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)

All the information you need to plan the best ONT to SFO flight in 2021: compare Ontario to San Francisco flight prices with the expected peak season, weather and rainfall in San Francisco.
ONT - SFO
Price
$148 - $289
SFO
Temperature
59 - 77 °F
SFO
Precipitation
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

Average price

$148

Average for round-trip flights in August 2021

Round-trip from

$148

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 23% versus a flight in the evening.

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

The best prices found for ONT to SFO flights for July, August
12 Aug - 16 Aug
$64pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
27 Aug - 30 Aug
$66pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
16 Aug - 20 Aug
$67pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Ontario to San Francisco 2021 flight deals

Cheap flights to San Francisco from Ontario found for this year
12 Aug - 16 Aug
$64pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
27 Aug - 30 Aug
$66pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
6 Sep - 13 Sep
$67pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Non-stop flights to San Francisco from Ontario

Save time with Ontario to San Francisco direct flight deals
12 Aug - 16 Aug
$64pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
27 Aug - 30 Aug
$66pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
6 Sep - 13 Sep
$67pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Last minute flights from Ontario to San Francisco

Late deals on round-trip flights to San Francisco from Ontario, departing today and this week
9 Aug - 12 Aug
$73pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
9 Aug - 5 Sep
$77pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
5 Aug - 9 Aug
$86pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Related info for your journey

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

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.

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.

What airports do I use to fly from Ontario to San Francisco?

To fly from Ontario to San Francisco, you need to book a flight from Ontario (ONT) to San Francisco (SFO). Nonstop flights to San Francisco from Ontario take 1h 18m on average. When it comes time to book airfare, you have a few options: there are 2 outbound flights from Ontario to San Francisco offered by 10 different airlines.

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 $64, but on average you can expect to pay $90.

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 $99.

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: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday.

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.
Early Morning (Midnight to 6am) - 50% of flight departures
Morning (6am - Noon) - 25% of flight departures
Afternoon (Noon - 6pm) - 25% of flight departures

Does it rain more in Ontario or San Francisco?

In Ontario, there will be same rainfall in Ontario compared to San Francisco over the next 1 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 fly from Ontario to San Francisco in about 1h 24m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 364 mi. Most flights are nonstop.

What is the cheapest airline to fly from Ontario to San Francisco round-trip?

Cheapflights users have booked flights from Ontario to San Francisco round-trip from $64. Users have found that Frontier is 67% cheaper than the other options available to this destination.

COVID Restrictions

View COVID Travel Restrictions for San Francisco, CA

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

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

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

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.

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

Returning to Ontario from San Francisco

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.

Hide COVID Travel Restrictions for San Francisco, CA

Alternative routes for Ontario to San Francisco

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

Destination information for San Francisco

Things to know before you go - useful duration and weather info for your trip from Ontario to San Francisco.
Flight duration
1h 26m
Average temperature for August in San Francisco
73.4 °F

Airports servicing Ontario

Airports servicing San Francisco

Top 9 airlines flying from Ontario to San Francisco

The chart below displays the airlines Cheapflights users traveling from Ontario to San Francisco 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
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

See what time of day planes typically take off from Ontario towards San Francisco.
Morning 6 AM to noon 35% of ONT to SFO departures
Early morning Midnight to 6 AM 33% of ONT to SFO departures
Afternoon Noon to 6 PM 32% 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
See how many times per day planes take to the skies headed from Ontario to San Francisco.
Sunday
0 flights
Monday
0 flights
Tuesday
0 flights
Wednesday
3 daily flights
Thursday
3 daily flights
Friday
6 daily flights
Saturday
6 daily flights
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