$91 Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario (ONT)

$91 Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario (ONT)

Prices were available within the past 7 days and start at $91 for one-way flights and $155 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 5 - Fri, Dec 26

PHL

Philadelphia

ONT

Ontario

$155 Roundtrip, found 4 days ago

$155

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Dec 5 from Philadelphia to Ontario, returning Fri, Dec 26, priced at $155 found 4 days ago

Fri, Dec 5 - Mon, Dec 15

PHL

Philadelphia

ONT

Ontario

$156 Roundtrip, found 1 day ago

$156

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 5 from Philadelphia to Ontario, returning Mon, Dec 15, priced at $156 found 1 day ago

Fri, Dec 5 - Tue, Dec 23

PHL

Philadelphia

ONT

Ontario

$165 Roundtrip, found 1 day ago

$165

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 5 from Philadelphia to Ontario, returning Tue, Dec 23, priced at $165 found 1 day ago

Sat, Jan 3 - Mon, Jan 12

PHL

Philadelphia

ONT

Ontario

$174 Roundtrip, found 1 day ago

$174

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jan 3 from Philadelphia to Ontario, returning Mon, Jan 12, priced at $174 found 1 day ago

Mon, Dec 8 - Mon, Dec 15

PHL

Philadelphia

ONT

Ontario

$182 Roundtrip, found 5 hours ago

$182

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Mon, Dec 8 from Philadelphia to Ontario, returning Mon, Dec 15, priced at $182 found 5 hours ago

Mon, Dec 15 - Thu, Dec 25

PHL

Philadelphia

ONT

Ontario

$197 Roundtrip, found 1 day ago

$197

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Dec 15 from Philadelphia to Ontario, returning Thu, Dec 25, priced at $197 found 1 day ago