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

Fri, Dec 4 - Mon, Dec 7

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$53 Roundtrip, just found

$53

Roundtrip

just found

Select Frontier Airlines flight, departing Fri, Dec 4 from San Francisco Intl. to Ontario Intl. Airport, returning Mon, Dec 7, priced at $53 just found

Fri, Dec 4 - Mon, Dec 14

SFO

San Francisco Intl.

SNA

John Wayne

$58 Roundtrip, found 5 hours ago

$58

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Fri, Dec 4 from San Francisco Intl. to John Wayne, returning Mon, Dec 14, priced at $58 found 5 hours ago

Sat, Nov 21 - Sat, Dec 5

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$77 Roundtrip, found 5 hours ago

$77

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Sat, Nov 21 from Denver Intl. to Ontario Intl. Airport, returning Sat, Dec 5, priced at $77 found 5 hours ago

Thu, Oct 29 - Thu, Nov 5

SEA

Seattle - Tacoma Intl.

ONT

Ontario Intl. Airport

$98 Roundtrip, found 17 hours ago

$98

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Thu, Oct 29 from Seattle - Tacoma Intl. to Ontario Intl. Airport, returning Thu, Nov 5, priced at $98 found 17 hours ago