Cheap Flights From Ontario Intl. Airport (ONT) To San Francisco Intl. (SFO)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

Cheapest Flights from Ontario Intl. Airport (ONT) to San Francisco (SFO)

The cheapest flights to San Francisco Intl. found within the past 7 days were CA $54 round trip and CA $27 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Dec 5 - Sat, Dec 12
ONT
Ontario
SFO
San Francisco
CA $54 Roundtrip, found 23 hours ago
CA $54
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to San Francisco, returning Sat, Dec 12, priced at CA $54 found 23 hours ago
Thu, Jan 14 - Mon, Jan 18
ONT
Ontario
SFO
San Francisco
CA $68 Roundtrip, found 19 hours ago
CA $68
Roundtrip
found 19 hours ago
Select Frontier Airlines flight, departing Thu, Jan 14 from Ontario to San Francisco, returning Mon, Jan 18, priced at CA $68 found 19 hours ago
Thu, Dec 10 - Sun, Dec 13
ONT
Ontario
SFO
San Francisco
CA $74 Roundtrip, found 22 hours ago
CA $74
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Thu, Dec 10 from Ontario to San Francisco, returning Sun, Dec 13, priced at CA $74 found 22 hours ago
Fri, Nov 13 - Fri, Nov 20
ONT
Ontario
SFO
San Francisco
CA $81 Roundtrip, found 1 day ago
CA $81
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Nov 13 from Ontario to San Francisco, returning Fri, Nov 20, priced at CA $81 found 1 day ago
Sat, Dec 5 - Sat, Dec 12
ONT
Ontario
SFO
San Francisco
CA $106 Roundtrip, found 23 hours ago
CA $106
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to San Francisco, returning Sat, Dec 12, priced at CA $106 found 23 hours ago
Sat, Dec 5 - Sat, Dec 12
ONT
Ontario
SFO
San Francisco
CA $107 Roundtrip, found 23 hours ago
CA $107
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to San Francisco, returning Sat, Dec 12, priced at CA $107 found 23 hours ago
Sat, Dec 5 - Sat, Dec 12
ONT
Ontario
SFO
San Francisco
CA $109 Roundtrip, found 23 hours ago
CA $109
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to San Francisco, returning Sat, Dec 12, priced at CA $109 found 23 hours ago
Sat, Dec 5 - Sat, Dec 12
ONT
Ontario
SFO
San Francisco
CA $113 Roundtrip, found 23 hours ago
CA $113
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to San Francisco, returning Sat, Dec 12, priced at CA $113 found 23 hours ago
Fri, Nov 20 - Mon, Nov 23
ONT
Ontario
SFO
San Francisco
CA $114 Roundtrip, found 23 hours ago
CA $114
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Fri, Nov 20 from Ontario to San Francisco, returning Mon, Nov 23, priced at CA $114 found 23 hours ago
Thu, Jan 14 - Mon, Jan 18
ONT
Ontario
SFO
San Francisco
CA $116 Roundtrip, found 19 hours ago
CA $116
Roundtrip
found 19 hours ago
Select Frontier Airlines flight, departing Thu, Jan 14 from Ontario to San Francisco, returning Mon, Jan 18, priced at CA $116 found 19 hours ago

Frequently asked questions

Are there direct flights from Ontario Airport to San Francisco Intl. Airport (SFO)?
Multiple airlines operate flights straight from ONT to San Francisco Airport. Among these are United Airlines and Frontier Airlines — look into them if you'd like to touch down at San Francisco with minimal fuss.
What airlines fly from Los Angeles - Ontario Intl. Airport (ONT) to SFO?
You'll find several airlines offering direct flights between Ontario and San Francisco. United Airlines (UA) is one of the most liked. This carrier operates approximately 143 flights every month. You'll want to also check out the deals available through Frontier Airlines (F9). Another leading carrier, it operates 17 flights each month on the Ontario to San Francisco route. Be sure to compare the two to find your ideal fare.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Explore More Ways to Travel with Travelocity

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.