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

Wed, Oct 7 - Sun, Oct 11

SEA

Seattle - Tacoma Intl.

ONT

Ontario Intl. Airport

$62 Roundtrip, found 4 hours ago

$62

Roundtrip

found 4 hours ago

Select Frontier Airlines flight, departing Wed, Oct 7 from Seattle - Tacoma Intl. to Ontario Intl. Airport, returning Sun, Oct 11, priced at $62 found 4 hours ago

Tue, Oct 27 - Sat, Nov 14

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$63 Roundtrip, found 2 hours ago

$63

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Tue, Oct 27 from Denver Intl. to Ontario Intl. Airport, returning Sat, Nov 14, priced at $63 found 2 hours ago

Tue, Oct 6 - Thu, Oct 22

DFW

Dallas-Fort Worth Intl.

ONT

Ontario Intl. Airport

$85 Roundtrip, found 7 hours ago

$85

Roundtrip

found 7 hours ago

Select Frontier Airlines flight, departing Tue, Oct 6 from Dallas-Fort Worth Intl. to Ontario Intl. Airport, returning Thu, Oct 22, priced at $85 found 7 hours ago

Thu, Oct 8 - Sun, Oct 25

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$117 Roundtrip, found 4 hours ago

$117

Roundtrip

found 4 hours ago

Select Frontier Airlines flight, departing Thu, Oct 8 from San Francisco Intl. to Ontario Intl. Airport, returning Sun, Oct 25, priced at $117 found 4 hours ago