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

Tue, Dec 1 - Wed, Dec 16

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$38 Roundtrip, found 1 day ago

$38

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 1 from San Francisco Intl. to Ontario Intl. Airport, returning Wed, Dec 16, priced at $38 found 1 day ago

Sat, Nov 21 - Fri, Dec 4

OAK

Oakland Intl.

ONT

Ontario Intl. Airport

$106 Roundtrip, found 15 hours ago

$106

Roundtrip

found 15 hours ago

Select Frontier Airlines flight, departing Sat, Nov 21 from Oakland Intl. to Ontario Intl. Airport, returning Fri, Dec 4, priced at $106 found 15 hours ago

Tue, Nov 10 - Thu, Nov 12

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$110 Roundtrip, found 1 day ago

$110

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Nov 10 from Denver Intl. to Ontario Intl. Airport, returning Thu, Nov 12, priced at $110 found 1 day ago

Sat, Dec 12 - Wed, Dec 16

PHX

Sky Harbor Intl.

ONT

Ontario Intl. Airport

$114 Roundtrip, found 7 hours ago

$114

Roundtrip

found 7 hours ago

Select Frontier Airlines flight, departing Sat, Dec 12 from Sky Harbor Intl. to Ontario Intl. Airport, returning Wed, Dec 16, priced at $114 found 7 hours ago