S$89 Cheap Flights from San Francisco to Ontario

View S$89 flight on Sat, 25 Oct, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 40% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

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

Prices were available within the past 7 days and start at S$89 for one-way flights and S$202 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, 4 Sep - Mon, 15 Sep
SFO
San Francisco
ONT
Ontario
S$202 Return, found 3 days ago
S$202
Return
found 3 days ago
Select United flight, departing Thu, 4 Sep from San Francisco to Ontario, returning Mon, 15 Sep, priced at S$202 found 3 days ago
United
Mon, 6 Oct - Thu, 9 Oct
SFO
San Francisco
ONT
Ontario
S$215 Return, found 4 days ago
S$215
Return
found 4 days ago
Select United flight, departing Mon, 6 Oct from San Francisco to Ontario, returning Thu, 9 Oct, priced at S$215 found 4 days ago
United
Sat, 6 Sep - Tue, 9 Sep
SFO
San Francisco
ONT
Ontario
S$228 Return, found 2 days ago
S$228
Return
found 2 days ago
Select United flight, departing Sat, 6 Sep from San Francisco to Ontario, returning Tue, 9 Sep, priced at S$228 found 2 days ago
American Airlines
Thu, 4 Sep - Mon, 15 Sep
SFO
San Francisco
ONT
Ontario
S$248 Return, found 3 days ago
S$248
Return
found 3 days ago
Select American Airlines flight, departing Thu, 4 Sep from San Francisco to Ontario, returning Mon, 15 Sep, priced at S$248 found 3 days ago
United
Fri, 3 Oct - Mon, 6 Oct
SFO
San Francisco
ONT
Ontario
S$267 Return, found 5 days ago
S$267
Return
found 5 days ago
Select United flight, departing Fri, 3 Oct from San Francisco to Ontario, returning Mon, 6 Oct, priced at S$267 found 5 days ago
United
Thu, 4 Sep - Mon, 15 Sep
SFO
San Francisco
ONT
Ontario
S$280 Return, found 3 days ago
S$280
Return
found 3 days ago
Select United flight, departing Thu, 4 Sep from San Francisco to Ontario, returning Mon, 15 Sep, priced at S$280 found 3 days ago
United
Thu, 11 Sep - Mon, 15 Sep
SFO
San Francisco
ONT
Ontario
S$281 Return, found 1 day ago
S$281
Return
found 1 day ago
Select United flight, departing Thu, 11 Sep from San Francisco to Ontario, returning Mon, 15 Sep, priced at S$281 found 1 day ago
United
Mon, 6 Oct - Thu, 9 Oct
SFO
San Francisco
ONT
Ontario
S$294 Return, found 4 days ago
S$294
Return
found 4 days ago
Select United flight, departing Mon, 6 Oct from San Francisco to Ontario, returning Thu, 9 Oct, priced at S$294 found 4 days ago
United
Mon, 6 Oct - Thu, 9 Oct
SFO
San Francisco
ONT
Ontario
S$318 Return, found 4 days ago
S$318
Return
found 4 days ago
Select United flight, departing Mon, 6 Oct from San Francisco to Ontario, returning Thu, 9 Oct, priced at S$318 found 4 days ago
Delta
Mon, 6 Oct - Thu, 9 Oct
SFO
San Francisco
ONT
Ontario
S$400 Return, found 4 days ago
S$400
Return
found 4 days ago
Select Delta flight, departing Mon, 6 Oct from San Francisco to Ontario, returning Thu, 9 Oct, priced at S$400 found 4 days ago

Find the cheapest month to fly from San Francisco (SFO) to Ontario (ONT)

January is typically the cheapest month to fly

From S$62 - S$427 per traveller.

Graph displaying average flight prices per month

San Francisco to Ontario route information
Origin airport
San Francisco Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$202
Distance
582 km
Average flight time
1 hour 25 mins

Perfect flights from San Francisco to Ontario

Your Journey from San Francisco to Ontario

Start your unforgettable journey with Expedia. Our broad selection of flights from San Francisco to Ontario caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including United, American Airlines, Delta. Our selection of flights from San Francisco Intl. to Los Angeles - Ontario Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with San Francisco to Ontario Flights

Experience the joy of finding cheap flights from San Francisco Intl. to Los Angeles - Ontario Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$89 and roundtrip prices from S$202*.
 

Pre-Flight Essentials

Ensure a smooth journey from San Francisco to Ontario with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant Ontario

Picture yourself stepping off the plane in Ontario and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your San Francisco to Ontario Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from San Francisco to Ontario.
 

Beyond the Flight – Exploring Ontario

With Expedia, your adventure extends beyond the flight. Explore Ontario at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from San Francisco to Ontario with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from San Francisco to Ontario with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

Frequently asked questions

How much is a flight from San Francisco Airport to Ontario Airport?
Start packing your bags, because round-trip journeys from San Francisco Intl. Airport (SFO) to Ontario Airport start from S$202. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can increase quickly, so book today to lock in the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from San Francisco Airport to Ontario Airport?
Each air carrier has its own terms and conditions. If you do decide to cancel, follow the easy instructions on our Customer Service Portal.
How do I find cheap flights from SFO to Ontario Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for San Francisco Intl. Airport (SFO) to ONT flights, you'll see a "no change fees" filter for you to select.
How far is the flight from San Francisco Intl. Airport (SFO) to Ontario Airport?
With a flight distance of 590 kilometres, it's just a short hop from SFO to Los Angeles - Ontario Intl. Airport (ONT). It might be a quick flight, but it's still worth bringing along something to keep you busy on board.
Which airlines fly direct from San Francisco Intl. Airport (SFO) to ONT?
United Airlines (UA) is a popular choice. It operates 121 flights from SFO to ONT each month. Another carrier operating on this route is Frontier Airlines (F9). You'll have 21 flights every month to take your pick of.
Are SFO to ONT flight tickets cheaper when they're purchased at the last minute?
Booking last minute from San Francisco Airport to Los Angeles - Ontario Intl. Airport (ONT) can be hit-or-miss. You may be able to score a bargain, but you could also miss out completely! If you'd rather start your travel planning early, Expedia compares flight deals up to 12 months in advance. Just bear in mind that not all airlines advertise their prices that far in advance. Our top tip? Check back often as updates are made frequently.

Explore a world of travel with Expedia

Ontario Airports

Los Angeles

San Francisco to Los Angeles Intl.
S$99.60

Burbank

San Francisco to Hollywood Burbank
S$227.80

Orange County

San Francisco to John Wayne
S$292.10
*Available to Expedia members.