$108 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

$108 Cheap Frontier Airlines flights St. Louis (STL) to Ontario (ONT)

Prices were available within the past 7 days and start at $108 for one-way flights and $220 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

$220 Roundtrip, found 1 day ago

$220

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $220 found 1 day ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$225 Roundtrip, found 1 day ago

$225

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $225 found 1 day ago

Sat, Nov 1 - Sat, Nov 8

STL

St. Louis

ONT

Ontario

$228 Roundtrip, found 4 days ago

$228

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sat, Nov 1 from St. Louis to Ontario, returning Sat, Nov 8, priced at $228 found 4 days ago

Sat, Nov 1 - Mon, Nov 3

STL

St. Louis

ONT

Ontario

$238 Roundtrip, found 4 days ago

$238

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sat, Nov 1 from St. Louis to Ontario, returning Mon, Nov 3, priced at $238 found 4 days ago

Fri, Oct 31 - Mon, Nov 3

STL

St. Louis

ONT

Ontario

$248 Roundtrip, found 4 days ago

$248

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Oct 31 from St. Louis to Ontario, returning Mon, Nov 3, priced at $248 found 4 days ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$253 Roundtrip, found 1 day ago

$253

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $253 found 1 day ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$258 Roundtrip, found 1 day ago

$258

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $258 found 1 day ago

Mon, Nov 3 - Thu, Nov 6

STL

St. Louis

ONT

Ontario

$310 Roundtrip, found 1 day ago

$310

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Nov 3 from St. Louis to Ontario, returning Thu, Nov 6, priced at $310 found 1 day ago