FFL Helper
Ontario ONT
$158
OAK → ONT · Frontier Airlines
FFL Helper / Oakland / Ontario / September 2026
OAK → ONT · 2026-09
Oakland to Ontario in September 2026
Dated one-way fares from Oakland to Ontario in September 2026. Use the calendar to see which days are cheaper.
Lowest this month
$158
Highest this month
$158
Sample fare
$158
Airports
OAK–ONT
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Other months: September 2026 · Full route
September 2026 price calendar
September 2026
From $158
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$158
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Dated fares
Booking OAK to ONT in September 2026
This page is only September 2026 on the Oakland to Ontario route. Open the full route if you want the next months side by side.
Prices move as seats sell. Confirm the live itinerary before you book Oakland to Ontario in September 2026.