AirHint found the following cheapest one-way flights from Denver (DEN) to Chicago (ORD) in July 2025 (see full year).

One-Way flights

15 Jul	Frontier Airlines
22 Jul	Frontier Airlines
27 Jul	Frontier Airlines	direct
28 Jul	Frontier Airlines	direct
25 Jul	Frontier Airlines	direct
31 Jul	Frontier Airlines	direct
30 Jul	Frontier Airlines	direct
18 Jul	Frontier Airlines	direct
24 Jul	Frontier Airlines	direct
19 Jul	Frontier Airlines	direct

Also check the deals for return flights from Denver to Chicago in July.

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 one-way flights from Denver to Chicago in July from $82

One-Way flights