$121 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

$121 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

Prices were available within the past 7 days and start at $121 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Sep 27 - Wed, Oct 1

STL

St. Louis

ONT

Ontario

$198 Roundtrip, found 1 day ago

$198

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Wed, Oct 1, priced at $198 found 1 day ago

Sat, Sep 27 - Mon, Oct 6

STL

St. Louis

ONT

Ontario

$210 Roundtrip, found 1 day ago

$210

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Mon, Oct 6, priced at $210 found 1 day ago

Sat, Sep 27 - Wed, Oct 8

STL

St. Louis

ONT

Ontario

$229 Roundtrip, found 1 day ago

$229

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Wed, Oct 8, priced at $229 found 1 day ago

Sat, Sep 27 - Fri, Oct 3

STL

St. Louis

ONT

Ontario

$257 Roundtrip, found 1 day ago

$257

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Fri, Oct 3, priced at $257 found 1 day ago

Sat, Sep 27 - Sun, Oct 5

STL

St. Louis

ONT

Ontario

$458 Roundtrip, found 1 day ago

$458

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Sun, Oct 5, priced at $458 found 1 day ago

Sat, Sep 27 - Fri, Oct 3

STL

St. Louis

ONT

Ontario

$498 Roundtrip, found 1 day ago

$498

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Sep 27 from St. Louis to Ontario, returning Fri, Oct 3, priced at $498 found 1 day ago