Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario Intl. Airport (ONT)

Cheap Frontier Airlines flights Philadelphia (PHL) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at for one-way flights and $246 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jul 18 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$246 Roundtrip, found 1 day ago

$246

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 18 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $246 found 1 day ago

Sat, Jul 18 - Thu, Jul 23

PHL

Philadelphia

ONT

Ontario

$250 Roundtrip, found 1 day ago

$250

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 18 from Philadelphia to Ontario, returning Thu, Jul 23, priced at $250 found 1 day ago

Thu, Jul 16 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$276 Roundtrip, found 1 day ago

$276

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 16 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $276 found 1 day ago

Sat, Jul 18 - Sat, Jul 25

PHL

Philadelphia

ONT

Ontario

$280 Roundtrip, found 1 day ago

$280

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 18 from Philadelphia to Ontario, returning Sat, Jul 25, priced at $280 found 1 day ago

Wed, Jul 15 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$293 Roundtrip, found 1 day ago

$293

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $293 found 1 day ago

Wed, Jul 15 - Thu, Jul 23

PHL

Philadelphia

ONT

Ontario

$297 Roundtrip, found 1 day ago

$297

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Philadelphia to Ontario, returning Thu, Jul 23, priced at $297 found 1 day ago

Sun, Jul 19 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$300 Roundtrip, found 1 day ago

$300

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Jul 19 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $300 found 1 day ago

Sat, Jul 18 - Fri, Jul 24

PHL

Philadelphia

ONT

Ontario

$304 Roundtrip, found 1 day ago

$304

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 18 from Philadelphia to Ontario, returning Fri, Jul 24, priced at $304 found 1 day ago

Thu, Jul 16 - Sat, Jul 25

PHL

Philadelphia

ONT

Ontario

$310 Roundtrip, found 1 day ago

$310

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 16 from Philadelphia to Ontario, returning Sat, Jul 25, priced at $310 found 1 day ago

Wed, Jul 15 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$317 Roundtrip, found 1 day ago

$317

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $317 found 1 day ago

Thu, Jul 16 - Tue, Jul 21

PHL

Philadelphia

ONT

Ontario

$319 Roundtrip, found 1 day ago

$319

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 16 from Philadelphia to Ontario, returning Tue, Jul 21, priced at $319 found 1 day ago

Sat, Jul 18 - Wed, Jul 22

PHL

Philadelphia

ONT

Ontario

$321 Roundtrip, found 1 day ago

$321

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Jul 18 from Philadelphia to Ontario, returning Wed, Jul 22, priced at $321 found 1 day ago