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. Thursday has historically seen more delays on average compared to the rest of the week.

How often are flights from San Francisco to Ontario delayed?

Historically, on average around 14% 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 122 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.

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 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 38% of daily flights leaving in the afternoon.

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

United Airlines and Southwest are the most popular carriers operating from San Francisco to Ontario

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 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 28% 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.

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.

$32 Cheap Flights from San Francisco to Ontario in 2026

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8:43 am - 10:12 am

SFO

ONT

1h 29mnonstop

4:49 pm - 9:19 pm

ONT

SFO

4h 30m1 stop

$104Frontier

Mon, Mar 9 - Wed, Mar 11

10:03 pm - 11:31 pm

SFO

ONT

1h 28mnonstop

10:12 pm - 11:52 pm

ONT

SFO

1h 40mnonstop

$105Frontier

Fri, Apr 3 - Mon, Apr 6

7:15 pm - 9:34 am

SFO

ONT

14h 19m2 stops

9:06 am - 10:48 am

ONT

SFO

1h 42mnonstop

$122Frontier

Wed, Feb 18 - Mon, Mar 9

8:43 am - 4:58 pm

SFO

ONT

8h 15m1 stop

10:12 pm - 11:52 pm

ONT

SFO

1h 40mnonstop

$124Frontier

Mon, Apr 13 - Mon, Apr 13

8:53 am - 10:22 am

SFO

ONT

1h 29mnonstop

4:49 pm - 9:19 pm

ONT

SFO

4h 30m1 stop

$125Frontier

Mon, Mar 9 - Tue, Mar 10

8:43 am - 1:11 pm

SFO

ONT

4h 28m1 stop

9:06 am - 10:48 am

ONT

SFO

1h 42mnonstop

$127Frontier

Thu, Mar 5 - Fri, Mar 6

7:00 am - 3:07 pm

SFO

ONT

8h 07m1 stop

8:36 am - 10:01 pm

ONT

SFO

13h 25m1 stop

$128Frontier

Tue, Feb 3 - Tue, Feb 10

4:46 pm - 1:53 pm

SFO

ONT

21h 07m1 stop

7:15 am - 11:41 pm

ONT

SFO

16h 26m1 stop

$129Frontier

Sat, Jan 31 - Tue, Feb 3

9:32 pm - 12:10 pm

SFO

ONT

14h 38m1 stop

11:04 am - 7:28 pm

ONT

SFO

8h 24m1 stop

$131Frontier

Sun, Feb 1 - Thu, Feb 5

6:15 am - 12:20 am

SFO

ONT

18h 05m1 stop

11:04 am - 7:28 pm

ONT

SFO

8h 24m1 stop

$132Frontier

Sun, Jan 25 - Thu, Jan 29

Frontier flights from San Francisco to Ontario

Our best Frontier deals on San Francisco to Ontario flight tickets

Frontier

Mar 9

SFO8:43 amSan Francisco

1h 29m

ONT10:12 amOntario

Mar 11

ONT4:49 pmOntario

4h 30m

1 stop

SFO9:19 pmSan Francisco

$104

Frontier

Apr 3

SFO10:03 pmSan Francisco

1h 28m

ONT11:31 pmOntario

Apr 6

ONT10:12 pmOntario

1h 40m

SFO11:52 pmSan Francisco

$105

Frontier

Feb 18

SFO7:15 pmSan Francisco

14h 19m

2 stops

ONT9:34 amOntario

Mar 9

ONT9:06 amOntario

1h 42m

SFO10:48 amSan Francisco

$122

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 3/9

8:43 am-10:12 am

Nonstop1h 29m

Ontario

Wed 3/11

4:49 pm-9:19 pm

1 stop4h 30m

$104

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 4/3

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Mon 4/6

10:12 pm-11:52 pm

Nonstop1h 40m

$105

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 2/18

7:15 pm-9:34 am

2 stops14h 19m

Ontario

Mon 3/9

9:06 am-10:48 am

Nonstop1h 42m

$122

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 4/13

8:43 am-4:58 pm

1 stop8h 15m

Ontario

Mon 4/13

10:12 pm-11:52 pm

Nonstop1h 40m

$124

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 3/9

8:53 am-10:22 am

Nonstop1h 29m

Ontario

Tue 3/10

4:49 pm-9:19 pm

1 stop4h 30m

$125

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 3/5

8:43 am-1:11 pm

1 stop4h 28m

Ontario

Fri 3/6

9:06 am-10:48 am

Nonstop1h 42m

$127

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 2/3

7:00 am-3:07 pm

1 stop8h 07m

Ontario

Tue 2/10

8:36 am-10:01 pm

1 stop13h 25m

$128

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 1/31

4:46 pm-1:53 pm

1 stop21h 07m

Ontario

Tue 2/3

7:15 am-11:41 pm

1 stop16h 26m

$129

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 2/1

9:32 pm-12:10 pm

1 stop14h 38m

Ontario

Thu 2/5

11:04 am-7:28 pm

1 stop8h 24m

$131

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 1/25

6:15 am-12:20 am

1 stop18h 05m

Ontario

Thu 1/29

11:04 am-7:28 pm

1 stop8h 24m

$132

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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

Prices

Airlines

Delays

Other information

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 $119.

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 $131. 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 $181.

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 $126. 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 $167 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 4% 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	$84
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 $84. The best round-trip flight deal from San Francisco to Ontario found on momondo in the last 72 hours is $165.

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 14.84% of the total bookings. Other popular models include Boeing 737 MAX 8 with 14.46%, Airbus A320-100/200 with 13.55%, and Airbus A320neo with 12.92%.
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 (54% of total bookings). The next most popular airlines are Frontier (44%), Delta (1%), and American Airlines (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 $38	Free Cancellation	Rating 5.7 3,061 reviews	Search Frontier flights
United Airlines	PriceFrom $59	Free Cancellation	Rating 7.4 9,142 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $59	Free Cancellation	Rating 8.0 11,671 reviews	Search Alaska Airlines flights
Delta	PriceFrom $97	Free Cancellation	Rating 7.9 8,030 reviews	Search Delta flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 11,097 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 $59. Generally, United Airlines has 11 flights on this route every week with an average price of $214. 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 $59

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 3/10. 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 4% 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 and Southwest are the most popular carriers 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 14% 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 122 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. Thursday 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 38% of daily flights leaving in the afternoon.

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