Cheap Flights From San Francisco Intl. (SFO) To Los Angeles - Ontario Intl. (ONT)

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Cheapest Flights from San Francisco (SFO) to Ontario (ONT)

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were CA $1,244 round trip and CA $287 one way. Prices and availability subject to change. Additional terms may apply.

Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,244 Roundtrip, found 2 days ago
CA $1,244
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,244 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,248 Roundtrip, found 2 days ago
CA $1,248
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,248 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,256 Roundtrip, found 2 days ago
CA $1,256
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,256 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,260 Roundtrip, found 2 days ago
CA $1,260
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,260 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,282 Roundtrip, found 2 days ago
CA $1,282
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,282 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,284 Roundtrip, found 2 days ago
CA $1,284
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,284 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,288 Roundtrip, found 2 days ago
CA $1,288
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,288 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,295 Roundtrip, found 2 days ago
CA $1,295
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,295 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,296 Roundtrip, found 2 days ago
CA $1,296
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,296 found 2 days ago
Thu, Apr 9 - Sun, Apr 12
SFO
San Francisco
ONT
Ontario
CA $1,317 Roundtrip, found 2 days ago
CA $1,317
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 9 from San Francisco to Ontario, returning Sun, Apr 12, priced at CA $1,317 found 2 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.