$79 Cheap Frontier Airlines flights St. Louis (STL) to Denver (DEN)

$79 Cheap Frontier Airlines flights St. Louis (STL) to Denver (DEN)

Prices were available within the past 7 days and start at $79 for one-way flights and $139 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 29 - Sun, Oct 5

STL

St. Louis

DEN

Denver

$139 Roundtrip, found 5 hours ago

$139

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Mon, Sep 29 from St. Louis to Denver, returning Sun, Oct 5, priced at $139 found 5 hours ago

Fri, Sep 26 - Thu, Oct 2

STL

St. Louis

DEN

Denver

$158 Roundtrip, found 3 days ago

$158

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Sep 26 from St. Louis to Denver, returning Thu, Oct 2, priced at $158 found 3 days ago

Mon, Sep 29 - Sun, Oct 5

STL

St. Louis

DEN

Denver

$188 Roundtrip, found 5 hours ago

$188

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Mon, Sep 29 from St. Louis to Denver, returning Sun, Oct 5, priced at $188 found 5 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

St. Louis

DEN

Denver

$188 Roundtrip, found 12 hours ago

$188

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Wed, Jul 23 from St. Louis to Denver, returning Wed, Jul 30, priced at $188 found 12 hours ago

Sat, Jul 26 - Wed, Jul 30

STL

St. Louis

DEN

Denver

$193 Roundtrip, found 12 hours ago

$193

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Sat, Jul 26 from St. Louis to Denver, returning Wed, Jul 30, priced at $193 found 12 hours ago

Mon, Jul 21 - Wed, Jul 30

STL

St. Louis

DEN

Denver

$198 Roundtrip, found 12 hours ago

$198

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Denver, returning Wed, Jul 30, priced at $198 found 12 hours ago

Wed, Jul 23 - Fri, Jul 25

STL

St. Louis

DEN

Denver

$208 Roundtrip, found 12 hours ago

$208

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Wed, Jul 23 from St. Louis to Denver, returning Fri, Jul 25, priced at $208 found 12 hours ago

Sat, Jul 26 - Mon, Jul 28

STL

St. Louis

DEN

Denver

$213 Roundtrip, found 12 hours ago

$213

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Sat, Jul 26 from St. Louis to Denver, returning Mon, Jul 28, priced at $213 found 12 hours ago

Mon, Jul 21 - Fri, Jul 25

STL

St. Louis

DEN

Denver

$218 Roundtrip, found 12 hours ago

$218

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Mon, Jul 21 from St. Louis to Denver, returning Fri, Jul 25, priced at $218 found 12 hours ago

Fri, Jul 25 - Sat, Jul 26

STL

St. Louis

DEN

Denver

$233 Roundtrip, found 12 hours ago

$233

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Fri, Jul 25 from St. Louis to Denver, returning Sat, Jul 26, priced at $233 found 12 hours ago