$196 Cheap Frontier Airlines flights Ontario (ONT) to St. Louis (STL)

$196 Cheap Frontier Airlines flights Ontario (ONT) to St. Louis (STL)

Prices were available within the past 7 days and start at $196 for one-way flights and $239 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 9 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$239 Roundtrip, found 3 days ago

$239

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Jun 9 from Ontario to St. Louis, returning Mon, Jun 9, priced at $239 found 3 days ago

Thu, Jun 5 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$271 Roundtrip, found 3 days ago

$271

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jun 5 from Ontario to St. Louis, returning Mon, Jun 9, priced at $271 found 3 days ago

Sat, Jun 7 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$280 Roundtrip, found 3 days ago

$280

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 7 from Ontario to St. Louis, returning Mon, Jun 9, priced at $280 found 3 days ago

Sun, Jun 8 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$290 Roundtrip, found 3 days ago

$290

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jun 8 from Ontario to St. Louis, returning Mon, Jun 9, priced at $290 found 3 days ago

Thu, Jun 5 - Sun, Jun 8

ONT

Ontario

STL

St. Louis

$310 Roundtrip, found 3 days ago

$310

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jun 5 from Ontario to St. Louis, returning Sun, Jun 8, priced at $310 found 3 days ago

Sat, Jun 7 - Sun, Jun 8

ONT

Ontario

STL

St. Louis

$321 Roundtrip, found 3 days ago

$321

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 7 from Ontario to St. Louis, returning Sun, Jun 8, priced at $321 found 3 days ago

Mon, Jun 9 - Fri, Jun 13

ONT

Ontario

STL

St. Louis

$341 Roundtrip, found 3 days ago

$341

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Jun 9 from Ontario to St. Louis, returning Fri, Jun 13, priced at $341 found 3 days ago

Thu, Jul 10 - Mon, Jul 14

ONT

Ontario

STL

St. Louis

$405 Roundtrip, found 1 day ago

$405

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 10 from Ontario to St. Louis, returning Mon, Jul 14, priced at $405 found 1 day ago

Thu, Jul 10 - Mon, Jul 14

ONT

Ontario

STL

St. Louis

$424 Roundtrip, found 1 day ago

$424

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 10 from Ontario to St. Louis, returning Mon, Jul 14, priced at $424 found 1 day ago

Fri, Jul 11 - Fri, Jul 11

ONT

Ontario

STL

St. Louis

$442 Roundtrip, found 1 day ago

$442

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 11 from Ontario to St. Louis, returning Fri, Jul 11, priced at $442 found 1 day ago