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 $158 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jan 24 - Wed, Feb 11

STL

St. Louis

ONT

Ontario

$158 Roundtrip, found 2 days ago

$158

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sat, Jan 24 from St. Louis to Ontario, returning Wed, Feb 11, priced at $158 found 2 days ago

Mon, Jan 26 - Wed, Feb 11

STL

St. Louis

ONT

Ontario

$175 Roundtrip, found 2 days ago

$175

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Jan 26 from St. Louis to Ontario, returning Wed, Feb 11, priced at $175 found 2 days ago

Thu, Jan 1 - Wed, Jan 21

STL

St. Louis

ONT

Ontario

$176 Roundtrip, found 2 days ago

$176

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jan 1 from St. Louis to Ontario, returning Wed, Jan 21, priced at $176 found 2 days ago

Thu, Jan 1 - Wed, Jan 14

STL

St. Louis

ONT

Ontario

$193 Roundtrip, found 2 days ago

$193

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jan 1 from St. Louis to Ontario, returning Wed, Jan 14, priced at $193 found 2 days ago

Mon, Jan 19 - Sat, Jan 31

STL

St. Louis

ONT

Ontario

$194 Roundtrip, found 2 days ago

$194

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Jan 19 from St. Louis to Ontario, returning Sat, Jan 31, priced at $194 found 2 days ago

Wed, Feb 18 - Sat, Feb 28

STL

St. Louis

ONT

Ontario

$196 Roundtrip, found 2 days ago

$196

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Wed, Feb 18 from St. Louis to Ontario, returning Sat, Feb 28, priced at $196 found 2 days ago

Fri, Jan 23 - Wed, Feb 11

STL

St. Louis

ONT

Ontario

$210 Roundtrip, found 2 days ago

$210

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jan 23 from St. Louis to Ontario, returning Wed, Feb 11, priced at $210 found 2 days ago

Mon, Jan 19 - Wed, Feb 4

STL

St. Louis

ONT

Ontario

$211 Roundtrip, found 2 days ago

$211

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Jan 19 from St. Louis to Ontario, returning Wed, Feb 4, priced at $211 found 2 days ago

Thu, Jan 1 - Sat, Jan 17

STL

St. Louis

ONT

Ontario

$212 Roundtrip, found 2 days ago

$212

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jan 1 from St. Louis to Ontario, returning Sat, Jan 17, priced at $212 found 2 days ago

Wed, Feb 18 - Wed, Mar 4

STL

St. Louis

ONT

Ontario

$213 Roundtrip, found 6 days ago

$213

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Wed, Feb 18 from St. Louis to Ontario, returning Wed, Mar 4, priced at $213 found 6 days ago

Thu, Jan 1 - Thu, Jan 22

STL

St. Louis

ONT

Ontario

$214 Roundtrip, found 2 days ago

$214

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Jan 1 from St. Louis to Ontario, returning Thu, Jan 22, priced at $214 found 2 days ago

Sat, Dec 20 - Wed, Dec 24

STL

St. Louis

ONT

Ontario

$217 Roundtrip, found 6 days ago

$217

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Sat, Dec 20 from St. Louis to Ontario, returning Wed, Dec 24, priced at $217 found 6 days ago