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Cheap flights from Chicago (CHI) to Denver (DEN)

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0 Children (2~11)
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How to find the cheapest flight from Chicago (CHI) to Denver (DEN)

How to find the cheapest flight from Chicago (CHI) to Denver (DEN)
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How to find the cheapest flight from Chicago (CHI) to Denver (DEN)
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How to find the cheapest flight from Chicago (CHI) to Denver (DEN)
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Cheap flights from Chicago to Denver in September , October 2026

26 Sep - 10 Oct $ 139.00
CHI
Chicago
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
CHI
Chicago
Pick dates
09 Sep - 10 Oct $ 209.00
CHI
Chicago
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
CHI
Chicago
Pick dates
09 Sep - 03 Oct $ 263.00
CHI
Chicago
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
CHI
Chicago
Pick dates

Last minute flights from Chicago to Denver

26 Sep - 30 Sep $ 197.00
CHI
Chicago
Frontier Airlines
DIRECT
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
CHI
Chicago
Pick dates
14 Sep - 30 Sep $ 256.00
CHI
Chicago
Frontier Airlines
1 STOPS
DEN
Denver
DEN
Denver
Frontier Airlines
DIRECT
CHI
Chicago
Pick dates
10 Sep - 30 Sep $ 485.00
CHI
Chicago
United Airlines
DIRECT
DEN
Denver
DEN
Denver
United Airlines
DIRECT
CHI
Chicago
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One-way flights to Denver from Chicago

6:30 AM - 6:30 AM
Frontier Airlines
0 Stops
2h 45m
CHI - DEN
$ 98
Kiwi
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5:55 AM - 10:40 AM
Frontier Airlines
1 Stops
7h 4m
CHI - DEN
$ 157
Kiwi
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5:00 AM - 5:00 AM
United Airlines
0 Stops
2h 39m
CHI - DEN
$ 259
Kiwi
Pick dates

How to find the cheapest flight from Chicago (CHI) to Denver (DEN)

Related info for your journey
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How to find the cheapest flight from Chicago (CHI) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Denver (DEN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.