Cheapest return flights from Denver to Chicago in September from $107

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

Return flights

17 Sep - 20 Sep Frontier Airlines direct
10 Sep - 15 Sep Frontier Airlines direct
22 Sep - 27 Sep Frontier Airlines direct
21 Sep - 25 Sep Frontier Airlines direct
05 Sep - 07 Sep Frontier Airlines direct
26 Sep - 30 Sep American Airlines direct
14 Sep - 22 Sep Sun Country Airlines
05 Sep - 22 Sep Sun Country Airlines
05 Sep - 12 Sep Sun Country Airlines
21 Sep - 22 Sep Sun Country Airlines

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

Skyscanner

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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