Cheap flight from Ontario to San Francisco from $34
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Flights from Ontario to San Francisco
Cheap flight deals from Ontario to San Francisco
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
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Round-trip
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One way
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Cheapest nonstop
ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Thu, May 8 | Frontier Airlines
SFO 2:18 PM1h 37mNonstopSIN 3:55 PMSan Francisco - Ontario | Sat, May 10 | Frontier Airlines$50 $22878% OFF78% OFF$228 $50 -
ONT 9:41 PM1h 34mNonstopSFO 11:15 PMOntario - San Francisco | Sun, Jun 8 | Frontier Airlines
SFO 10:11 PM1h 28mNonstopSIN 11:39 PMSan Francisco - Ontario | Mon, Jun 9 | Frontier Airlines$50 $22878% OFF78% OFF$228 $50
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ONT 9:41 PM1h 30mNonstopSFO 11:11 PMOntario - San Francisco | Sat, May 31 | Frontier Airlines
SFO 10:11 PM1h 28mNonstopSIN 11:39 PMSan Francisco - Ontario | Sun, Jun 1 | Frontier Airlines$57 $22875% OFF75% OFF$228 $57
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ONT 9:41 PM1h 34mNonstopSFO 11:15 PMOntario - San Francisco | Mon, Jun 2 | Frontier Airlines
SFO 10:11 PM1h 28mNonstopSIN 11:39 PMSan Francisco - Ontario | Mon, Jun 9 | Frontier Airlines$7069% OFF$228 $70
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sat, May 10 | Frontier Airlines
SFO 8:34 AM1h 28mNonstopSIN 10:02 AMSan Francisco - Ontario | Mon, May 12 | Frontier Airlines$9160% OFF$228 $91
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sun, May 11 | Frontier Airlines
SFO 2:18 PM1h 37mNonstopSIN 3:55 PMSan Francisco - Ontario | Wed, May 14 | Frontier Airlines$10156% OFF$228 $101
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Mon, May 12 | Frontier Airlines
SFO 2:18 PM1h 37mNonstopSIN 3:55 PMSan Francisco - Ontario | Mon, May 19 | Frontier Airlines$12545% OFF$228 $125
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Fri, May 9 | Frontier Airlines
SFO 8:34 AM1h 28mNonstopSIN 10:02 AMSan Francisco - Ontario | Mon, May 12 | Frontier Airlines$13640% OFF$228 $136
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sun, May 4 | Frontier Airlines
SFO 2:18 PM1h 37mNonstopSIN 3:55 PMSan Francisco - Ontario | Wed, May 7 | Frontier Airlines$16527% OFF$228 $165
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Mon, May 5 | Frontier Airlines
SFO 8:34 AM1h 28mNonstopSIN 10:02 AMSan Francisco - Ontario | Fri, May 9 | Frontier Airlines$2146% OFF$228 $214
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ONT 1:00 PM17h 25m1 stopsSFO Invalid DateOntario - San Francisco | Tue, May 6 | Normal Airline
SFO 3:00 PM6hNonstopONT 4:00 PMSan Francisco - Ontario | Thu, May 8 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
ONT 9:41 PM1h 34mNonstopSFO 11:15 PMOntario - San Francisco | Fri, Jun 6 | Frontier Airlines$34 $4830% OFF30% OFF$48 $34
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ONT 9:41 PM1h 30mNonstopSFO 11:11 PMOntario - San Francisco | Sat, May 31 | Frontier Airlines$35 $4828% OFF28% OFF$48 $35
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sat, May 17 | Frontier Airlines$35 $4828% OFF28% OFF$48 $35
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ONT 9:41 PM1h 30mNonstopSFO 11:11 PMOntario - San Francisco | Sun, May 25 | Frontier Airlines$3528% OFF$48 $35
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ONT 9:41 PM1h 30mNonstopSFO 11:11 PMOntario - San Francisco | Thu, May 29 | Frontier Airlines$3528% OFF$48 $35
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Thu, May 8 | Frontier Airlines$3919% OFF$48 $39
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Thu, May 15 | Frontier Airlines$448% OFF$48 $44
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sat, May 10 | Frontier Airlines$456% OFF$48 $45
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Mon, May 12 | Frontier Airlines$456% OFF$48 $45
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ONT 8:24 AM1h 38mNonstopSFO 10:02 AMOntario - San Francisco | Sun, May 11 | Frontier Airlines$456% OFF$48 $45
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ONT 1:00 PM17h 25m1 stopsSFO Invalid DateOntario - San Francisco | Tue, May 6 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
Flight Info | Ontario to San Francisco
| Cheapest one-way flight price | $25 |
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| Cheapest round-trip ticket price | $49 |
| Off-season for travel | February |
| Peak season for travel | February |
| Flight distance | 12,799.42 km |
| Popular airline | United Airlines |
When is the cheapest time to fly from Ontario to San Francisco?
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Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Frequently Asked Questions
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When are flight tickets from Ontario (ONT) to San Francisco (SFO) the cheapest?
Airlines adjust prices for flights from Ontario to San Francisco based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much do flights from Ontario (ONT) to San Francisco (SFO) cost?
According to Trip.com's data, the lowest price is around $137.
How to find a cheap flight from Ontario to San Francisco
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to San Francisco. Book your flights at the right time and save more.
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
Compare Flight Prices
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Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
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