$39 Cheap United flights Ontario (ONT) to San Francisco (SFO)

View $39 flight on Tue, Nov 4, 2025Opens in a new window

$39 Cheap United flights Ontario (ONT) to San Francisco (SFO)

Prices were available within the past 7 days and start at $39 for one-way flights and $81 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Dec 3 - Thu, Dec 11
ONT
Ontario
SFO
San Francisco
$81 Roundtrip, found 1 hour ago
$81
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Dec 3 from Ontario to San Francisco, returning Thu, Dec 11, priced at $81 found 1 hour ago
United
Thu, Dec 4 - Fri, Dec 5
ONT
Ontario
SFO
San Francisco
$88 Roundtrip, found 8 hours ago
$88
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Dec 4 from Ontario to San Francisco, returning Fri, Dec 5, priced at $88 found 8 hours ago
United
Wed, Nov 12 - Wed, Nov 19
ONT
Ontario
SFO
San Francisco
$99 Roundtrip, found 3 hours ago
$99
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Nov 12 from Ontario to San Francisco, returning Wed, Nov 19, priced at $99 found 3 hours ago
United
Tue, Dec 9 - Wed, Dec 17
ONT
Ontario
SFO
San Francisco
$102 Roundtrip, found 1 hour ago
$102
Roundtrip
found 1 hour ago
Select United flight, departing Tue, Dec 9 from Ontario to San Francisco, returning Wed, Dec 17, priced at $102 found 1 hour ago
United
Wed, Dec 3 - Thu, Dec 11
ONT
Ontario
SFO
San Francisco
$106 Roundtrip, found 1 hour ago
$106
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Dec 3 from Ontario to San Francisco, returning Thu, Dec 11, priced at $106 found 1 hour ago
United
Tue, Dec 9 - Thu, Dec 11
ONT
Ontario
SFO
San Francisco
$111 Roundtrip, found 14 hours ago
$111
Roundtrip
found 14 hours ago
Select United flight, departing Tue, Dec 9 from Ontario to San Francisco, returning Thu, Dec 11, priced at $111 found 14 hours ago

Frequently asked questions

How much is a United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO)?
Apply the "Price (lowest to highest)" filter on Expedia to find cheap United Airlines round-trip flights from $81 from ONT to SFO. Affordable one-way tickets from $39 are also on offer.**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.
What is the cheapest month to fly from ONT to SFO with United Airlines?
Browse for return or one-way flights to San Francisco in February or April. You could find cheaper fares with United Airlines during these off-season months.
What is the cheapest time to book flights from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO) with United Airlines?
To find cheap United Airlines fares from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the price you pay. Sunday is typically the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey on a Sunday.**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.
Does United Airlines fly nonstop from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO)?
United Airlines operates direct flights from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO), with 18 weekly departures. Simply use the "Nonstop" and "Airline" filters while searching on Expedia to see all direct United Airlines flights to SFO.
How long does it take to fly from ONT to SFO with United Airlines?
From takeoff to touchdown, a nonstop United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO) takes approximately 1h 33m.
Which day of the week has the most United Airlines flights from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO)?
United Airlines has the most flights from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO) on Wednesday. With up to 3 daily departures, you'll get the most options and flexibility on this day.
What is the earliest United Airlines flight from ONT to SFO?
Jetting off from ONT at 6:15AM UTC-8, the earliest United Airlines flight to SFO lands at 7:46AM UTC-8. Flying early means you're less likely to encounter cancellations or delays.* Prefer to travel later? The last United Airlines flight from ONT to SFO departs at 6:38PM UTC-8 and touches down at 8:19PM UTC-8.*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.
What airports does United Airlines fly into in San Francisco?
San Francisco Intl. Airport (SFO) is the main San Francisco hub for United Airlines flights from Los Angeles - Ontario Intl. Airport (ONT). Norman Y. Mineta San Jose Intl. Airport (SJC) and Oakland Intl. Airport (OAK) are alternative possibilities. When planning your trip through Expedia, choose the "All Airports" option for your destination to see exactly what's available.
Why fly with United Airlines from ONT to SFO?
With a rewarding loyalty program, United Airlines is a top choice for many travelers flying from ONT to SFO. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO)?
United Airlines usually flies Airbus A319 planes for flights from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO). This airline also operates the Airbus A320 on this route. Remember that aircraft type can change depending on operational needs, so the plane you board could be different on the day you travel.
Can I change or cancel my United Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco Intl. Airport (SFO)?
In most cases, you can reschedule or cancel your flight, although there may be additional fees if your booking was made more than 24 hours ago. Prefer to keep your options open? Make use of our "Changes included" or "No cancel fee" filter to find flights that won't charge extra if you need to revise your plans. To update your booking, go to "Trips," select your flight and click on "Manage Booking" for further information.

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
San Francisco Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
United
Distance
363 mi
Average flight time
1 hour 23 mins

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*Available to One Key members.