 13 Sep	Icelandair
29 Sep - 06 Oct	Icelandair
08 Sep - 15 Sep	SWISS
15 Sep - 22 Sep	Icelandair
30 Sep - 07 Oct	Icelandair
26 Sep - 03 Oct	Icelandair
24 Sep - 01 Oct	Frontier Airlines
28 Sep - 05 Oct	Frontier Airlines
27 Sep - 04 Oct	Aer Lingus

Also check the deals for one-way flights from Denver to Milano 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 Milano in September from $532

Return flights