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

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

The cheapest flights to Ontario Intl. Airport found within the past 7 days were CA $604 round trip and CA $151 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Jul 14 - Tue, Jul 21
SFO
San Francisco
ONT
Ontario
CA $604 Roundtrip, found 2 days ago
CA $604
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Jul 14 from San Francisco to Ontario, returning Tue, Jul 21, priced at CA $604 found 2 days ago
Wed, Aug 5 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $639 Roundtrip, found 5 days ago
CA $639
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Aug 5 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $639 found 5 days ago
Fri, Oct 16 - Sun, Oct 18
SFO
San Francisco
ONT
Ontario
CA $647 Roundtrip, found 3 days ago
CA $647
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Fri, Oct 16 from San Francisco to Ontario, returning Sun, Oct 18, priced at CA $647 found 3 days ago
Wed, Aug 5 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $654 Roundtrip, found 5 days ago
CA $654
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Aug 5 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $654 found 5 days ago
Tue, Jul 14 - Tue, Jul 21
SFO
San Francisco
ONT
Ontario
CA $661 Roundtrip, found 2 days ago
CA $661
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Jul 14 from San Francisco to Ontario, returning Tue, Jul 21, priced at CA $661 found 2 days ago
Wed, Aug 5 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $674 Roundtrip, found 5 days ago
CA $674
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Aug 5 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $674 found 5 days ago
Wed, Aug 5 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $677 Roundtrip, found 5 days ago
CA $677
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Aug 5 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $677 found 5 days ago
Wed, Aug 5 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $682 Roundtrip, found 5 days ago
CA $682
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Aug 5 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $682 found 5 days ago
Thu, Aug 6 - Mon, Aug 10
SFO
San Francisco
ONT
Ontario
CA $687 Roundtrip, found 1 hour ago
CA $687
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Aug 6 from San Francisco to Ontario, returning Mon, Aug 10, priced at CA $687 found 1 hour ago
Tue, Jul 7 - Wed, Jul 8
SFO
San Francisco
ONT
Ontario
CA $688 Roundtrip, found 5 days ago
CA $688
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Jul 7 from San Francisco to Ontario, returning Wed, Jul 8, priced at CA $688 found 5 days ago

Frequently asked questions

Are there direct flights from SFO to Los Angeles - Ontario Intl. Airport (ONT)?
Sometimes, a trip is all about the journey; other times, the magic is in the destination. But if you just want to get to where you're going fast, multiple airlines operate direct flights from SFO to ONT, including United Airlines and Frontier Airlines.
What airlines fly from SFO to ONT?
You can take your pick from several airlines that fly direct between San Francisco and Ontario. United Airlines (UA) is one of the most popular. This carrier operates approximately 139 flights every month. Another good option is Frontier Airlines (F9), which has 17 flights every month. The more airlines you take into account, the more likely you are to walk away with a fantastic deal.
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.