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

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

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

The cheapest flights to San Francisco Intl. found within the past 7 days were CA $428 round trip and CA $236 one way. Prices and availability subject to change. Additional terms may apply.

Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $428 Roundtrip, found 4 days ago
CA $428
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $428 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $434 Roundtrip, found 4 days ago
CA $434
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $434 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $457 Roundtrip, found 4 days ago
CA $457
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $457 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $463 Roundtrip, found 4 days ago
CA $463
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $463 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $466 Roundtrip, found 4 days ago
CA $466
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $466 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $472 Roundtrip, found 4 days ago
CA $472
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $472 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $494 Roundtrip, found 4 days ago
CA $494
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $494 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $498 Roundtrip, found 4 days ago
CA $498
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $498 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $500 Roundtrip, found 4 days ago
CA $500
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $500 found 4 days ago
Thu, Mar 5 - Mon, Mar 9
ONT
Ontario
SFO
San Francisco
CA $503 Roundtrip, found 4 days ago
CA $503
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Mar 5 from Ontario to San Francisco, returning Mon, Mar 9, priced at CA $503 found 4 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.

Popular Flight Routes from Ontario (ONT)

Travelers at ONT love to visit these top cities. Roam to the top destinations from Ontario (ONT) today with the cheap prices from Travelocity!

Popular Flight Routes from San Francisco (SFO)

Travelers at SFO love to visit these top cities. Roam to the top destinations from San Francisco(SFO) today with the cheap prices from Travelocity!

*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.