$34 Cheap Frontier Airlines flights Denver (DEN) to Ontario (ONT)

$34 Cheap Frontier Airlines flights Denver (DEN) to Ontario (ONT)

Prices were available within the past 7 days and start at $34 for one-way flights and $68 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Feb 3 - Tue, Feb 10

DEN

Denver

ONT

Ontario

$68 Roundtrip, found 4 hours ago

$68

Roundtrip

found 4 hours ago

Select Frontier Airlines flight, departing Tue, Feb 3 from Denver to Ontario, returning Tue, Feb 10, priced at $68 found 4 hours ago

Wed, Jan 7 - Thu, Jan 22

DEN

Denver

ONT

Ontario

$79 Roundtrip, found 1 day ago

$79

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jan 7 from Denver to Ontario, returning Thu, Jan 22, priced at $79 found 1 day ago

Wed, Jan 7 - Fri, Jan 23

DEN

Denver

ONT

Ontario

$83 Roundtrip, found 1 day ago

$83

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jan 7 from Denver to Ontario, returning Fri, Jan 23, priced at $83 found 1 day ago

Thu, Jan 8 - Thu, Jan 22

DEN

Denver

ONT

Ontario

$90 Roundtrip, found 1 day ago

$90

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jan 8 from Denver to Ontario, returning Thu, Jan 22, priced at $90 found 1 day ago

Fri, Jan 9 - Wed, Jan 21

DEN

Denver

ONT

Ontario

$93 Roundtrip, found 2 days ago

$93

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jan 9 from Denver to Ontario, returning Wed, Jan 21, priced at $93 found 2 days ago

Thu, Jan 8 - Fri, Jan 23

DEN

Denver

ONT

Ontario

$94 Roundtrip, found 1 day ago

$94

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jan 8 from Denver to Ontario, returning Fri, Jan 23, priced at $94 found 1 day ago

Fri, Jan 23 - Sun, Feb 8

DEN

Denver

ONT

Ontario

$98 Roundtrip, found 2 days ago

$98

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jan 23 from Denver to Ontario, returning Sun, Feb 8, priced at $98 found 2 days ago

Sun, Jan 11 - Tue, Jan 27

DEN

Denver

ONT

Ontario

$103 Roundtrip, found 1 day ago

$103

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Jan 11 from Denver to Ontario, returning Tue, Jan 27, priced at $103 found 1 day ago