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Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Wed, Dec 9 - Wed, Dec 16

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$53 Roundtrip, found 1 hour ago

$53

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Wed, Dec 9 from San Francisco Intl. to Ontario Intl. Airport, returning Wed, Dec 16, priced at $53 found 1 hour ago

Tue, Dec 8 - Wed, Dec 9

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$58 Roundtrip, found 9 hours ago

$58

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Tue, Dec 8 from Denver Intl. to Ontario Intl. Airport, returning Wed, Dec 9, priced at $58 found 9 hours ago

Tue, Jan 12 - Wed, Jan 20

PHX

Sky Harbor Intl.

ONT

Ontario Intl. Airport

$124 Roundtrip, just found

$124

Roundtrip

just found

Select Frontier Airlines flight, departing Tue, Jan 12 from Sky Harbor Intl. to Ontario Intl. Airport, returning Wed, Jan 20, priced at $124 just found

Fri, Jan 1 - Thu, Jan 14

OAK

Oakland Intl.

ONT

Ontario Intl. Airport

$150 Roundtrip, found 1 hour ago

$150

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Fri, Jan 1 from Oakland Intl. to Ontario Intl. Airport, returning Thu, Jan 14, priced at $150 found 1 hour ago