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

As of January 2026, there are 30 flights per week flying from San Francisco to Ontario. The most common day of the week flights depart is Wed, with 23% of flights taking off on this day.

How often are flights from San Francisco to Ontario delayed?

Historically, on average around 15% of flights between San Francisco and Ontario have experienced a delay on any given week. The average delay length over the past 12 months has been 121 minutes.

What is the cheapest airline that flies from San Francisco to Ontario?

United Airlines is the most popular carrier operating from San Francisco to Ontario

What airlines fly to Ontario?

Alaska Airlines, Frontier and Southwest are the top three most popular airlines that fly to Ontario from San Francisco according to our data. Alaska Airlines is the first choice among our users, with 27% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between San Francisco and Ontario is 4 per day as of January 2026. The most frequent departure time is 4:00PM, with 43% of daily flights leaving in the evening.

Which airline has the best punctuality record on San Francisco to Ontario flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

What is the most punctual flight time for San Francisco to Ontario flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

When did momondo last update prices for flights from San Francisco Airport to Ontario Airport?

Prices for flights from San Francisco Airport to Ontario Airport were last updated today.

How many operators does momondo search for flights from San Francisco Airport to Ontario Airport?

There are 5 operators available for flights from San Francisco Airport to Ontario Airport as of January 2026.

How old do you have to be to fly from San Francisco Airport to Ontario Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$33 Cheap Flights from San Francisco to Ontario in 2026

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8:43 am - 10:12 am

SFO

ONT

1h 29mnonstop

9:06 am - 10:48 am

ONT

SFO

1h 42mnonstop

$128Frontier

Fri, Mar 6 - Mon, Mar 9

7:20 am - 9:34 pm

SFO

ONT

14h 14m

1 stop

2:06 pm - 7:48 am

ONT

SFO

17h 42m

1 stop

$129Frontier

Wed, Feb 25 - Wed, Mar 4

8:48 am - 10:20 am

SFO

ONT

1h 32mnonstop

6:20 am - 12:23 am

ONT

SFO

18h 03m

1 stop

$134Frontier

Mon, Apr 6 - Sat, Apr 11

6:15 am - 11:59 pm

SFO

ONT

17h 44m

1 stop

6:00 am - 12:28 am

ONT

SFO

18h 28m

1 stop

$137Frontier

Sat, Feb 21 - Sat, Feb 28

8:53 am - 10:22 am

SFO

ONT

1h 29mnonstop

9:06 am - 10:48 am

ONT

SFO

1h 42mnonstop

$138Frontier

Mon, Mar 23 - Mon, Mar 30

7:15 pm - 1:11 pm

SFO

ONT

17h 56m

1 stop

9:06 am - 10:48 am

ONT

SFO

1h 42mnonstop

$140Frontier

Tue, Mar 3 - Fri, Mar 6

6:55 am - 9:34 pm

SFO

ONT

14h 39m

1 stop

7:17 pm - 7:48 am

ONT

SFO

12h 31m

1 stop

$141Frontier

Wed, Feb 11 - Wed, Feb 18

8:33 am - 10:05 am

SFO

ONT

1h 32mnonstop

8:49 am - 10:30 am

ONT

SFO

1h 41mnonstop

$142Frontier

Thu, Apr 2 - Mon, Apr 6

7:15 pm - 1:52 pm

SFO

ONT

18h 37m

1 stop

10:30 am - 2:23 pm

ONT

SFO

27h 53m

1 stop

$144Frontier

Tue, Feb 10 - Thu, Feb 12

6:55 am - 9:34 pm

SFO

ONT

14h 39m

1 stop

6:05 am - 12:28 am

ONT

SFO

18h 23m

1 stop

$145Frontier

Wed, Feb 18 - Thu, Feb 19

Frontier flights from San Francisco to Ontario

Our best Frontier deals on San Francisco to Ontario flight tickets

Frontier

Mar 6

SFO8:43 amSan Francisco

1h 29m

ONT10:12 amOntario

Mar 9

ONT9:06 amOntario

1h 42m

SFO10:48 amSan Francisco

$128

Frontier

Feb 25

SFO7:20 amSan Francisco

14h 14m

1 stop

ONT9:34 pmOntario

Mar 4

ONT2:06 pmOntario

17h 42m

1 stop

SFO7:48 amSan Francisco

$129

Frontier

Apr 6

SFO8:48 amSan Francisco

1h 32m

ONT10:20 amOntario

Apr 11

ONT6:20 amOntario

18h 03m

1 stop

SFO12:23 amSan Francisco

$134

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 3/6

8:43 am-10:12 am

Nonstop1h 29m

Ontario

Mon 3/9

9:06 am-10:48 am

Nonstop1h 42m

$128

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 2/25

7:20 am-9:34 pm

1 stop14h 14m

Ontario

Wed 3/4

2:06 pm-7:48 am

1 stop17h 42m

$129

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 4/6

8:48 am-10:20 am

Nonstop1h 32m

Ontario

Sat 4/11

6:20 am-12:23 am

1 stop18h 03m

$134

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 2/21

6:15 am-11:59 pm

1 stop17h 44m

Ontario

Sat 2/28

6:00 am-12:28 am

1 stop18h 28m

$137

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 3/23

8:53 am-10:22 am

Nonstop1h 29m

Ontario

Mon 3/30

9:06 am-10:48 am

Nonstop1h 42m

$138

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 3/3

7:15 pm-1:11 pm

1 stop17h 56m

Ontario

Fri 3/6

9:06 am-10:48 am

Nonstop1h 42m

$140

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 2/11

6:55 am-9:34 pm

1 stop14h 39m

Ontario

Wed 2/18

7:17 pm-7:48 am

1 stop12h 31m

$141

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 4/2

8:33 am-10:05 am

Nonstop1h 32m

Ontario

Mon 4/6

8:49 am-10:30 am

Nonstop1h 41m

$142

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 2/10

7:15 pm-1:52 pm

1 stop18h 37m

Ontario

Thu 2/12

10:30 am-2:23 pm

1 stop27h 53m

$144

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 2/18

6:55 am-9:34 pm

1 stop14h 39m

Ontario

Thu 2/19

6:05 am-12:28 am

1 stop18h 23m

$145

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How to get the cheapest flight ticket from San Francisco to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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Delays

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What is the cheapest month to fly to Ontario?

In general, May is the cheapest month to fly from San Francisco to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $117. If you aren’t able to travel during the month of May, then book flights to Ontario from San Francisco during February instead. Flights to Ontario in February, while not as cheap as those in May, still average around $137.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $136. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to Ontario for around $185.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from San Francisco to Ontario when you can find flight prices for as low as $131. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $277 on average. Flights to Ontario from San Francisco at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest San Francisco to Ontario flight route?

Fly from San Francisco to Ontario for the best San Francisco - Ontario flight prices

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

You are more likely to see cheaper flights to Ontario from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $170 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from San Francisco for as low as $113 on momondo.

What cabin class options are available on San Francisco to Ontario flights?

There are 4 cabin classes available to choose from on San Francisco to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have San Francisco to Ontario flight prices changed over time?

As of January 2026, prices for San Francisco to Ontario flights are approximately 18% more expensive when compared to flights at the same time last year.

When to book flights from San Francisco to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap San Francisco to Ontario (SFO to ONT) flight deals and tips

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Best Price Found	$107
Fastest flight time	1h 22m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from San Francisco in the past 72 hours is $107. The best round-trip flight deal from San Francisco to Ontario found on momondo in the last 72 hours is $180.

The fastest flight from San Francisco to Ontario takes 1h 22m

Direct flights go from San Francisco to Ontario every day.

There is 1 airport in Ontario. From San Francisco there are direct flights to Ontario (ONT).

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How far is San Francisco to Ontario by plane?
There are 370.2 mi between San Francisco and Ontario. By plane, this route typically takes 1h 22m.
When did momondo last update prices for flights from San Francisco Airport to Ontario Airport?
Prices for flights from San Francisco Airport to Ontario Airport were last updated today.
How many operators does momondo search for flights from San Francisco Airport to Ontario Airport?
There are 5 operators available for flights from San Francisco Airport to Ontario Airport as of January 2026.
How old do you have to be to fly from San Francisco Airport to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from San Francisco to Ontario?
Based on momondo bookings for flights between San Francisco and Ontario, the leading plane model is Boeing 737-800, making up 13.84% of the total bookings. Other popular models include Airbus A320-100/200 with 13.84%, Airbus A320neo with 12.85%, and Boeing 737 MAX 8 with 12.81%.
What is the most popular airline from San Francisco to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from San Francisco to Ontario is United Airlines (55% of total bookings). The next most popular airlines are Frontier (44%), American Airlines (1%), and Delta (1%).

Best airlines flying from San Francisco to Ontario

Compare and see reviews for airlines that fly from San Francisco to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $33	Free Cancellation	Rating 5.7 3,055 reviews	Search Frontier flights
United Airlines	PriceFrom $58	Free Cancellation	Rating 7.4 9,188 reviews	Search United Airlines flights
Delta	PriceFrom $97	Free Cancellation	Rating 7.9 8,087 reviews	Search Delta flights
Alaska Airlines	PriceFrom $107	Free Cancellation	Rating 8.0 11,768 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 11,169 reviews	Search American Airlines flights

United Airlines Flights From San Francisco to Ontario
The lowest priced United Airlines flight from San Francisco to Ontario from the last 72 hours was $58. Generally, United Airlines has 12 flights on this route every week with an average price of $211. United Airlines is rated 7.4/10 by our users.

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to Ontario?

It is quick and easy to find San Francisco to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.

Can I find flights from San Francisco to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from San Francisco on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from San Francisco to Ontario?

Once all potential San Francisco to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from San Francisco to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of San Francisco to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from San Francisco to Los Angeles from $65

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Los Angeles departing on 4/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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How to get the cheapest flight ticket from San Francisco to Ontario

What is the cheapest month to fly to Ontario?

What is the cheapest day to depart on your flight to Ontario?

What is the cheapest time of day to depart on your flight to Ontario?

What is the cheapest San Francisco to Ontario flight route?

Fly from San Francisco to Ontario for the best San Francisco - Ontario flight prices

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

What cabin class options are available on San Francisco to Ontario flights?

There are 4 cabin classes available to choose from on San Francisco to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have San Francisco to Ontario flight prices changed over time?

As of January 2026, prices for San Francisco to Ontario flights are approximately 18% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from San Francisco to Ontario?

United Airlines is the most popular carrier operating from San Francisco to Ontario

What airlines fly to Ontario?

How often are flights from San Francisco to Ontario delayed?

Historically, on average around 15% of flights between San Francisco and Ontario have experienced a delay on any given week. The average delay length over the past 12 months has been 121 minutes.

What is the most punctual flight time for San Francisco to Ontario flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on San Francisco to Ontario flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

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

The number of flights available between San Francisco and Ontario is 4 per day as of January 2026. The most frequent departure time is 4:00PM, with 43% of daily flights leaving in the evening.

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

As of January 2026, there are 30 flights per week flying from San Francisco to Ontario. The most common day of the week flights depart is Wed, with 23% of flights taking off on this day.

When to book flights from San Francisco to Ontario

Cheap San Francisco to Ontario (SFO to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to Ontario

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

How far is San Francisco to Ontario by plane?

When did momondo last update prices for flights from San Francisco Airport to Ontario Airport?

How many operators does momondo search for flights from San Francisco Airport to Ontario Airport?

How old do you have to be to fly from San Francisco Airport to Ontario Airport?

What documentation or ID do you need to fly to Ontario Airport?

What is the most popular plane model from San Francisco to Ontario?

What is the most popular airline from San Francisco to Ontario?

Best airlines flying from San Francisco to Ontario

Compare and see reviews for airlines that fly from San Francisco to Ontario with momondo

United Airlines Flights From San Francisco to Ontario

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to Ontario?

Can I find flights from San Francisco to Ontario with flexible booking policies on momondo?

How can momondo help me find flights from San Francisco to Ontario?

I’m not ready to book a flight from San Francisco to Ontario right now. Can momondo alert me if prices change?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California