$114 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

$114 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

Prices were available within the past 7 days and start at $114 for one-way flights and $222 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$222 Roundtrip, found 1 day ago

$222

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $222 found 1 day ago

Sat, Nov 1 - Sat, Nov 8

STL

St. Louis

ONT

Ontario

$228 Roundtrip, found 2 days ago

$228

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Nov 1 from St. Louis to Ontario, returning Sat, Nov 8, priced at $228 found 2 days ago

Sat, Nov 1 - Mon, Nov 3

STL

St. Louis

ONT

Ontario

$238 Roundtrip, found 2 days ago

$238

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Nov 1 from St. Louis to Ontario, returning Mon, Nov 3, priced at $238 found 2 days ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$243 Roundtrip, found 1 day ago

$243

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $243 found 1 day ago

Fri, Oct 31 - Mon, Nov 3

STL

St. Louis

ONT

Ontario

$248 Roundtrip, found 2 days ago

$248

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Oct 31 from St. Louis to Ontario, returning Mon, Nov 3, priced at $248 found 2 days ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$261 Roundtrip, found 1 day ago

$261

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $261 found 1 day ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$321 Roundtrip, found 1 day ago

$321

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $321 found 1 day ago