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$33+ Cheap flights from San Francisco to Ontario (SFO - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Find cheap flights from San Francisco to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from San Francisco to Ontario are usually found in August or September, booked 70 days in advance, depart on a Monday or Wednesday and return on a Friday

Cheap flight deals from San Francisco to Ontario

Cheapest flights from San Francisco to Ontario
Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 27, 2026.

This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1412:31 pm
SFO
-
ONT
Nonstop1h 29m
Frontier
Mon 9/2811:38 am
ONT
-
SFO
Nonstop1h 34m
Frontier
Deal found 7/24$57
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:02 pm
SFO
-
ONT
Nonstop1h 34m
Frontier
Mon 9/1412:07 pm
ONT
-
SFO
Nonstop1h 36m
Frontier
Deal found 7/26$58
This Super.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm
SFO
-
ONT
Nonstop1h 34m
Frontier
Mon 9/1412:07 pm
ONT
-
SFO
Nonstop1h 36m
Frontier
Deal found 7/24$59
This Trip.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:33 pm
SFO
-
ONT
Nonstop1h 30m
Frontier
Fri 9/1111:38 am
ONT
-
SFO
Nonstop1h 34m
Frontier
Deal found 7/22$60
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/23$62
This Frontier deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Wed 8/263:13 pm
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/23$66
This Booking.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/179:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/26$69
This Super.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Mon 8/248:48 am
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/23$71
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:31 pm
SFO
-
ONT
Nonstop1h 29m
Frontier
Thu 10/82:26 pm
ONT
-
SFO
Nonstop1h 30m
Frontier
Deal found 7/24$73
This Mytrip deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Sat 8/228:48 am
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/26$74
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/59:33 am
SFO
-
ONT
Nonstop1h 29m
Frontier
Mon 9/78:48 am
ONT
-
SFO
Nonstop1h 27m
Frontier
Deal found 7/24$75

Find flight deals from San Francisco to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$57
(Frontier)

One-way from

$33
(Super.com)

Popular in

February

Cheapest in

August

Average price

$206

Good round-trip deal

$137 or less

Good one-way deal

$110 or less
Provider with most accurate pricing for San Francisco-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Ontario flights.
Search Deals
From San Francisco to Ontario
Search Deals
One-way flight from San Francisco to Ontario
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from San Francisco to Ontario.
Search Deals
Price to beat on a one-way flight from San Francisco to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 27, 2026.
Use the filters below to find and compare flights from San Francisco to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 8/20

5:10 am-11:25 am

1 stop6h 15m

Ontario

Mon 8/24

5:15 am-10:10 am

1 stop4h 55m

$151

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 8/15

6:10 am-3:15 pm

1 stop9h 05m

Ontario

Sat 8/22

2:55 pm-6:20 pm

1 stop3h 25m

$156

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 9/10

5:10 am-11:25 am

1 stop6h 15m

Ontario

Thu 9/10

4:50 pm-11:10 pm

1 stop6h 20m

$157

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 10/13

6:55 am-3:35 pm

2 stops8h 40m

Ontario

Thu 10/15

5:20 am-11:20 am

2 stops6h 00m

$161

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 8/15

6:10 am-3:15 pm

1 stop9h 05m

Ontario

Mon 8/17

5:45 pm-11:25 pm

1 stop5h 40m

$162

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 8/24

2:50 pm-10:05 pm

2 stops7h 15m

Ontario

Mon 8/31

2:40 pm-9:40 pm

2 stops7h 00m

$167
Quickest round-trip

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 9/2

6:30 pm-8:01 pm

Nonstop1h 31m

Ontario

Thu 9/10

6:08 am-7:35 am

Nonstop1h 27m

$187

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 9/17

9:17 pm-10:51 pm

Nonstop1h 34m

Ontario

Sat 9/19

1:56 pm-3:25 pm

Nonstop1h 29m

$187

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 8/31

6:30 pm-8:01 pm

Nonstop1h 31m

Ontario

Wed 9/16

9:01 am-10:30 am

Nonstop1h 29m

$187

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 9/10

10:37 am-12:12 pm

Nonstop1h 35m

Ontario

Mon 9/14

6:08 am-7:35 am

Nonstop1h 27m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Compare providers for flights from San Francisco to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Francisco to Ontario in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Super.comPrice Accuracy-Trust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Francisco-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Francisco to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San Francisco with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to Ontario

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

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from San Francisco to Ontario?

Currently, August is the cheapest month in which you can book a flight from San Francisco to Ontario (average of $160). Flying from San Francisco to Ontario in February is currently the most expensive (average of $317). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SFO to ONT?

Find hourly flight availability from San Francisco to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 27, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 64% on flights from San Francisco to Ontario by exploring options for tickets in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ontario. Price data was last updated on July 25, 2026.

Travelers seeking maximum savings on their San Francisco to Ontario flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from San Francisco to Ontario?

Airfare is below average for this route at the moment.

San Francisco to Ontario flights typically cost between $90 and $257 in September.
The cheapest round-trip price found within the last 5 days was $57 on Frontier (Sep 14-Sep 28).

The best insider tips for San Francisco to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your San Francisco to Ontario trip
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Harriet Baskas

Harriet Baskas

Expert on SFO

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 27, 2026.
Peruse reviews from past customers who have flown with Southwest,Alaska Airlines, andDelta from San Francisco to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,229 reviews
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Alaska Airlines
7.9
Good
12,721 reviews
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.8
Good
8,480 reviews
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
10,046 reviews
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.6
Fair
2,753 reviews
Southwest
8.0
Very good
4,229 reviews

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Overall

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Ontario is the airport most travelers will use when flying to Ontario from San Francisco. Booking flights from San Francisco (SFO) to Ontario (ONT) should be relatively easy as there are 8 daily flights to Ontario from 5 different airlines. 1h 23m is how long a flight from San Francisco to Ontario will take if you book a nonstop flight.

  • How popular is this San Francisco to Ontario flight route?

    Within the past month, 66 users have taken a look at flights from San Francisco to Ontario.

  • How long is the flight from San Francisco to Ontario?

    A quick flight from San Francisco to Ontario can take about 6h 15m. Southwest provides one of the quickest options available for as low as $151. San Francisco and Ontario are separated by a distance of 363 mi.

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

    Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $54. Additional round-trip tickets that might be worth considering are offered by Delta and United Airlines, with the lowest prices starting at $97 and $105, respectively. You may be able to fly from San Francisco to Ontario for 75% less than the average price by searching for these airlines.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $33. United Airlines flights start at $44 while deals on JetBlue start at $74 one-way.

  • What are the most reliable airlines from San Francisco to Ontario?

    No one likes to see their flight delayed. When booking a flight from San Francisco to Ontario consider choosing Copa Airlines (79%), United Airlines (78%) or Air Canada (76%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from San Francisco to Ontario?

    On average you can expect to pay $227 for a flight from San Francisco to Ontario. The cheapest flight overall is $28 while the most popular route, (San Francisco - Ontario) is currently priced at $57.

  • Can I find deals for flights from San Francisco to Ontario that include hotel bookings?

    Yes. In addition to deals on San Francisco to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ontario.

  • Can I find deals for business class flights from San Francisco to Ontario?

    Yes. Cheapflights offers flight deals from San Francisco to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Francisco to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Francisco to Ontario (average of $160). Flying from San Francisco to Ontario in February is currently the most expensive (average of $317). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for San Francisco to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from San Francisco to Ontario

Discover the top 6 airlines that operate flights from San Francisco to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$152FlexibilityNo cancel feeOn-time62%
DeltaCheapest$97Average$313FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$105Average$247FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$117Average$247FlexibilityNo cancel feeOn-time75%
JetBlueCheapest$142Average$302FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$150Average$246FlexibilityNo cancel feeOn-time63%

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