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 $684 round trip and CA $289 one way. Prices and availability subject to change. Additional terms may apply.

Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $684 Roundtrip, found 3 days ago
CA $684
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $684 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $691 Roundtrip, found 3 days ago
CA $691
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $691 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $715 Roundtrip, found 3 days ago
CA $715
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $715 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $721 Roundtrip, found 3 days ago
CA $721
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $721 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $742 Roundtrip, found 3 days ago
CA $742
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $742 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $749 Roundtrip, found 3 days ago
CA $749
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $749 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $774 Roundtrip, found 3 days ago
CA $774
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $774 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $782 Roundtrip, found 3 days ago
CA $782
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $782 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $789 Roundtrip, found 3 days ago
CA $789
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $789 found 3 days ago
Thu, May 28 - Thu, Jun 4
ONT
Ontario
SFO
San Francisco
CA $805 Roundtrip, found 3 days ago
CA $805
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, May 28 from Ontario to San Francisco, returning Thu, Jun 4, priced at CA $805 found 3 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.