Cheap flights from San Francisco to Ontario (SFO - ONT) from $19
This is the cheapest one-way flight price, found on 9/27. Prices may vary by date and flight preferences.
The best prices from San Francisco to Ontario are usually found in September or May, booked 25 days in advance, depart on a Saturday or Thursday and return on a Friday
How to find the cheapest flight from San Francisco (SFO) to Ontario (ONT)
All the information you need to plan the best SFO to ONT flight in 2023: compare San Francisco to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
Popular in | June |
|---|---|
Cheapest in | September |
Round-trip from | $217 |
One-way from | $19 |
SFO - LAX Price | $217 - $494 |
|---|---|
LAX Temperature | 57.2 - 73.4 °F |
LAX Rainfall | 0 - 3.4 inches |
What is the cheapest day to fly round-trip from San Francisco to Ontario?
Tuesday flights are generally found to be more expensive for flights from San Francisco to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.
How far in advance should I book a flight from San Francisco to Ontario?
Find a great deal and save up to 48% by booking at least 60 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from San Francisco to Ontario within the next two weeks, with the cheapest ticket starting at $157.
What is the cheapest month to fly from San Francisco to Ontario?
Flights from San Francisco to Ontario lean towards being more expensive in November. Prices are generally better when you fly from San Francisco to Ontario in January, with the cheapest ticket starting at $88.
When is the cheapest time to fly from San Francisco to Ontario (SFO - ONT)?
Unlike at noon, when flights are generally more expensive, you can save up to 39% on flights from San Francisco to Ontario by exploring options for tickets in the afternoon.
Cheap Frontier flights from San Francisco to Ontario
Find some of the cheapest Frontier flights traveling from San Francisco to Ontario. Make sure to double check the flight details before booking.
Cheap American Airlines flights from San Francisco to Ontario
Some of the best deals we've found on American Airlines flights traveling from San Francisco to Ontario. Deals are refreshing constantly so come back soon for more options.
Cheap San Francisco to Ontario flights in September & October 2023
The best prices found for SFO to ONT flights for September, October
These are some of the best deals we've found on flights to Ontario in 2023 at this time. For more flight deals, be sure to check back very soon.
San Francisco to Ontario 2023 flight deals
Cheap flights to Ontario from San Francisco found for this year
These are some of the best deals we've found on flights to Ontario in 2023 at this time. For more flight deals, be sure to check back very soon.
Non-stop flights to Ontario from San Francisco
Save time with San Francisco to Ontario direct flight deals
For a quicker trip, book one of these direct flights from San Francisco to Ontario. Users seeking other options on flights from San Francisco to Ontario should update the search form at the top of the page.
San Francisco to Ontario flights leaving soon
Late deals on return flights to Ontario from San Francisco, departing today and this week
Have a look at some of the last-minute flights available departing from San Francisco to Ontario. Users should examine the flight details to ensure there are no surprises.
One-way flights to Ontario from San Francisco
The cheapest one-way flights from San Francisco to Ontario
Users traveling one-way from San Francisco to Ontario can select one of these great deals. Users needing a return flight from San Francisco to Ontario should utilize the search form above.
Find flights from San Francisco to Ontario within your budget
Use the slider to find flights from San Francisco to Ontario that fit your budget.
Fly from
Fly to
Budget
$38 - $177
Route
Depart
Return
Price
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 10/28
Nonstop1h 26m
Ontario
Mon 10/30
Nonstop1h 29m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 11/8
Nonstop1h 27m
Ontario
Wed 11/15
Nonstop1h 32m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 12/2
Nonstop1h 26m
Ontario
Mon 12/4
Nonstop1h 34m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 11/1
Nonstop1h 26m
Ontario
Tue 11/7
Nonstop1h 32m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Mon 10/30
Nonstop1h 25m
Ontario
Wed 11/1
Nonstop1h 32m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 11/8
Nonstop1h 27m
Ontario
Fri 11/10
Nonstop1h 32m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 10/28
Nonstop1h 26m
Ontario
Sun 11/5
Nonstop1h 32m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Fri 10/27
1 stop4h 35m
Ontario
Sat 10/28
1 stop4h 26m
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 10/28
1 stop4h 10m
Ontario
Thu 11/2
2 stops5h 45m
Reviews of airlines servicing Ontario
Get a feel of what it's like to fly with Frontier, American Airlines and United Airlines from San Francisco to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Comfort
Entertainment
Overall
Crew
Food
Boarding
Reviews
We were rebooked from our original 7 am flight to a 9:25 am flight. We tried but could not get seat assignments upon online check-in. At the airport, the security officer almost did not let us through to the gate, since our boarding pass had no QR code and said "seat assignment at the gate." When we made it to the gate and asked for seat assignments, the gate agents kept telling us that they were not authorized to assign us seats and that we would be assigned seats 30 mins prior to departure. They referred us to the service center that would not help either. Since they also said that the flight was full, we were left in doubt if we were going to make it onto this flight. Finally, after everybody else's seats had been assigned, about 15 mins to departure they assigned us two separate seats. We could not sit together. Whoever designed seat assignment and boarding procedures at Alaska Airlines must have zero understanding of how to make such a process work smoothly and efficiently. We'll think twice before booking another flight with Alaska!
Related info for your journey
Useful info, stats and facts about San Francisco to Ontario flights.
What airports do I use to fly from San Francisco to Ontario?
Ontario is the airport most travelers will use when flying to Ontario from San Francisco. Booking flights from San Francisco (SFO) to Ontario (ONT) should be relatively easy as there are 5 daily flights to Ontario from 7 different airlines. 1h 18m is how long a flight from San Francisco to Ontario will take if you book a nonstop flight.
Can I find flights from San Francisco to Ontario for under $100 on Cheapflights?
Yes, there are multiple flights from San Francisco to Ontario for under $100. The cheapest flight booked recently is on Frontier for just $38, but on average you can expect to pay $57.
Are there nonstop flights from San Francisco to Ontario for under $100 on Cheapflights?
Cheapflights has at least 20 direct flights from San Francisco to Ontario under $100. A good price for a nonstop flight from San Francisco to Ontario is less than $57.
Are there last-minute flights available from San Francisco to Ontario for under $100?
There are currently 20+ open flights from San Francisco to Ontario within the next 7 days for less than $100.
What days are nonstop flights available from San Francisco to Ontario?
Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.
How popular is this San Francisco to Ontario flight route?
Within the past month, 11 users have taken a look at flights from San Francisco to Ontario.
How many flights depart from San Francisco to Ontario on average per day?
Per day, 15 flights depart from San Francisco to Ontario on average.
Morning (6am - Noon) - 20% of flight departures
Afternoon (Noon - 6pm) - 20% of flight departures
Evening (6pm - Midnight) - 60% of flight departures
How long is the flight from San Francisco to Ontario?
A quick flight from San Francisco to Ontario can take about 1h 26m. Frontier provides one of the quickest options available for as low as $38. San Francisco and Ontario are separated by a distance of 364 mi. All flights are typically nonstop.
What is the cheapest airline to fly from San Francisco to Ontario round-trip?
Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $38. You may be able to fly from San Francisco to Ontario for 76% less than the average price by searching for this airline.
What are the most popular airlines that fly from San Francisco to Ontario?
Before booking your flight from San Francisco to Ontario check out the most popular airlines for this route: Alaska Airlines, JetBlue or Delta.
What are the most reliable airlines from San Francisco to Ontario?
No one likes to see their flight delayed. When booking a flight from San Francisco to Ontario consider choosing SkyWest Airlines (94%), United Airlines (93%) or Air Canada (93%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from San Francisco to Ontario?
On average you can expect to pay $245 for a flight from San Francisco to Ontario. The cheapest flight overall is $23 while the most popular route, (San Francisco - Ontario) is currently priced at $46.
What does SFO to ONT mean?
SFO stands for San Francisco Airport, while ONT stands for Ontario Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.
Other flights from San Francisco
Flights to Ontario from San Francisco
Alternative routes for San Francisco to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from San Francisco to Ontario
The chart below displays the airlines Cheapflights users traveling from San Francisco to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Hourly flight availability from San Francisco to Ontario
See what time of day planes typically take off from San Francisco to Ontario
| 1%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 15%of flight departures | Morning6 am to noon |
| 53%of flight departures | AfternoonNoon to 6 pm |
| 31%of flight departures | Evening6 pm to midnight |
Weekly flight availability from San Francisco to Ontario
See how many times per day planes take to the skies headed from San Francisco to Ontario
| Sunday | 4daily flights |
|---|---|
| Monday | 6daily flights |
| Tuesday | 6daily flights |
| Wednesday | 6daily flights |
| Thursday | 6daily flights |
| Friday | 6daily flights |
| Saturday | 2daily flights |
Fly with Cheapflights
What makes Cheapflights the go-to destination for all your flight needs
How does Cheapflights help users find flights from San Francisco to Ontario?
Deals for San Francisco to Ontario flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from San Francisco to Ontario?
Millions of users choose and trust Cheapflights to book the best flight deals from San Francisco to Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from San Francisco to Ontario with no change fees?
Yes, we can. To see specific flights from San Francisco to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.
Can Cheapflights notify me if prices for flights from San Francisco to Ontario become cheaper?
Yes, Cheapflights has a feature called Price Alert, which essentially offers users the ability to be notified when flight prices change. Track prices for your flight to Ontario from San Francisco today and book when you’re ready!