$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 $219 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, May 16 - Sat, May 17

ONT

Ontario

STL

St. Louis

$219 Roundtrip, found 1 day ago

$219

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, May 16 from Ontario to St. Louis, returning Sat, May 17, priced at $219 found 1 day ago

Fri, May 16 - Sun, May 25

ONT

Ontario

STL

St. Louis

$228 Roundtrip, found 1 day ago

$228

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, May 16 from Ontario to St. Louis, returning Sun, May 25, priced at $228 found 1 day ago

Fri, May 16 - Thu, May 22

ONT

Ontario

STL

St. Louis

$239 Roundtrip, found 1 day ago

$239

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, May 16 from Ontario to St. Louis, returning Thu, May 22, priced at $239 found 1 day ago

Sat, May 24 - Sun, May 25

ONT

Ontario

STL

St. Louis

$250 Roundtrip, found 23 hours ago

$250

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Sat, May 24 from Ontario to St. Louis, returning Sun, May 25, priced at $250 found 23 hours ago

Sun, May 25 - Fri, May 30

ONT

Ontario

STL

St. Louis

$260 Roundtrip, found 23 hours ago

$260

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Ontario to St. Louis, returning Fri, May 30, priced at $260 found 23 hours ago

Sun, May 25 - Tue, May 27

ONT

Ontario

STL

St. Louis

$271 Roundtrip, found 23 hours ago

$271

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Ontario to St. Louis, returning Tue, May 27, priced at $271 found 23 hours ago

Thu, Jun 5 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$271 Roundtrip, found 6 days ago

$271

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Jun 5 from Ontario to St. Louis, returning Mon, Jun 9, priced at $271 found 6 days ago

Fri, May 16 - Mon, May 19

ONT

Ontario

STL

St. Louis

$280 Roundtrip, found 1 day ago

$280

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, May 16 from Ontario to St. Louis, returning Mon, May 19, priced at $280 found 1 day ago

Fri, May 23 - Sun, May 25

ONT

Ontario

STL

St. Louis

$281 Roundtrip, found 23 hours ago

$281

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Fri, May 23 from Ontario to St. Louis, returning Sun, May 25, priced at $281 found 23 hours ago

Sun, Jun 8 - Mon, Jun 9

ONT

Ontario

STL

St. Louis

$290 Roundtrip, found 6 days ago

$290

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Sun, Jun 8 from Ontario to St. Louis, returning Mon, Jun 9, priced at $290 found 6 days ago