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

Return flights

09 Sep - 30 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
09 Sep - 16 Sep	Icelandair
30 Sep - 07 Oct	Icelandair
27 Sep - 04 Oct	Icelandair
29 Sep - 13 Oct	Icelandair
23 Sep - 30 Sep	Icelandair
18 Sep - 25 Sep	Icelandair
05 Sep - 14 Sep	Icelandair
21 Sep - 05 Oct	Icelandair
18 Sep - 22 Sep	Icelandair
22 Sep - 29 Sep	Frontier Airlines
12 Sep - 19 Sep	Frontier Airlines
15 Sep - 15 Oct	Frontier Airlines
28 Sep - 12 Oct	Frontier Airlines
24 Sep - 01 Oct	Icelandair
03 Sep - 10 Sep	Icelandair
08 Sep - 07 Oct	Air Canada
30 Sep - 07 Oct	Air France	direct
21 Sep - 05 Oct	Delta	direct

Also check the deals for one-way flights from Denver to Paris 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 Paris in September from 426€

Return flights