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

Thu, May 28 - Tue, Jun 9

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$56 Roundtrip, found 6 hours ago

$56

Roundtrip

found 6 hours ago

Select Frontier Airlines flight, departing Thu, May 28 from San Francisco Intl. to Ontario Intl. Airport, returning Tue, Jun 9, priced at $56 found 6 hours ago

Wed, May 27 - Wed, Jun 10

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$58 Roundtrip, found 10 hours ago

$58

Roundtrip

found 10 hours ago

Select Frontier Airlines flight, departing Wed, May 27 from Denver Intl. to Ontario Intl. Airport, returning Wed, Jun 10, priced at $58 found 10 hours ago

Thu, May 28 - Mon, Jun 8

SEA

Seattle - Tacoma Intl.

ONT

Ontario Intl. Airport

$90 Roundtrip, found 2 hours ago

$90

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Thu, May 28 from Seattle - Tacoma Intl. to Ontario Intl. Airport, returning Mon, Jun 8, priced at $90 found 2 hours ago

Fri, May 29 - Sat, May 30

PDX

Portland Intl.

ONT

Ontario Intl. Airport

$195 Roundtrip, found 15 hours ago

$195

Roundtrip

found 15 hours ago

Select Frontier Airlines flight, departing Fri, May 29 from Portland Intl. to Ontario Intl. Airport, returning Sat, May 30, priced at $195 found 15 hours ago