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, TezJet have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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 day?

The number of flights available between San Francisco and Ontario is 6 per day as of November 2025. The most frequent departure time is 4:00PM, with 45% of daily flights leaving in the afternoon.

How often are flights from San Francisco to Ontario delayed?

Historically, on average around 13% 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.

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

As of November 2025, there are 46 flights per week flying from San Francisco to Ontario. The most common day of the week flights depart is Thu, with 17% of flights taking off on this day.

What airlines fly to Ontario?

Frontier, Alaska Airlines and Southwest are the top three most popular airlines that fly to Ontario from San Francisco according to our data. Frontier is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 11 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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.

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 6 operators available for flights from San Francisco Airport to Ontario Airport as of November 2025.

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.

$26 Cheap Flights from San Francisco to Ontario in 2025/26

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10:03 pm - 11:31 pmSFO-ONT

1h 28mnonstop

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$91Frontier

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Mon, Dec 15 - Mon, Dec 22

10:44 pm - 12:12 amSFO-ONT

1h 28mnonstop

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$92Frontier

Find Deal

Mon, Dec 22 - Fri, Dec 26

10:03 pm - 11:31 pmSFO-ONT

1h 28mnonstop

5:16 pm - 7:48 amONT-SFO

14h 32m1 stop

$94Frontier

Find Deal

Sun, Dec 14 - Sat, Dec 20

10:44 pm - 12:12 amSFO-ONT

1h 28mnonstop

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$95Frontier

Find Deal

Mon, Dec 22 - Fri, Dec 26

10:03 pm - 11:31 pmSFO-ONT

1h 28mnonstop

6:20 am - 12:28 amONT-SFO

18h 08m1 stop

$96Frontier

Find Deal

Sun, Dec 7 - Sun, Jan 25

10:20 pm - 11:48 pmSFO-ONT

1h 28mnonstop

7:15 am - 11:41 pmONT-SFO

16h 26m1 stop

$97Frontier

Find Deal

Fri, Dec 12 - Tue, Jan 27

6:30 am - 2:25 pmSFO-ONT

7h 55m1 stop

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$98Frontier

Find Deal

Fri, Dec 5 - Sun, Dec 7

10:03 pm - 11:31 pmSFO-ONT

1h 28mnonstop

6:20 am - 12:28 amONT-SFO

18h 08m1 stop

$100Frontier

Find Deal

Mon, Dec 8 - Sun, Jan 25

9:03 pm - 10:29 pmSFO-ONT

1h 26mnonstop

3:07 pm - 8:49 amONT-SFO

17h 42m1 stop

$101Frontier

Find Deal

Thu, Dec 11 - Tue, Jan 27

6:30 am - 2:25 pmSFO-ONT

7h 55m1 stop

10:12 pm - 11:52 pmONT-SFO

1h 40mnonstop

$102Frontier

Find Deal

Fri, Dec 5 - Mon, Dec 8

Frontier flights from San Francisco to Ontario

Our best Frontier deals on San Francisco to Ontario flight tickets

Frontier

Dec 22

SFO10:44 pmSan Francisco

1h 28m

ONT12:12 amOntario

Dec 26

ONT10:12 pmOntario

1h 40m

SFO11:52 pmSan Francisco

$92

Find similar

Frontier

Dec 14

SFO10:03 pmSan Francisco

1h 28m

ONT11:31 pmOntario

Dec 20

ONT5:16 pmOntario

14h 32m

1 stop

SFO7:48 amSan Francisco

$94

Find similar

Frontier

Dec 22

SFO10:44 pmSan Francisco

1h 28m

ONT12:12 amOntario

Dec 29

ONT10:12 pmOntario

1h 40m

SFO11:52 pmSan Francisco

$95

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United Airlines flights from San Francisco to Ontario

Our best United Airlines deals on San Francisco to Ontario flight tickets

United Airlines

Dec 9

SFO10:55 amSan Francisco

1h 22m

ONT12:17 pmOntario

Dec 15

ONT6:41 pmOntario

1h 24m

SFO8:05 pmSan Francisco

$107

Find similar

United Airlines

Dec 10

SFO9:28 pmSan Francisco

1h 21m

ONT10:49 pmOntario

Dec 17

ONT1:43 pmOntario

1h 24m

SFO3:07 pmSan Francisco

$137

Find similar

United Airlines

Dec 3

SFO9:28 pmSan Francisco

1h 21m

ONT10:49 pmOntario

Dec 7

ONT6:00 amOntario

1h 24m

SFO7:24 amSan Francisco

$173

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Route

Depart

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Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 12/15

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Mon 12/22

10:12 pm-11:52 pm

Nonstop1h 40m

$91

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 12/22

10:44 pm-12:12 am

Nonstop1h 28m

Ontario

Fri 12/26

10:12 pm-11:52 pm

Nonstop1h 40m

$92

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 12/14

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Sat 12/20

5:16 pm-7:48 am

1 stop14h 32m

$94

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 12/22

10:44 pm-12:12 am

Nonstop1h 28m

Ontario

Fri 12/26

10:12 pm-11:52 pm

Nonstop1h 40m

$95

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 12/7

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Sun 1/25

6:20 am-12:28 am

1 stop18h 08m

$96

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 12/12

10:20 pm-11:48 pm

Nonstop1h 28m

Ontario

Tue 1/27

7:15 am-11:41 pm

1 stop16h 26m

$97

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 12/5

6:30 am-2:25 pm

1 stop7h 55m

Ontario

Sun 12/7

10:12 pm-11:52 pm

Nonstop1h 40m

$98

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 12/8

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Sun 1/25

6:20 am-12:28 am

1 stop18h 08m

$100

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 12/11

9:03 pm-10:29 pm

Nonstop1h 26m

Ontario

Tue 1/27

3:07 pm-8:49 am

1 stop17h 42m

$101

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 12/5

6:30 am-2:25 pm

1 stop7h 55m

Ontario

Mon 12/8

10:12 pm-11:52 pm

Nonstop1h 40m

$102

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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, February 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 $105. If you aren’t able to travel during the month of February, then book flights to Ontario from San Francisco during January instead. Flights to Ontario in January, while not as cheap as those in February, still average around $117.

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 $124. 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 $117. 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 in the afternoon when prices are $197 on average. Flights to Ontario from San Francisco in the afternoon 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 $159 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 $100 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 November 2025, prices for San Francisco to Ontario flights are approximately 14% 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

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

Best Price Found	$74
Fastest flight time	1h 21m
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 $74. The best round-trip flight deal from San Francisco to Ontario found on momondo in the last 72 hours is $128.

The fastest flight from San Francisco to Ontario takes 1h 21m

Direct flights go from San Francisco to Ontario every day.

There is 1 airport near Ontario: Ontario (ONT)

Search flight deals

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 21m.
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 6 operators available for flights from San Francisco Airport to Ontario Airport as of November 2025.
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 Airbus A320neo, making up 15.70% of the total bookings. Other popular models include Boeing 737-800 with 15.02%, Embraer 175 with 14.68%, and Boeing 737 MAX 8 with 13.20%.
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 (51% of total bookings). The next most popular airlines are Frontier (47%), 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 5.8 3,103 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $48	Free Cancellation	Rating 6.3 8,158 reviews	Search Spirit Airlines flights
United Airlines	PriceFrom $58	Free Cancellation	Rating 7.4 9,029 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $59	Free Cancellation	Rating 8.0 11,326 reviews	Search Alaska Airlines flights
Delta	PriceFrom $108	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 11,047 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 19 flights on this route every week with an average price of $214. United Airlines is rated 7.4/10 by our users.
Frontier Flights From San Francisco to Ontario
$38 is the best Frontier flight deal from San Francisco to Ontario found on momondo over the last 72 hours. The average Frontier ticket price found was closer to $118, however, with flight time and availability significantly affecting the price. Frontier (5.8/10 from 3,103 user reviews) flies into Ontario from San Francisco 1 time in an average week so prices can vary.

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 $39

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 12/17. 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

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

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 November 2025, prices for San Francisco to Ontario flights are approximately 14% 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 13% 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, TezJet have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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

The number of flights available between San Francisco and Ontario is 6 per day as of November 2025. The most frequent departure time is 4:00PM, with 45% of daily flights leaving in the afternoon.

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

As of November 2025, there are 46 flights per week flying from San Francisco to Ontario. The most common day of the week flights depart is Thu, with 17% 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

Frontier 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