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

Thu, Aug 20 - Tue, Aug 25

DEN

Denver Intl.

ONT

Ontario Intl. Airport

$56 Roundtrip, found 1 day ago

$56

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Aug 20 from Denver Intl. to Ontario Intl. Airport, returning Tue, Aug 25, priced at $56 found 1 day ago

Wed, Jun 3 - Tue, Jun 9

SFO

San Francisco Intl.

ONT

Ontario Intl. Airport

$58 Roundtrip, found 1 day ago

$58

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jun 3 from San Francisco Intl. to Ontario Intl. Airport, returning Tue, Jun 9, priced at $58 found 1 day ago

Sat, Jun 6 - Tue, Jun 9

SEA

Seattle - Tacoma Intl.

ONT

Ontario Intl. Airport

$101 Roundtrip, just found

$101

Roundtrip

just found

Select Frontier Airlines flight, departing Sat, Jun 6 from Seattle - Tacoma Intl. to Ontario Intl. Airport, returning Tue, Jun 9, priced at $101 just found

Wed, Jun 10 - Sat, Jun 13

PHX

Sky Harbor Intl.

ONT

Ontario Intl. Airport

$198 Roundtrip, found 4 days ago

$198

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Wed, Jun 10 from Sky Harbor Intl. to Ontario Intl. Airport, returning Sat, Jun 13, priced at $198 found 4 days ago