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

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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 $426 round trip and CA $278 one way. Prices and availability subject to change. Additional terms may apply.

Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $426 Roundtrip, found 6 days ago
CA $426
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $426 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $461 Roundtrip, found 6 days ago
CA $461
Roundtrip
found 6 days ago
Select United flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $461 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $481 Roundtrip, found 6 days ago
CA $481
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $481 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $510 Roundtrip, found 6 days ago
CA $510
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $510 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $531 Roundtrip, found 6 days ago
CA $531
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $531 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $547 Roundtrip, found 6 days ago
CA $547
Roundtrip
found 6 days ago
Select United flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $547 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $564 Roundtrip, found 6 days ago
CA $564
Roundtrip
found 6 days ago
Select United flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $564 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $602 Roundtrip, found 6 days ago
CA $602
Roundtrip
found 6 days ago
Select United flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $602 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $612 Roundtrip, found 6 days ago
CA $612
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $612 found 6 days ago
Thu, May 7 - Wed, May 13
ONT
Ontario
SFO
San Francisco
CA $640 Roundtrip, found 6 days ago
CA $640
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 7 from Ontario to San Francisco, returning Wed, May 13, priced at CA $640 found 6 days 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.

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*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.