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 $144 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Feb 8 - Thu, Feb 12

ORD

Chicago

ONT

Ontario

$144 Roundtrip, found 13 hours ago

$144

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Sun, Feb 8 from Chicago to Ontario, returning Thu, Feb 12, priced at $144 found 13 hours ago

Sun, Feb 8 - Fri, Feb 20

ORD

Chicago

ONT

Ontario

$148 Roundtrip, found 13 hours ago

$148

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Sun, Feb 8 from Chicago to Ontario, returning Fri, Feb 20, priced at $148 found 13 hours ago

Thu, Feb 5 - Fri, Feb 20

ORD

Chicago

ONT

Ontario

$152 Roundtrip, found 13 hours ago

$152

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Thu, Feb 5 from Chicago to Ontario, returning Fri, Feb 20, priced at $152 found 13 hours ago

Thu, Feb 19 - Mon, Mar 2

ORD

Chicago

ONT

Ontario

$216 Roundtrip, found 13 hours ago

$216

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Thu, Feb 19 from Chicago to Ontario, returning Mon, Mar 2, priced at $216 found 13 hours ago

Thu, Feb 12 - Fri, Feb 20

ORD

Chicago

ONT

Ontario

$220 Roundtrip, found 13 hours ago

$220

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Chicago to Ontario, returning Fri, Feb 20, priced at $220 found 13 hours ago

Sun, Feb 1 - Mon, Feb 2

ORD

Chicago

ONT

Ontario

$221 Roundtrip, found 17 hours ago

$221

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sun, Feb 1 from Chicago to Ontario, returning Mon, Feb 2, priced at $221 found 17 hours ago

Sun, Feb 1 - Fri, Feb 20

ORD

Chicago

ONT

Ontario

$225 Roundtrip, found 13 hours ago

$225

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Sun, Feb 1 from Chicago to Ontario, returning Fri, Feb 20, priced at $225 found 13 hours ago

Thu, Feb 12 - Mon, Mar 2

ORD

Chicago

ONT

Ontario

$292 Roundtrip, found 13 hours ago

$292

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Chicago to Ontario, returning Mon, Mar 2, priced at $292 found 13 hours ago