Cheap Frontier Airlines flights Chicago (ORD) to Ontario (ONT)

Cheap Frontier Airlines flights Chicago (ORD) to Ontario (ONT)

Prices were available within the past 7 days and start at for one-way flights and $220 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Feb 1 - Thu, Feb 5

ORD

Chicago

ONT

Ontario

$220 Roundtrip, found 4 days ago

$220

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sun, Feb 1 from Chicago to Ontario, returning Thu, Feb 5, priced at $220 found 4 days ago

Tue, Mar 24 - Thu, Apr 9

ORD

Chicago

ONT

Ontario

$227 Roundtrip, found 1 day ago

$227

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Mar 24 from Chicago to Ontario, returning Thu, Apr 9, priced at $227 found 1 day ago

Thu, Jan 29 - Thu, Feb 5

ORD

Chicago

ONT

Ontario

$230 Roundtrip, found 4 days ago

$230

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Thu, Jan 29 from Chicago to Ontario, returning Thu, Feb 5, priced at $230 found 4 days ago

Mon, Mar 23 - Thu, Apr 9

ORD

Chicago

ONT

Ontario

$261 Roundtrip, found 1 day ago

$261

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Mar 23 from Chicago to Ontario, returning Thu, Apr 9, priced at $261 found 1 day ago

Tue, Mar 24 - Fri, Apr 10

ORD

Chicago

ONT

Ontario

$262 Roundtrip, found 1 day ago

$262

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Mar 24 from Chicago to Ontario, returning Fri, Apr 10, priced at $262 found 1 day ago

Sun, Feb 1 - Mon, Feb 16

ORD

Chicago

ONT

Ontario

$270 Roundtrip, found 5 days ago

$270

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sun, Feb 1 from Chicago to Ontario, returning Mon, Feb 16, priced at $270 found 5 days ago

Tue, Mar 24 - Sat, Apr 11

ORD

Chicago

ONT

Ontario

$278 Roundtrip, found 1 day ago

$278

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Mar 24 from Chicago to Ontario, returning Sat, Apr 11, priced at $278 found 1 day ago

Thu, Jan 29 - Mon, Feb 16

ORD

Chicago

ONT

Ontario

$280 Roundtrip, found 5 days ago

$280

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Jan 29 from Chicago to Ontario, returning Mon, Feb 16, priced at $280 found 5 days ago

Tue, Mar 24 - Sun, Apr 12

ORD

Chicago

ONT

Ontario

$282 Roundtrip, found 1 day ago

$282

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Mar 24 from Chicago to Ontario, returning Sun, Apr 12, priced at $282 found 1 day ago

Fri, Mar 20 - Thu, Apr 9

ORD

Chicago

ONT

Ontario

$292 Roundtrip, found 1 day ago

$292

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Mar 20 from Chicago to Ontario, returning Thu, Apr 9, priced at $292 found 1 day ago

Mon, Mar 23 - Fri, Apr 10

ORD

Chicago

ONT

Ontario

$296 Roundtrip, found 1 day ago

$296

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Mar 23 from Chicago to Ontario, returning Fri, Apr 10, priced at $296 found 1 day ago

Wed, Mar 18 - Fri, Apr 10

ORD

Chicago

ONT

Ontario

$297 Roundtrip, found 1 day ago

$297

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Mar 18 from Chicago to Ontario, returning Fri, Apr 10, priced at $297 found 1 day ago