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

Home Premium Fare Deals About Pricing

United Airlines

UAUnited Airlines

One Way•Economy

Ontario International Airport

Ontario, United States

San Francisco International Airport

San Francisco, United States

$122 USD

-68%$39 USD

Verified Nov 2, 2025 at 4:16 PM

December 2025

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1$182 2$110 3$39 4$39 5$39 6$39 7$70 8$86 9$64 10$75 11$74 12$130 13$103 14$39 15$39 16$39 17$39 18$86 19$130 20$130 21$130 22$86 23$75 24$75 25$185 26$130 27$142 28$169 29$130 30$130 31$130 1 2 3 4

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Wednesday, December 3rd, 2025

Outbound Flights

·

→

·

→

·

→

1h 24m·Nonstop

$39 USD

United Airlines

ONTDec 3 06:00

→

SFODec 3 07:24

UA 277Boeing 737

1h 24m·Nonstop

$39 USD

United Airlines

ONTDec 3 13:50

→

SFODec 3 15:14

UA 1708Boeing 737MAX 8 Passenger

1h 24m·Nonstop

$100 USD

United Airlines

ONTDec 3 18:41

→

SFODec 3 20:05

UA 1341Airbus A319