San Francisco (SFO) to Ontario (ONT) flight deal from $39 USD in economy class – flightdeals.net

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United Airlines

UAUnited Airlines

One Way•Economy

San Francisco International Airport

San Francisco, United States

Ontario International Airport

Ontario, United States

$129 USD

-70%$39 USD

Verified Nov 6, 2025 at 7:38 AM

December 2025

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1$140 2$140 3$39 4$39 5$89 6$39 7$89 8$39 9$39 10$39 11$86 12$89 13$77 14$39 15$39 16$39 17$39 18$199 19$224 20$283 21$169 22$199 23$261 24$204 25$251 26$155 27$130 28$155 29$130 30$105 31$75 1 2 3 4

Extremely Rare Availability

4% of dates checked are available within 10% of the lowest price

Saturday, December 27th, 2025

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