$65 Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario (ONT)

$65 Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario (ONT)

Prices were available within the past 7 days and start at $65 for one-way flights and $137 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Dec 15 - Sun, Dec 21

PHL

Philadelphia

ONT

Ontario

$137 Roundtrip, found 7 hours ago

$137

Roundtrip

found 7 hours ago

Select Frontier Airlines flight, departing Mon, Dec 15 from Philadelphia to Ontario, returning Sun, Dec 21, priced at $137 found 7 hours ago

Fri, Dec 12 - Sun, Dec 21

PHL

Philadelphia

ONT

Ontario

$138 Roundtrip, found 2 hours ago

$138

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Fri, Dec 12 from Philadelphia to Ontario, returning Sun, Dec 21, priced at $138 found 2 hours ago

Mon, Dec 8 - Mon, Dec 15

PHL

Philadelphia

ONT

Ontario

$140 Roundtrip, found 1 hour ago

$140

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Mon, Dec 8 from Philadelphia to Ontario, returning Mon, Dec 15, priced at $140 found 1 hour ago

Fri, Dec 12 - Sun, Dec 21

PHL

Philadelphia

ONT

Ontario

$141 Roundtrip, found 2 hours ago

$141

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Fri, Dec 12 from Philadelphia to Ontario, returning Sun, Dec 21, priced at $141 found 2 hours ago

Sun, Dec 7 - Mon, Jan 12

PHL

Philadelphia

ONT

Ontario

$144 Roundtrip, found 3 hours ago

$144

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Sun, Dec 7 from Philadelphia to Ontario, returning Mon, Jan 12, priced at $144 found 3 hours ago

Tue, Nov 25 - Mon, Dec 15

PHL

Philadelphia

ONT

Ontario

$147 Roundtrip, found 4 days ago

$147

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Tue, Nov 25 from Philadelphia to Ontario, returning Mon, Dec 15, priced at $147 found 4 days ago