Flights from St. Louis to Rancho Santa Margarita

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 13 - Sat, Sep 27

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$219 Roundtrip, found 5 days ago

$219

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, Sep 13 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Sat, Sep 27, priced at $219 found 5 days ago

Sat, Sep 13 - Mon, Sep 22

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$232 Roundtrip, found 5 days ago

$232

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, Sep 13 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Sep 22, priced at $232 found 5 days ago

Sun, Sep 14 - Mon, Sep 22

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$245 Roundtrip, found 5 days ago

$245

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sun, Sep 14 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Sep 22, priced at $245 found 5 days ago

Mon, Jun 16 - Fri, Jun 27

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$247 Roundtrip, found 2 days ago

$247

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Jun 16 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Fri, Jun 27, priced at $247 found 2 days ago

Fri, May 30 - Mon, Jun 9

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$259 Roundtrip, found 3 days ago

$259

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, May 30 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 9, priced at $259 found 3 days ago

Fri, Jun 20 - Fri, Jun 27

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$260 Roundtrip, found 2 days ago

$260

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jun 20 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Fri, Jun 27, priced at $260 found 2 days ago

Wed, Jun 18 - Fri, Jun 27

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$272 Roundtrip, found 2 days ago

$272

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Wed, Jun 18 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Fri, Jun 27, priced at $272 found 2 days ago

Thu, Jun 5 - Mon, Jun 9

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$279 Roundtrip, found 3 days ago

$279

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jun 5 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 9, priced at $279 found 3 days ago

Thu, Jun 5 - Fri, Jun 6

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$292 Roundtrip, found 3 days ago

$292

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jun 5 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Fri, Jun 6, priced at $292 found 3 days ago

Thu, Jun 19 - Mon, Jun 23

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$318 Roundtrip, found 2 days ago

$318

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jun 19 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 23, priced at $318 found 2 days ago

Sun, Jun 1 - Mon, Jun 9

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$335 Roundtrip, found 3 days ago

$335

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jun 1 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 9, priced at $335 found 3 days ago

Tue, Jun 17 - Tue, Jun 24

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$341 Roundtrip, found 2 days ago

$341

Roundtrip

found 2 days ago

Select Delta flight, departing Tue, Jun 17 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $341 found 2 days ago

Wed, Jun 18 - Tue, Jun 24

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$343 Roundtrip, found 2 days ago

$343

Roundtrip

found 2 days ago

Select Delta flight, departing Wed, Jun 18 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $343 found 2 days ago

Sun, Jun 1 - Sat, Jun 7

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$348 Roundtrip, found 3 days ago

$348

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jun 1 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Sat, Jun 7, priced at $348 found 3 days ago

Mon, Jun 16 - Tue, Jun 24

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$351 Roundtrip, found 2 days ago

$351

Roundtrip

found 2 days ago

Select Delta flight, departing Mon, Jun 16 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $351 found 2 days ago

Sat, May 31 - Mon, Jun 9

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$353 Roundtrip, found 3 days ago

$353

Roundtrip

found 3 days ago

Select Delta flight, departing Sat, May 31 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 9, priced at $353 found 3 days ago

Tue, Jun 17 - Mon, Jun 23

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$378 Roundtrip, found 2 days ago

$378

Roundtrip

found 2 days ago

Select Delta flight, departing Tue, Jun 17 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Mon, Jun 23, priced at $378 found 2 days ago

Thu, Jun 19 - Tue, Jun 24

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$380 Roundtrip, found 2 days ago

$380

Roundtrip

found 2 days ago

Select Delta flight, departing Thu, Jun 19 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $380 found 2 days ago

Sun, Jun 15 - Tue, Jun 24

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$381 Roundtrip, found 2 days ago

$381

Roundtrip

found 2 days ago

Select Delta flight, departing Sun, Jun 15 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Tue, Jun 24, priced at $381 found 2 days ago

Tue, Jun 3 - Wed, Jun 4

STL

Lambert-St. Louis Intl.

ONT

Los Angeles - Ontario Intl.

$516 Roundtrip, found 3 days ago

$516

Roundtrip

found 3 days ago

Select Alaska Airlines flight, departing Tue, Jun 3 from Lambert-St. Louis Intl. to Los Angeles - Ontario Intl., returning Wed, Jun 4, priced at $516 found 3 days ago