$152 Cheap Frontier Airlines flights Ontario (ONT) to St. Louis (STL)

$152 Cheap Frontier Airlines flights Ontario (ONT) to St. Louis (STL)

Prices were available within the past 7 days and start at $152 for one-way flights and $245 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 21 - Sat, Oct 25

ONT

Ontario

STL

St. Louis

$245 Roundtrip, found 1 day ago

$245

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Oct 21 from Ontario to St. Louis, returning Sat, Oct 25, priced at $245 found 1 day ago

Fri, Sep 12 - Mon, Sep 15

ONT

Ontario

STL

St. Louis

$270 Roundtrip, found 23 hours ago

$270

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Fri, Sep 12 from Ontario to St. Louis, returning Mon, Sep 15, priced at $270 found 23 hours ago

Fri, Sep 12 - Mon, Sep 15

ONT

Ontario

STL

St. Louis

$281 Roundtrip, found 23 hours ago

$281

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Fri, Sep 12 from Ontario to St. Louis, returning Mon, Sep 15, priced at $281 found 23 hours ago

Sun, Oct 19 - Sat, Oct 25

ONT

Ontario

STL

St. Louis

$286 Roundtrip, found 1 day ago

$286

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Oct 19 from Ontario to St. Louis, returning Sat, Oct 25, priced at $286 found 1 day ago

Sun, Oct 19 - Tue, Oct 28

ONT

Ontario

STL

St. Louis

$288 Roundtrip, found 1 day ago

$288

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Oct 19 from Ontario to St. Louis, returning Tue, Oct 28, priced at $288 found 1 day ago

Tue, Oct 21 - Sat, Oct 25

ONT

Ontario

STL

St. Louis

$291 Roundtrip, found 1 day ago

$291

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Oct 21 from Ontario to St. Louis, returning Sat, Oct 25, priced at $291 found 1 day ago