Flights from St. Louis to North Central Colorado

Cheapest flights from St. Louis

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$118 Roundtrip, found 11 hours ago

$118

Roundtrip

found 11 hours ago

Select Frontier Airlines flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $118 found 11 hours ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$129 Roundtrip, found 4 days ago

$129

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $129 found 4 days ago

Thu, Sep 25 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$133 Roundtrip, found 4 days ago

$133

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $133 found 4 days ago

Fri, Sep 26 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$138 Roundtrip, found 4 days ago

$138

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $138 found 4 days ago

Fri, Sep 26 - Mon, Oct 6

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$143 Roundtrip, found 4 days ago

$143

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Oct 6, priced at $143 found 4 days ago

Mon, Aug 18 - Sat, Aug 23

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$146 Roundtrip, found 11 hours ago

$146

Roundtrip

found 11 hours ago

Select Frontier Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Aug 23, priced at $146 found 11 hours ago

Fri, Sep 26 - Sun, Oct 5

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$149 Roundtrip, found 4 days ago

$149

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Sun, Oct 5, priced at $149 found 4 days ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$152 Roundtrip, found 11 hours ago

$152

Roundtrip

found 11 hours ago

Select United flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $152 found 11 hours ago

Fri, Jul 25 - Wed, Aug 13

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$155 Roundtrip, found 2 days ago

$155

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jul 25 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Aug 13, priced at $155 found 2 days ago

Mon, Aug 18 - Fri, Aug 22

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$157 Roundtrip, found 11 hours ago

$157

Roundtrip

found 11 hours ago

Select Frontier Airlines flight, departing Mon, Aug 18 from Lambert-St. Louis Intl. to Denver Intl., returning Fri, Aug 22, priced at $157 found 11 hours ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$157 Roundtrip, found 11 hours ago

$157

Roundtrip

found 11 hours ago

Select United flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $157 found 11 hours ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$162 Roundtrip, found 11 hours ago

$162

Roundtrip

found 11 hours ago

Select American Airlines flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $162 found 11 hours ago

Sun, Sep 28 - Tue, Oct 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$163 Roundtrip, found 4 days ago

$163

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Oct 7, priced at $163 found 4 days ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$167 Roundtrip, found 11 hours ago

$167

Roundtrip

found 11 hours ago

Select United flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $167 found 11 hours ago

Fri, Aug 22 - Sun, Aug 24

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$168 Roundtrip, found 11 hours ago

$168

Roundtrip

found 11 hours ago

Select Frontier Airlines flight, departing Fri, Aug 22 from Lambert-St. Louis Intl. to Denver Intl., returning Sun, Aug 24, priced at $168 found 11 hours ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$172 Roundtrip, found 11 hours ago

$172

Roundtrip

found 11 hours ago

Select Delta flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $172 found 11 hours ago

Fri, Sep 26 - Thu, Oct 9

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$173 Roundtrip, found 4 days ago

$173

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Thu, Oct 9, priced at $173 found 4 days ago

Wed, Aug 20 - Mon, Aug 25

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$177 Roundtrip, found 11 hours ago

$177

Roundtrip

found 11 hours ago

Select American Airlines flight, departing Wed, Aug 20 from Lambert-St. Louis Intl. to Denver Intl., returning Mon, Aug 25, priced at $177 found 11 hours ago

Mon, Sep 29 - Thu, Oct 2

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$177 Roundtrip, found 4 days ago

$177

Roundtrip

found 4 days ago

Select Delta flight, departing Mon, Sep 29 from Lambert-St. Louis Intl. to Denver Intl., returning Thu, Oct 2, priced at $177 found 4 days ago

Fri, Sep 26 - Thu, Oct 9

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$183 Roundtrip, found 4 days ago

$183

Roundtrip

found 4 days ago

Select United flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Thu, Oct 9, priced at $183 found 4 days ago