Flights from St. Louis to Prospect 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.

Tue, Sep 30 - Tue, Oct 7

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$137 Roundtrip, found 3 days ago

$137

Roundtrip

found 3 days ago

Select United flight, departing Tue, Sep 30 from Lambert-St. Louis Intl. to O'Hare Intl., returning Tue, Oct 7, priced at $137 found 3 days ago

Thu, Oct 2 - Tue, Oct 7

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$151 Roundtrip, found 3 days ago

$151

Roundtrip

found 3 days ago

Select American Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to O'Hare Intl., returning Tue, Oct 7, priced at $151 found 3 days ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$160 Roundtrip, found 12 hours ago

$160

Roundtrip

found 12 hours ago

Select United flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $160 found 12 hours ago

Thu, Oct 2 - Thu, Oct 9

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$167 Roundtrip, found 3 days ago

$167

Roundtrip

found 3 days ago

Select United flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to O'Hare Intl., returning Thu, Oct 9, priced at $167 found 3 days ago

Tue, Sep 30 - Fri, Oct 10

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$168 Roundtrip, found 3 days ago

$168

Roundtrip

found 3 days ago

Select American Airlines flight, departing Tue, Sep 30 from Lambert-St. Louis Intl. to O'Hare Intl., returning Fri, Oct 10, priced at $168 found 3 days ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$170 Roundtrip, found 12 hours ago

$170

Roundtrip

found 12 hours ago

Select Delta flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $170 found 12 hours ago

Tue, Sep 30 - Sat, Oct 11

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$174 Roundtrip, found 3 days ago

$174

Roundtrip

found 3 days ago

Select United flight, departing Tue, Sep 30 from Lambert-St. Louis Intl. to O'Hare Intl., returning Sat, Oct 11, priced at $174 found 3 days ago

Sat, Oct 4 - Sat, Oct 11

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$177 Roundtrip, found 3 days ago

$177

Roundtrip

found 3 days ago

Select Delta flight, departing Sat, Oct 4 from Lambert-St. Louis Intl. to O'Hare Intl., returning Sat, Oct 11, priced at $177 found 3 days ago

Thu, Oct 2 - Sat, Oct 11

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$181 Roundtrip, found 3 days ago

$181

Roundtrip

found 3 days ago

Select American Airlines flight, departing Thu, Oct 2 from Lambert-St. Louis Intl. to O'Hare Intl., returning Sat, Oct 11, priced at $181 found 3 days ago

Mon, Jul 21 - Sun, Jul 27

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$185 Roundtrip, found 12 hours ago

$185

Roundtrip

found 12 hours ago

Select Southern Airways Express flight, departing Mon, Jul 21 from Lambert-St. Louis Intl. to O'Hare Intl., returning Sun, Jul 27, priced at $185 found 12 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$190 Roundtrip, found 12 hours ago

$190

Roundtrip

found 12 hours ago

Select American Airlines flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $190 found 12 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$192 Roundtrip, found 12 hours ago

$192

Roundtrip

found 12 hours ago

Select United flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $192 found 12 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$194 Roundtrip, found 12 hours ago

$194

Roundtrip

found 12 hours ago

Select American Airlines flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $194 found 12 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$195 Roundtrip, found 12 hours ago

$195

Roundtrip

found 12 hours ago

Select Delta flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $195 found 12 hours ago

Fri, Oct 3 - Sat, Oct 11

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$198 Roundtrip, found 3 days ago

$198

Roundtrip

found 3 days ago

Select Southern Airways Express flight, departing Fri, Oct 3 from Lambert-St. Louis Intl. to O'Hare Intl., returning Sat, Oct 11, priced at $198 found 3 days ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$200 Roundtrip, found 12 hours ago

$200

Roundtrip

found 12 hours ago

Select Delta flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $200 found 12 hours ago

Wed, Jul 23 - Wed, Jul 30

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$203 Roundtrip, found 12 hours ago

$203

Roundtrip

found 12 hours ago

Select United flight, departing Wed, Jul 23 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 30, priced at $203 found 12 hours ago

Tue, Jul 8 - Wed, Jul 16

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$266 Roundtrip, found 12 hours ago

$266

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Tue, Jul 8 from Lambert-St. Louis Intl. to O'Hare Intl., returning Wed, Jul 16, priced at $266 found 12 hours ago

Wed, Jul 9 - Mon, Jul 21

STL

Lambert-St. Louis Intl.

ORD

O'Hare Intl.

$302 Roundtrip, found 12 hours ago

$302

Roundtrip

found 12 hours ago

Select Spirit Airlines flight, departing Wed, Jul 9 from Lambert-St. Louis Intl. to O'Hare Intl., returning Mon, Jul 21, priced at $302 found 12 hours ago

Thu, Jun 26 - Sun, Jun 29

STL

Lambert-St. Louis Intl.

MDW

Midway Intl.

$340 Roundtrip, found 6 days ago

$340

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Jun 26 from Lambert-St. Louis Intl. to Midway Intl., returning Sun, Jun 29, priced at $340 found 6 days ago