Flights from O'Fallon

Cheapest flights from O'Fallon

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.

Tue, Jun 30 - Tue, Jul 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$100 Roundtrip, found 1 day ago

$100

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Jun 30 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Jul 7, priced at $100 found 1 day ago

Tue, Aug 25 - Wed, Aug 26

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$133 Roundtrip, found 1 hour ago

$133

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Tue, Aug 25 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Aug 26, priced at $133 found 1 hour ago

Tue, Jun 30 - Wed, Jul 8

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$153 Roundtrip, found 1 day ago

$153

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Jun 30 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Jul 8, priced at $153 found 1 day ago

Wed, Jul 1 - Tue, Jul 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$155 Roundtrip, found 1 day ago

$155

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 1 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Jul 7, priced at $155 found 1 day ago

Tue, Jul 21 - Wed, Jul 22

STL

Lambert-St. Louis Intl.

LAS

Harry Reid Intl.

$156 Roundtrip, found 8 hours ago

$156

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Tue, Jul 21 from Lambert-St. Louis Intl. to Harry Reid Intl., returning Wed, Jul 22, priced at $156 found 8 hours ago

Sat, Jul 4 - Tue, Jul 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$160 Roundtrip, found 1 day ago

$160

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 4 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Jul 7, priced at $160 found 1 day ago

Mon, Jun 29 - Tue, Jul 7

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$165 Roundtrip, found 1 day ago

$165

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jun 29 from Lambert-St. Louis Intl. to Denver Intl., returning Tue, Jul 7, priced at $165 found 1 day ago

Tue, Sep 29 - Wed, Sep 30

STL

Lambert-St. Louis Intl.

MIA

Miami Intl.

$197 Roundtrip, found 5 days ago

$197

Roundtrip

found 5 days ago

Select Delta flight, departing Tue, Sep 29 from Lambert-St. Louis Intl. to Miami Intl., returning Wed, Sep 30, priced at $197 found 5 days ago

Mon, Sep 28 - Thu, Oct 1

STL

Lambert-St. Louis Intl.

MCO

Orlando Intl.

$204 Roundtrip, found 1 day ago

$204

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Sep 28 from Lambert-St. Louis Intl. to Orlando Intl., returning Thu, Oct 1, priced at $204 found 1 day ago

Tue, Aug 25 - Wed, Aug 26

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$217 Roundtrip, found 1 hour ago

$217

Roundtrip

found 1 hour ago

Select Southwest Airlines flight, departing Tue, Aug 25 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Aug 26, priced at $217 found 1 hour ago

Tue, Aug 25 - Wed, Aug 26

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$217 Roundtrip, found 1 hour ago

$217

Roundtrip

found 1 hour ago

Select United flight, departing Tue, Aug 25 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Aug 26, priced at $217 found 1 hour ago

Tue, Nov 17 - Wed, Dec 2

STL

Lambert-St. Louis Intl.

TPA

Tampa Intl.

$225 Roundtrip, found 23 hours ago

$225

Roundtrip

found 23 hours ago

Select Delta flight, departing Tue, Nov 17 from Lambert-St. Louis Intl. to Tampa Intl., returning Wed, Dec 2, priced at $225 found 23 hours ago

Tue, Aug 25 - Wed, Aug 26

STL

Lambert-St. Louis Intl.

DEN

Denver Intl.

$237 Roundtrip, found 1 hour ago

$237

Roundtrip

found 1 hour ago

Select American Airlines flight, departing Tue, Aug 25 from Lambert-St. Louis Intl. to Denver Intl., returning Wed, Aug 26, priced at $237 found 1 hour ago

Tue, Nov 10 - Tue, Nov 17

STL

Lambert-St. Louis Intl.

PHX

Sky Harbor Intl.

$248 Roundtrip, found 5 days ago

$248

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Tue, Nov 10 from Lambert-St. Louis Intl. to Sky Harbor Intl., returning Tue, Nov 17, priced at $248 found 5 days ago

Sat, Oct 17 - Wed, Oct 21

STL

Lambert-St. Louis Intl.

SAN

San Diego Intl.

$278 Roundtrip, found 2 days ago

$278

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Oct 17 from Lambert-St. Louis Intl. to San Diego Intl., returning Wed, Oct 21, priced at $278 found 2 days ago

Sat, Jul 11 - Tue, Jul 14

STL

Lambert-St. Louis Intl.

LAX

Los Angeles Intl.

$299 Roundtrip, found 2 days ago

$299

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Jul 11 from Lambert-St. Louis Intl. to Los Angeles Intl., returning Tue, Jul 14, priced at $299 found 2 days ago

Sat, Oct 17 - Wed, Oct 21

STL

Lambert-St. Louis Intl.

SAN

San Diego Intl.

$317 Roundtrip, found 2 days ago

$317

Roundtrip

found 2 days ago

Select Alaska Airlines flight, departing Sat, Oct 17 from Lambert-St. Louis Intl. to San Diego Intl., returning Wed, Oct 21, priced at $317 found 2 days ago

Fri, Jun 26 - Sat, Jul 11

STL

Lambert-St. Louis Intl.

DAL

Love Field

$320 Roundtrip, found 6 days ago

$320

Roundtrip

found 6 days ago

Select Southwest Airlines flight, departing Fri, Jun 26 from Lambert-St. Louis Intl. to Love Field, returning Sat, Jul 11, priced at $320 found 6 days ago

Sat, Sep 12 - Sat, Sep 19

STL

Lambert-St. Louis Intl.

RSW

Southwest Florida Intl.

$331 Roundtrip, found 6 days ago

$331

Roundtrip

found 6 days ago

Select Delta flight, departing Sat, Sep 12 from Lambert-St. Louis Intl. to Southwest Florida Intl., returning Sat, Sep 19, priced at $331 found 6 days ago

Wed, Jul 15 - Tue, Aug 4

STL

Lambert-St. Louis Intl.

CLD

McClellan-Palomar

$349 Roundtrip, found 6 days ago

$349

Roundtrip

found 6 days ago

Select American Airlines flight, departing Wed, Jul 15 from Lambert-St. Louis Intl. to McClellan-Palomar, returning Tue, Aug 4, priced at $349 found 6 days ago