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 $513 round trip and CA $136 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $513 Roundtrip, just found
CA $513
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $513 just found
Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $521 Roundtrip, just found
CA $521
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $521 just found
Sat, Nov 7 - Wed, Nov 11
ONT
Ontario
SFO
San Francisco
CA $527 Roundtrip, found 11 hours ago
CA $527
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sat, Nov 7 from Ontario to San Francisco, returning Wed, Nov 11, priced at CA $527 found 11 hours ago
Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $534 Roundtrip, just found
CA $534
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $534 just found
Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $542 Roundtrip, just found
CA $542
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $542 just found
Sat, Nov 7 - Wed, Nov 11
ONT
Ontario
SFO
San Francisco
CA $548 Roundtrip, found 11 hours ago
CA $548
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sat, Nov 7 from Ontario to San Francisco, returning Wed, Nov 11, priced at CA $548 found 11 hours ago
Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $556 Roundtrip, just found
CA $556
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $556 just found
Sat, Sep 19 - Tue, Sep 22
ONT
Ontario
SFO
San Francisco
CA $563 Roundtrip, just found
CA $563
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 19 from Ontario to San Francisco, returning Tue, Sep 22, priced at CA $563 just found
Fri, Nov 6 - Tue, Nov 10
ONT
Ontario
SFO
San Francisco
CA $578 Roundtrip, found 12 hours ago
CA $578
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Fri, Nov 6 from Ontario to San Francisco, returning Tue, Nov 10, priced at CA $578 found 12 hours ago
Fri, Oct 16 - Mon, Oct 19
ONT
Ontario
SFO
San Francisco
CA $579 Roundtrip, found 12 hours ago
CA $579
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Fri, Oct 16 from Ontario to San Francisco, returning Mon, Oct 19, priced at CA $579 found 12 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.

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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.