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

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The best prices from San Francisco to Ontario are usually found in August or April, booked 26 days in advance, depart on a Tuesday or Thursday and return on a Saturday

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 2021: compare San Francisco to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
SFO - ONT
Price
$166 - $292

Popular in

November

High demand for flights, 23% potential price rise

Cheapest in

August

Best time to find cheap flights, 26% potential price drop

Round-trip from

$166

From San Francisco to Ontario

One-way from

$79

One-way flight from San Francisco to Ontario

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from San Francisco to Ontario?

Saturday flights are found to be more expensive to fly 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 20% by booking at least 17 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 $75.

What is the cheapest month to fly from San Francisco to Ontario?

April is one of the best times of the year to fly to Ontario from San Francisco. Prices for April average $86 per person but you can even find prices for as low as $43. The most expensive prices can be found in the month of December. Opting for a April flight can save you 23% on your journey compared to booking in April

When is the cheapest time to fly from San Francisco to Ontario (SFO - ONT)?

One of the essential ways to save on airfare from San Francisco to Ontario is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 27% on airfare.

Cheap flights from San Francisco to Ontario in August, September 2021

The best prices found for SFO to ONT flights for August, September
27 Aug - 5 Sep
$64pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
20 Aug - 23 Aug
$68pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
20 Aug - 22 Aug
$69pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco

San Francisco to Ontario 2021 flight deals

Cheap flights to Ontario from San Francisco found for this year
27 Aug - 5 Sep
$64pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
20 Aug - 23 Aug
$68pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
20 Aug - 22 Aug
$69pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco

Non-stop flights to Ontario from San Francisco

Save time with San Francisco to Ontario direct flight deals
26 Aug - 29 Aug
$64pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
10 Sep - 13 Sep
$66pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
20 Aug - 22 Aug
$68pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco

Last minute flights from San Francisco to Ontario

Late deals on round-trip flights to Ontario from San Francisco, departing today and this week
9 Aug - 12 Aug
$64pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
12 Aug - 16 Aug
$68pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
9 Aug - 15 Aug
$92pp
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco

One-way flights to Ontario from San Francisco

The cheapest one-way flights from San Francisco to Ontario
2:50 pm - 4:10 pm
United Airlines
Nonstop
1h 20m
SFO - ONT
United Airlines
$79
United
6:45 am - 1:01 pm
American Airlines
1 Stop
6h 16m
SFO - ONT
American Airlines
1:40 pm - 6:18 pm
Frontier
1 Stop
4h 38m
SFO - ONT
Frontier
$96
Kiwi.com

Related info for your journey

Useful info, stats and facts about <span class="emphasized">San Francisco</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From San Francisco to Ontario

Are flight prices decreasing from San Francisco to Ontario due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both San Francisco and Ontario for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Which airlines flying from San Francisco to Ontario have flexible cancellations due to COVID-19?

Some of our airline partners flying from San Francisco to Ontario have new flexible policies in place due to COVID-19. United Airlines, American Airlines, and Alaska Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like United Airlines with this kind of flexibility.

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 10 different airlines. 1h 17m 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 $64, but on average you can expect to pay $97.

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 $109.

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?

Days when nonstop flights are available for this flight are: Monday, Wednesday, Thursday, Friday, Saturday.

How popular is this flight route?

Flights from San Francisco to Ontario have been viewed 791 times in the past calendar month.

Does it rain more in San Francisco or Ontario?

Expected rainfall in San Francisco is same as in Ontario. You can expect this to be the case over the next 3 days.

Is San Francisco weather warmer or cooler than Ontario?

You can imagine temperatures to be in the 95 °F range in July. The weather in Ontario is generally hotter than San Francisco's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.

How long is the flight from San Francisco to Ontario?

Departing from San Francisco to Ontario will take you 1h 19m. Generally, flights for this route are nonstop.

What are the cheapest airlines flying from San Francisco to Ontario round-trip?

Frontier, at $64, was found to be the cheapest airline from San Francisco to Ontario. An alternate airline flying to your destination would be United Airlines. Frontier is currently priced 71% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from San Francisco to Ontario one-way?

The cheapest airlines for a one-way flight from San Francisco to Ontario are Frontier ($30), United Airlines ($59), and American Airlines ($76).

COVID Restrictions

View COVID Travel Restrictions for Ontario, CA

Do I need a COVID test to fly to Ontario from San Francisco?

Information is based on travel restrictions for travel to Ontario within the United States

Most visitors from San Francisco need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from San Francisco must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Ontario.

Quarantine requirements
Visitors from San Francisco are not required to quarantine after entering Ontario.

Do I need a test to fly back to San Francisco from Ontario?

Returning to San Francisco from Ontario

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to San Francisco.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering San Francisco.

Hide COVID Travel Restrictions for Ontario, CA

Alternative routes for San Francisco to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from San Francisco to Ontario.
Flight duration
1h 25m

Airports servicing San Francisco

Airports servicing Ontario

Top 9 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.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Spirit Airlines
$89 $153 No cancel fee 65%
Delta
$56 $154 No cancel fee N/A
Alaska Airlines
$76 $201 No cancel fee 75%
Southwest
$152 $223 No cancel fee 63%
JetBlue
$75 $232 No cancel fee 62%
United Airlines
$107 $253 No cancel fee 69%
American Airlines
$112 $270 No cancel fee 71%
JSX
$147 $316 No cancel fee N/A

We couldn't confirm the COVID-19 safety measures taken by JSX. Please check directly on their website for additional information.

Linear Air Taxi
$1,880 $5,192 No cancel fee N/A

We couldn't confirm the COVID-19 safety measures taken by Linear Air Taxi. Please check directly on their website for additional information.

Hourly flight availability from San Francisco to Ontario

See what time of day planes typically take off from San Francisco towards Ontario.
Afternoon Noon to 6 PM 72% of SFO to ONT departures
Morning 6 AM to noon 27% of SFO to ONT departures
Early morning Midnight to 6 AM 1% of SFO to ONT departures
Evening 6 PM to midnight 0% of SFO to ONT departures
Midnight
6 AM
Noon
6 PM
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
4 daily flights
Monday
7 daily flights
Tuesday
6 daily flights
Wednesday
6 daily flights
Thursday
6 daily flights
Friday
4 daily flights
Saturday
4 daily flights
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