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

Tue, Aug 25 - Wed, Aug 26

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$56 Roundtrip, found 4 hours ago

$56

Roundtrip

found 4 hours ago

Select Frontier Airlines flight, departing Tue, Aug 25 from Denver Intl. to Ontario Intl. Airport, returning Wed, Aug 26, priced at $56 found 4 hours ago

Mon, Jul 13 - Thu, Jul 16

PHX

Sky Harbor Intl.

SNA

John Wayne

$56 Roundtrip, found 8 hours ago

$56

Roundtrip

found 8 hours ago

Select Frontier Airlines flight, departing Mon, Jul 13 from Sky Harbor Intl. to John Wayne, returning Thu, Jul 16, priced at $56 found 8 hours ago

Tue, Jun 2 - Sat, Jun 6

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$56 Roundtrip, found 5 hours ago

$56

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Tue, Jun 2 from San Francisco Intl. to Ontario Intl. Airport, returning Sat, Jun 6, priced at $56 found 5 hours ago

Sat, Jun 6 - Tue, Jun 9

SEA

Seattle - Tacoma Intl.

ONT

Ontario Intl. Airport

$131 Roundtrip, found 2 hours ago

$131

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Sat, Jun 6 from Seattle - Tacoma Intl. to Ontario Intl. Airport, returning Tue, Jun 9, priced at $131 found 2 hours ago