$29 Cheap United flights San Francisco (SFO) to Ontario (ONT)

Apply the “Price (lowest to highest)” filter on Expedia to find cheap United Airlines round-trip flights from $52 from SFO to ONT. Affordable one-way fares from $29 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the least expensive months to jet off to Ontario with United Airlines. You could also find great prices on one-way and return tickets in April.

Begin your search one to three months ahead of your departure date to find cheaper fares on United Airlines flights from San Francisco Intl. Airport (SFO) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get the timing right, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Easily travel from San Francisco Intl. Airport (SFO) to Los Angeles - Ontario Intl. Airport (ONT) on any of United Airlines’s 18 direct weekly flights. Apply our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll take you to ONT at your preferred time.

On average, it takes 1h 29m to travel nonstop from San Francisco Intl. Airport (SFO) to Los Angeles - Ontario Intl. Airport (ONT) with United Airlines.

United Airlines operates the most flights from San Francisco Intl. Airport (SFO) to Los Angeles - Ontario Intl. Airport (ONT) on Thursday. With up to 3 daily departures, you’ll get the most flexibility on this day.

The first United Airlines flight from SFO to ONT departs at 8:25AM UTC-8, touching down at 9:51AM UTC-8. If you prefer to jet off later in the day, the last United Airlines flight leaves SFO at 7:00PM UTC-8 and lands at ONT at 8:29PM UTC-8. Flying earlier is often a wise choice as morning flights tend to experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Los Angeles - Ontario Intl. Airport (ONT) is the main Ontario hub for United Airlines flights from San Francisco Intl. Airport (SFO). Los Angeles Intl. Airport (LAX) and John Wayne Airport (SNA) are alternative possibilities. When organizing your trip through Expedia, check the “All Airports” option for your destination to see all available choices.

Travel from SFO to ONT with United Airlines and you’ll enjoy a range of benefits including a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

United Airlines generally flies Embraer 175 planes for flights from San Francisco Intl. Airport (SFO) to Los Angeles - Ontario Intl. Airport (ONT). This carrier also operates the Airbus A320 on this route. Remember that aircraft type can vary due to operational reasons, so the plane you catch might be different when you leave.

It’s generally possible to modify or cancel your flight, although additional fees may apply if you made your booking more than 24 hours ago. Prefer to keep your options open? Use Expedia’s “Changes included” or “No cancel fee” filter to find flights that won’t charge extra if you need to adjust your plans. To make changes, head to “Trips,” select your flight and click on “Manage Booking” for further information.