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

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

Prices were available within the past 7 days and start at for one-way flights and $210 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jun 27 - Sat, Jul 5

STL

St. Louis

ONT

Ontario

$210 Roundtrip, found 6 days ago

$210

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from St. Louis to Ontario, returning Sat, Jul 5, priced at $210 found 6 days ago

Mon, Jun 30 - Wed, Jul 30

STL

St. Louis

ONT

Ontario

$280 Roundtrip, found 6 days ago

$280

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Mon, Jun 30 from St. Louis to Ontario, returning Wed, Jul 30, priced at $280 found 6 days ago

Mon, Jun 30 - Fri, Aug 1

STL

St. Louis

ONT

Ontario

$285 Roundtrip, found 6 days ago

$285

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Mon, Jun 30 from St. Louis to Ontario, returning Fri, Aug 1, priced at $285 found 6 days ago

Fri, Jun 27 - Fri, Jul 4

STL

St. Louis

ONT

Ontario

$288 Roundtrip, found 6 days ago

$288

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from St. Louis to Ontario, returning Fri, Jul 4, priced at $288 found 6 days ago

Mon, Jun 30 - Sun, Aug 3

STL

St. Louis

ONT

Ontario

$305 Roundtrip, found 6 days ago

$305

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Mon, Jun 30 from St. Louis to Ontario, returning Sun, Aug 3, priced at $305 found 6 days ago

Wed, Jul 23 - Wed, Jul 30

STL

St. Louis

ONT

Ontario

$306 Roundtrip, found 1 day ago

$306

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 23 from St. Louis to Ontario, returning Wed, Jul 30, priced at $306 found 1 day ago

Fri, Jun 27 - Mon, Jul 7

STL

St. Louis

ONT

Ontario

$308 Roundtrip, found 6 days ago

$308

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from St. Louis to Ontario, returning Mon, Jul 7, priced at $308 found 6 days ago

Wed, Jul 23 - Thu, Jul 31

STL

St. Louis

ONT

Ontario

$311 Roundtrip, found 1 day ago

$311

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 23 from St. Louis to Ontario, returning Thu, Jul 31, priced at $311 found 1 day ago

Wed, Jul 23 - Sun, Aug 3

STL

St. Louis

ONT

Ontario

$316 Roundtrip, found 1 day ago

$316

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 23 from St. Louis to Ontario, returning Sun, Aug 3, priced at $316 found 1 day ago

Mon, Jun 30 - Sat, Aug 2

STL

St. Louis

ONT

Ontario

$320 Roundtrip, found 6 days ago

$320

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Mon, Jun 30 from St. Louis to Ontario, returning Sat, Aug 2, priced at $320 found 6 days ago

Fri, Jul 25 - Thu, Jul 31

STL

St. Louis

ONT

Ontario

$321 Roundtrip, found 1 day ago

$321

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 25 from St. Louis to Ontario, returning Thu, Jul 31, priced at $321 found 1 day ago

Fri, Jun 27 - Sun, Jul 27

STL

St. Louis

ONT

Ontario

$325 Roundtrip, found 6 days ago

$325

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Fri, Jun 27 from St. Louis to Ontario, returning Sun, Jul 27, priced at $325 found 6 days ago