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

Thu, Dec 3 - Wed, Dec 16

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$53 Roundtrip, found 4 hours ago

$53

Roundtrip

found 4 hours ago

Select Frontier Airlines flight, departing Thu, Dec 3 from San Francisco Intl. to Ontario Intl. Airport, returning Wed, Dec 16, priced at $53 found 4 hours ago

Thu, Dec 3 - Tue, Dec 15

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$58 Roundtrip, found 15 hours ago

$58

Roundtrip

found 15 hours ago

Select Frontier Airlines flight, departing Thu, Dec 3 from Denver Intl. to Ontario Intl. Airport, returning Tue, Dec 15, priced at $58 found 15 hours ago

Wed, Nov 11 - Tue, Nov 24

OAK

Oakland Intl.

ONT

Ontario Intl. Airport

$127 Roundtrip, found 22 hours ago

$127

Roundtrip

found 22 hours ago

Select Frontier Airlines flight, departing Wed, Nov 11 from Oakland Intl. to Ontario Intl. Airport, returning Tue, Nov 24, priced at $127 found 22 hours ago

Sat, Dec 12 - Wed, Dec 16

PHX

Sky Harbor Intl.

ONT

Ontario Intl. Airport

$168 Roundtrip, found 1 hour ago

$168

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Sat, Dec 12 from Sky Harbor Intl. to Ontario Intl. Airport, returning Wed, Dec 16, priced at $168 found 1 hour ago