S$ 21 Cheap Flights from Ontario to San Francisco (ONT-SFO)

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Cheap Flights from Ontario to San Francisco starting at S$ 21

Book one-way or return flights from Ontario to San Francisco from as little as S$ 21. Choose from the popular airlines below and book your flight today!

One way
Round-trip

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

Searching for the best last minute flight from Ontario to San Francisco? Find one-way or return flights that are affordable and fit your itinerary.

Trip.com monitors the ticket fares of flights from Ontario to San Francisco. Stay updated on price trends and snag the best deals for your upcoming trip.

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

Cheapest Airlines flying from Ontario to San Francisco

View airlines operating flights 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 S$ 21

Southwest Airlines

From S$ 98

United Airlines

From S$ 125

American Airlines

From S$ 174

Delta Air Lines

From S$ 313

Alaska Airlines

From S$ 700

ANA airlines

Find more flights and airlines

Alternative Routes from Ontario to San Francisco

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Ontario to San Francisco.

Cheapest
ONT
17:59
1h 28m
Direct
SFO
19:27
Ontario International Airport - San Francisco International Airport
Sat, May 11Frontier Airlines
S$ 21
ONT
17:59
1h 28m
Direct
SFO
19:27
Ontario International Airport - San Francisco International Airport
Sat, May 11Frontier Airlines
S$ 21
Find More Flights

Frequently Asked Questions

When to buy 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 is a flight from Ontario (ONT) to San Francisco (SFO) cost?
According to Trip.com's data, the lowest price is around S$ 181.
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?
There are 1 airports near San Francisco: 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

Check airline and travel agency websites for latest flight deals

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	S$ 20
Cheapest return ticket price	S$ 45
Cheapest month	February
Peak season for travel	February
Flight distance	12,799.42km
Popular airline	Frontier Airlines