Cheap Flights from Ontario to San Francisco from £12️ (ONT-SFO)

Flights from Ontario to San Francisco

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Flights from Ontario to San Francisco Starting at CNY 12

We've found these cheap flights for you. You can book one-way or return flight tickets.

One way
Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

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Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Ontario to San Francisco

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines

From £12

Southwest Airlines

From £58

United Airlines

From £74

Alaska Airlines

From £96

American Airlines

From £161

Delta Air Lines

From £247

ANA airlines

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Alternative Routes from Ontario to San Francisco

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Ontario to San Francisco.

Cheapest
ONT
07:58
1h 27m
Direct
SFO
09:25
Ontario International Airport - San Francisco International Airport
Wed, Apr 24Frontier Airlines
£12
ONT
07:58
1h 27m
Direct
SFO
09:25
Ontario International Airport - San Francisco International Airport
Wed, Apr 24Frontier Airlines
£12
Find More Flights

How do I find the cheapest flights?

When are flight tickets from Ontario (ONT) to San Francisco (SFO) the cheapest?
Airlines adjust prices for flights from Ontario to San Francisco based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from Ontario (ONT) to San Francisco (SFO) cost?
According to Trip.com's data, the lowest price is around £110.
What is the transportation method from the main airport to downtown in San Francisco?
- The distance from San Francisco International Airport to downtown is about 17km, by taxi about 30 minutes.
What's the most popular airline for direct flights from Ontario (ONT) to San Francisco (SFO)?
Alaska Airlines operates 1 direct flights from Ontario (ONT) to San Francisco (SFO).
How many airports in San Francisco (SFO)?
There are 1 airport(s) in San Francisco (SFO): San Francisco International Airport.

How to find a cheap flight from Ontario to San Francisco

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to San Francisco. Book your flights at the right time and save more.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

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Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

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Flight Information from Ontario to San Francisco

Cheapest direct flight price	£11
Cheapest return ticket price	£26
Cheapest month	February
Peak season for travel	February
Flight distance	12,799.42km
Popular airline	United Airlines