Flights from St. Louis to Federal Heights

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.

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$111 Roundtrip, found 4 days ago

$111

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 $111 found 4 days ago

Tue, Sep 23 - Sat, Sep 27

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$122 Roundtrip, found 6 days ago

$122

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Sep 27, priced at $122 found 6 days ago

Tue, Sep 23 - Sun, Sep 28

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$135 Roundtrip, found 6 days ago

$135

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Tue, Sep 23 from Lambert-St. Louis Intl. to Denver Intl., returning Sun, Sep 28, priced at $135 found 6 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$140 Roundtrip, found 4 days ago

$140

Roundtrip

found 4 days ago

Select United flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $140 found 4 days ago

Thu, Sep 25 - Sun, Sep 28

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$148 Roundtrip, found 6 days ago

$148

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Denver Intl., returning Sun, Sep 28, priced at $148 found 6 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$155 Roundtrip, found 4 days ago

$155

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $155 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$157 Roundtrip, found 4 days ago

$157

Roundtrip

found 4 days ago

Select United flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $157 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$160 Roundtrip, found 4 days ago

$160

Roundtrip

found 4 days ago

Select Delta flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $160 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$160 Roundtrip, found 23 hours ago

$160

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $160 found 23 hours ago

Fri, Sep 26 - Tue, Sep 30

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$170 Roundtrip, found 6 days ago

$170

Roundtrip

found 6 days ago

Select American Airlines flight, departing Fri, Sep 26 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Sep 30, priced at $170 found 6 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$175 Roundtrip, found 4 days ago

$175

Roundtrip

found 4 days ago

Select United flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $175 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$177 Roundtrip, found 4 days ago

$177

Roundtrip

found 4 days ago

Select United flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $177 found 4 days ago

Sun, Sep 28 - Tue, Oct 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$179 Roundtrip, found 23 hours ago

$179

Roundtrip

found 23 hours ago

Select United flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Oct 7, priced at $179 found 23 hours ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$180 Roundtrip, found 4 days ago

$180

Roundtrip

found 4 days ago

Select United flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $180 found 4 days ago

Thu, Sep 25 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$180 Roundtrip, found 23 hours ago

$180

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Thu, Sep 25 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $180 found 23 hours ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$187 Roundtrip, found 4 days ago

$187

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $187 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$187 Roundtrip, found 4 days ago

$187

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $187 found 4 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$190 Roundtrip, found 4 days ago

$190

Roundtrip

found 4 days ago

Select American Airlines flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $190 found 4 days ago

Sun, Sep 28 - Tue, Sep 30

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$193 Roundtrip, found 6 days ago

$193

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Sun, Sep 28 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Sep 30, priced at $193 found 6 days ago

Sat, Sep 27 - Sat, Oct 4

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$195 Roundtrip, found 4 days ago

$195

Roundtrip

found 4 days ago

Select Delta flight, departing Sat, Sep 27 from Lambert-St. Louis Intl. to Denver Intl., returning Sat, Oct 4, priced at $195 found 4 days ago