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

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The best prices from Ontario to San Francisco are usually found in August or April, booked 35 days in advance, depart on a Saturday or Friday and return on a Tuesday

How to find the cheapest flight from
Ontario (ONT) to San Francisco (SFO)

ONT - SFO
Price
$148 - $289
SFO
Temperature
59 - 77 °F
SFO
Rainfall
0 - 4.7 inches

Popular in

November

High demand for flights, 33% potential price rise

Cheapest in

August

Best time to find cheap flights, 24% potential price drop

Round-trip from

$148

From Ontario to San Francisco

One-way from

$19

One-way flight from Ontario to San Francisco

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 Ontario to San Francisco?

Flying to your destination on a Sunday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to San Francisco. Check prices with Cheapflights to find a great deal for your trip.

How far in advance should I book a flight from Ontario to San Francisco?

Travelers have found it’s best to book a flight 35 days in advance to save up to 7% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 35 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Ontario to San Francisco 1-2 weeks in advance for as low as $99, or $105 for flights within the next 24 hours.

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

The best pricing can be found in the month of August. Prices to San Francisco from Ontario average $108. You can even find prices in August for less than $108, as users have found deals to San Francisco from as low as $48. The month of June appears to be one of the more expensive times to travel to San Francisco from Ontario. Flying in the targeted month can save you up to 17%.

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

When flying from Ontario to San Francisco, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 29% versus a flight in the evening.

Cheap flights from Ontario to San Francisco in March, April 2021

18 Mar - 21 Mar
$81pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
16 Mar - 24 Mar
$82pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
 
1 STOP
ONT
Ontario
8 Apr - 11 Apr
$87pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Ontario to San Francisco 2021 flight deals

18 Mar - 21 Mar
$81pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
16 Mar - 24 Mar
$82pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
 
1 STOP
ONT
Ontario
8 Apr - 11 Apr
$87pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Non-stop flights to San Francisco from Ontario

18 Mar - 21 Mar
$81pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
23 Mar - 23 Mar
$92pp
ONT
Ontario
United Airlines
Non-Stop
SFO
San Francisco
SFO
San Francisco
United Airlines
Non-Stop
ONT
Ontario
25 Mar - 1 Apr
$93pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Last minute flights from Ontario to San Francisco

18 Mar - 21 Mar
$81pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
16 Mar - 24 Mar
$82pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
 
1 STOP
ONT
Ontario
16 Mar - 23 Mar
$93pp
ONT
Ontario
Frontier
 
1 STOP
SFO
San Francisco
SFO
San Francisco
Frontier
 
1 STOP
ONT
Ontario

One-way flights to San Francisco from Ontario

1:55 pm - 3:22 pm
Frontier
Nonstop
1h 27m
ONT - SFO
Frontier
$19
FlightNetwork
8:11 am - 9:33 am
Frontier
Nonstop
1h 22m
ONT - SFO
Frontier
$28
mytrip.com
8:11 am - 9:33 am
Frontier
Nonstop
1h 22m
ONT - SFO
Frontier
$41
FlightNetwork

Related info for your journey

Flight FAQs

From Ontario to San Francisco

Are flight prices decreasing from Ontario to San Francisco 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 Ontario and San Francisco 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.

What safety measures are being taken by airlines flying from Ontario to San Francisco to control the spread of COVID-19?

Airlines globally have implemented additional safety measures to accommodate you. Alaska Airlines and Delta are some airlines that have done so. Some of the new policies that have been implemented to accommodate travelers flying from Ontario to San Francisco are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

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

Due to the rapidly changing circumstances due to COVID-19, airlines like United Airlines, American Airlines, and Alaska Airlines flying from Ontario to San Francisco have implemented new flexible cancellation policies.

Can I find flights from Ontario to San Francisco for under $100 on Cheapflights?

Yes, there are multiple flights from Ontario to San Francisco for under $100. The cheapest flight booked recently is on Frontier for just $37, but on average you can expect to pay $94.

Are there nonstop flights from Ontario to San Francisco for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from Ontario to San Francisco under $100. A good price for a nonstop flight from Ontario to San Francisco is less than $137.

Are there last-minute flights available from Ontario to San Francisco for under $100?

There are currently 20+ open flights from Ontario to San Francisco within the next 7 days for less than $100.

What days are nonstop flights available from Ontario to San Francisco?

Nonstop flights are available for this route on the following days: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

How popular is this flight route?

This flight path from Ontario to San Francisco was viewed by 880 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

How many flights depart from Ontario to San Francisco on average per day?

4 flight departures from Ontario to San Francisco per day on average.
Morning (6am - Noon) - 50% of flight departures
Afternoon (Noon - 6pm) - 50% of flight departures

Does it rain more in Ontario or San Francisco?

In Ontario, there will be less rainfall in Ontario compared to San Francisco over the next 8 days.

Is Ontario weather warmer or cooler than San Francisco?

We forecast the temperature to be around the 95 °F's in July, on average. The temperature in San Francisco is generally colder than in Ontario. Book flights in a timely manner in correlation to your departure date.

How long is the flight from Ontario to San Francisco?

Airlines like Frontier, United Airlines, and American Airlines fly from Ontario to San Francisco in about 1h 22m. The time it takes to get you to your destination can typically vary by up to 2h 53m. Airlines will cover a distance of 364 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Cheapflights users have booked flights from Ontario to San Francisco round-trip from $37. Another airline that can offer you cheap pricing is United Airlines. Users have found that Frontier is 80% cheaper than the other options available to this destination.

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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $19. Frontier is not the only option available. At the moment, Alaska Airlines is another option, for $92.

Alternative routes for Ontario to San Francisco

Destination information for San Francisco

Flight duration
1h 24m
Average temperature for March in San Francisco
66.2 °F
Avg rainfall for March in San Francisco
1.6 ″

Airports servicing Ontario

Airports servicing San Francisco

Top 9 airlines flying from Ontario to San Francisco

Airline Cheapest Average Flexibility On-time COVID-19 safety
Delta
$52 $119 No cancel fee N/A
Alaska Airlines
$48 $139 No cancel fee 75%
Spirit Airlines
$91 $142 No cancel fee 65%
Southwest
$154 $200 No cancel fee 63%
JetBlue
$49 $218 No cancel fee 62%
United Airlines
$97 $223 No cancel fee 69%
American Airlines
$71 $224 No cancel fee 71%
JSX
$208 $313 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
$3,843 $6,801 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 Ontario to San Francisco

Afternoon Noon to 6 PM 40% of ONT to SFO departures
Morning 6 AM to noon 33% of ONT to SFO departures
Early morning Midnight to 6 AM 27% of ONT to SFO departures
Evening 6 PM to midnight 0% of ONT to SFO departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Ontario to San Francisco
Sunday
5 daily flights
Monday
6 daily flights
Tuesday
2 daily flights
Wednesday
2 daily flights
Thursday
5 daily flights
Friday
6 daily flights
Saturday
4 daily flights
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