£84 Cheap Flights from Ontario Intl. Airport (ONT) to San Francisco (SFO)

View £84 flight on Wed, 3 Jun 2026Opens in a new window

Flight 1

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to San Francisco International Airport (SFO)

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

Prices were available within the past 7 days and start at £84 for one-way flights and £153 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, 17 Jun - Tue, 23 Jun
ONT
Ontario
SFO
San Francisco
£153 Return, found 7 hours ago
£153
Return
found 7 hours ago
Select United flight, departing Wed, 17 Jun from Ontario to San Francisco, returning Tue, 23 Jun, priced at £153 found 7 hours ago
United
Wed, 3 Jun - Tue, 9 Jun
ONT
Ontario
SFO
San Francisco
£167 Return, found 6 days ago
£167
Return
found 6 days ago
Select United flight, departing Wed, 3 Jun from Ontario to San Francisco, returning Tue, 9 Jun, priced at £167 found 6 days ago
United
Tue, 16 Jun - Tue, 23 Jun
ONT
Ontario
SFO
San Francisco
£202 Return, found 7 hours ago
£202
Return
found 7 hours ago
Select United flight, departing Tue, 16 Jun from Ontario to San Francisco, returning Tue, 23 Jun, priced at £202 found 7 hours ago
United
Wed, 3 Jun - Wed, 10 Jun
ONT
Ontario
SFO
San Francisco
£210 Return, found 6 days ago
£210
Return
found 6 days ago
Select United flight, departing Wed, 3 Jun from Ontario to San Francisco, returning Wed, 10 Jun, priced at £210 found 6 days ago
United
Wed, 17 Jun - Thu, 18 Jun
ONT
Ontario
SFO
San Francisco
£213 Return, found 7 hours ago
£213
Return
found 7 hours ago
Select United flight, departing Wed, 17 Jun from Ontario to San Francisco, returning Thu, 18 Jun, priced at £213 found 7 hours ago
United
Wed, 3 Jun - Tue, 9 Jun
ONT
Ontario
SFO
San Francisco
£219 Return, found 6 days ago
£219
Return
found 6 days ago
Select United flight, departing Wed, 3 Jun from Ontario to San Francisco, returning Tue, 9 Jun, priced at £219 found 6 days ago
Alaska Airlines
Tue, 2 Jun - Sat, 6 Jun
ONT
Ontario
SFO
San Francisco
£308 Return, found 3 days ago
£308
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 2 Jun from Ontario to San Francisco, returning Sat, 6 Jun, priced at £308 found 3 days ago
American Airlines
Fri, 19 Jun - Tue, 23 Jun
ONT
Ontario
SFO
San Francisco
£357 Return, found 7 hours ago
£357
Return
found 7 hours ago
Select American Airlines flight, departing Fri, 19 Jun from Ontario to San Francisco, returning Tue, 23 Jun, priced at £357 found 7 hours ago
Delta
Tue, 16 Jun - Wed, 24 Jun
ONT
Ontario
SFO
San Francisco
£357 Return, found 7 hours ago
£357
Return
found 7 hours ago
Select Delta flight, departing Tue, 16 Jun from Ontario to San Francisco, returning Wed, 24 Jun, priced at £357 found 7 hours ago
JetBlue Airways
Tue, 2 Jun - Sat, 6 Jun
ONT
Ontario
SFO
San Francisco
£645 Return, found 3 days ago
£645
Return
found 3 days ago
Select JetBlue Airways flight, departing Tue, 2 Jun from Ontario to San Francisco, returning Sat, 6 Jun, priced at £645 found 3 days ago

Alternative airports near San Francisco

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Oakland Intl. OAK. Average driving time to city centre is 26 minutes. Flights from £472
OAK
Oakland Intl.
Average driving time to city centre26 min
Flights from £472

Frequently asked questions

How much does a flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) cost?
One-way flights typically cost between £174 and £1,371 and return flights often range between £450 and £1,873. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
April is typically the cheapest month to fly from Ontario International Airport (ONT) to San Francisco International Airport (SFO), with average return fares of approximately £276. This is about 18% lower than the average price throughout the year. April often sees lower prices as it's before the peak summer travel season, when demand tends to increase. Other cheap months to fly from Ontario International Airport (ONT) to San Francisco International Airport (SFO) include May and September.
Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Enter ONT to SFO and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) will differ from traveller to traveller. If you like to fly early, UA offers early morning flights. If price is the most important factor, F9 typically offers the lowest fares. WN offers the most daily flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) is April. This month offers a great balance, as it's one of the cheapest times to fly, with average return flights around £276. Plus, April is also a popular month for this route, meaning you'll have plenty of flight options to choose from. If you're looking for good value and a wide selection of flights, April is an excellent choice, based on booking data from the past year.
How many flights per day from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
When flying from Ontario International Airport (ONT) to San Francisco International Airport (SFO), you'll find approximately 5 nonstop flights per day. For even more choice, look at flights that include layovers, as there are around 59 connecting flights per day. Some common connection points include McCarran Intl. (LAS), Seattle - Tacoma Intl. (SEA), and Sky Harbor Intl. (PHX).
What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) typically departs at approximately 12:05 AM local time, operated by F9. This is a seasonal service active in May. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
You'll typically find the most flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) on a Friday, with around 44 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Alaska Airlines, and Delta Air Lines. Flight schedules are consistent throughout the week.
What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) are in the early morning, from 6am to 9am. About 28% of passengers prefer this time. Many major carriers, including Alaska Airlines, United Airlines and Southwest Airlines, offer flights during this window. This timing works well because you can get an early start to your day in San Francisco.
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Flying nonstop from ONT to SFO takes around 1 hour 30 minutes, with the route covering approximately 364 miles. Flights with a layover typically take 4 hours 50 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Select the "Business class" and "First class" filters when looking for ONT to SFO flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight with Expedia?
It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Francisco from Los Angeles - Ontario Intl. (ONT)?
If you're planning to travel to San Francisco from Los Angeles - Ontario Intl. (ONT), you can fly directly into San Francisco Intl. (SFO) Some flights may connect through major hubs like McCarran Intl. (LAS), Portland Intl. (PDX), Sonoma County (STS) before reaching San Francisco. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) at the last minute?
Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package?
Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ontario Intl. Airport
Destination airport
San Francisco Intl.
Airlines serving
United
Return price
£153
Distance
582 km
Average flight time
1 hour 32 mins

Book with confidence

Compare flights from Ontario Intl. Airport to San Francisco easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario Intl. Airport to San Francisco. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to San Francisco Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Ontario Intl. Airport to San Francisco Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Ontario Intl. Airport (ONT) to San Francisco Intl. (SFO)

The easiest way to view the best deals on flights from Ontario Intl. Airport to San Francisco today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Ontario Intl. Airport to San Francisco Intl. start at just £153 and range up to £645.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Ontario Intl. Airport and San Francisco
  • booking your flight during June, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ontario Intl. Airport to San Francisco flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Ontario Intl. Airport to San Francisco Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Ontario Intl. Airport to San Francisco easily and book with confidence

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