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$59+ Cheap flights from Ontario to San Francisco (ONT - SFO)

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Jul 2 — Jul 91
Thu 7/2
Thu 7/9
1 adult, Economy
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Find cheap flights from Ontario to San Francisco 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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Ontario to San Francisco are usually found in August or October, booked 77 days in advance, depart on a Friday or Thursday and return on a Monday

Cheap flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 2, 2026.

This Trip.com deal was found by Cheapflights users on 6/1. 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.
Mon 8/38:58 am
ONT
-
SFO
Nonstop1h 32m
Frontier
Wed 8/511:15 am
SFO
-
ONT
Nonstop1h 33m
Frontier
Deal found 6/1$106
This Super.com deal was found by Cheapflights users on 5/29. 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.
Tue 7/78:58 am
ONT
-
SFO
Nonstop1h 32m
Frontier
Tue 7/1411:15 am
SFO
-
ONT
Nonstop1h 38m
Frontier
Deal found 5/29$107
This Frontier deal was found by Cheapflights users on 6/2. 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 7/258:58 am
ONT
-
SFO
Nonstop1h 32m
Frontier
Sat 8/19:33 am
SFO
-
ONT
Nonstop1h 34m
Frontier
Deal found 6/2$108
This Frontier deal was found by Cheapflights users on 5/30. 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.
Wed 7/298:58 am
ONT
-
SFO
Nonstop1h 32m
Frontier
Wed 8/511:15 am
SFO
-
ONT
Nonstop1h 33m
Frontier
Deal found 5/30$109
This Kissandfly.com deal was found by Cheapflights users on 6/2. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/258:36 pm
ONT
-
SFO
Nonstop1h 37m
Frontier
Mon 6/299:41 am
SFO
-
ONT
Nonstop1h 32m
Frontier
Deal found 6/2$110
This Super.com deal was found by Cheapflights users on 6/1. 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 8/208:33 pm
ONT
-
SFO
Nonstop1h 32m
Frontier
Tue 8/2511:12 am
SFO
-
ONT
Nonstop1h 30m
Frontier
Deal found 6/1$111
This Frontier deal was found by Cheapflights users on 5/29. 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.
Thu 9/38:33 pm
ONT
-
SFO
Nonstop1h 32m
Frontier
Mon 9/79:31 am
SFO
-
ONT
Nonstop1h 27m
Frontier
Deal found 5/29$112
This Super.com deal was found by Cheapflights users on 5/28. 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.
Mon 6/228:36 pm
ONT
-
SFO
Nonstop1h 37m
Frontier
Wed 6/2411:13 am
SFO
-
ONT
Nonstop1h 35m
Frontier
Deal found 5/28$116
This Frontier deal was found by Cheapflights users on 5/29. 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 6/228:36 pm
ONT
-
SFO
Nonstop1h 37m
Frontier
Tue 6/2311:13 am
SFO
-
ONT
Nonstop1h 35m
Frontier
Deal found 5/29$117
This Frontier deal was found by Cheapflights users on 5/29. 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.
Thu 6/258:36 pm
ONT
-
SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
-
ONT
Nonstop1h 35m
Frontier
Deal found 5/29$118
This Frontier deal was found by Cheapflights users on 5/29. 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.
Wed 9/28:33 pm
ONT
-
SFO
Nonstop1h 32m
Frontier
Thu 9/39:31 am
SFO
-
ONT
Nonstop1h 27m
Frontier
Deal found 5/29$122

Find flight deals from Ontario to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Francisco (SFO). 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 June 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$106
(Trip.com)

One-way from

$59
(CheapOair)

Popular in

February

Cheapest in

August

Average price

$162

Good round-trip deal

$167 or less

Good one-way deal

$120 or less
Provider with most accurate pricing for Ontario-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-San Francisco flights.
Search Deals
From Ontario to San Francisco
Search Deals
One-way flight from Ontario to San Francisco
Search Deals
Highest demand for flights based on searches. 27% potential increase in price ($75 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 June 2026
Search Deals
Price to beat on a round-trip flight from Ontario to San Francisco.
Search Deals
Price to beat on a one-way flight from Ontario to San Francisco.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Francisco 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 June 2, 2026.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 7/1

1:50 pm-3:15 pm

Nonstop1h 25m

San Francisco

Wed 7/8

10:40 am-12:12 pm

Nonstop1h 32m

$137

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 7/15

7:20 pm-11:30 pm

1 stop4h 10m

San Francisco

Wed 7/22

2:15 pm-8:20 pm

1 stop6h 05m

$157

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 7/14

4:35 pm-10:35 pm

2 stops6h 00m

San Francisco

Wed 7/22

6:00 am-2:05 pm

2 stops8h 05m

$167

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 8/6

5:45 pm-11:25 pm

1 stop5h 40m

San Francisco

Mon 8/10

5:10 am-9:55 am

1 stop4h 45m

$201

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 6/24

6:00 am-7:25 am

Nonstop1h 25m

San Francisco

Wed 6/24

10:40 am-12:12 pm

Nonstop1h 32m

$202

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 7/4

5:25 am-9:10 am

1 stop3h 45m

San Francisco

Wed 7/8

6:00 am-11:30 am

1 stop5h 30m

$207

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 8/27

2:40 pm-8:35 pm

2 stops5h 55m

San Francisco

Mon 8/31

7:00 am-3:15 pm

2 stops8h 15m

$211

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 7/28

10:10 am-3:00 pm

1 stop4h 50m

San Francisco

Thu 7/30

5:30 am-12:45 pm

2 stops7h 15m

$212

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 10/31

6:00 am-7:29 am

Nonstop1h 29m

San Francisco

Sat 10/31

10:50 am-12:20 pm

Nonstop1h 30m

$246

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 7/16

5:15 am-11:20 am

2 stops6h 05m

San Francisco

Thu 7/23

6:45 pm-12:10 am

1 stop5h 25m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/31

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Ontario to San Francisco

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 Ontario to San Francisco in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
CheapTicketsDealPrice 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 Ontario-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Francisco 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 Ontario-San Francisco 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 Ontario to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario 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 Ontario to San Francisco

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

Booking 76 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to San Francisco. 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 Ontario to San Francisco?

Currently, August is the cheapest month in which you can book a flight from Ontario to San Francisco (average of $141). Flying from Ontario to San Francisco in February is currently the most expensive (average of $298). 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 ONT to SFO?

Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 2, 2026.

One of the essential ways to save on airfare from Ontario to San Francisco is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 66% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco. Price data was last updated on May 30, 2026.

Travelers seeking maximum savings on their Ontario to San Francisco flight should consider departing on Saturday evenings when fares are most often at their lowest. Monday afternoons 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 Ontario to San Francisco?

The best insider tips for Ontario to San Francisco 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 Ontario to San Francisco trip
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on United Airlines and 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
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
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

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated June 2, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andUnited Airlines from Ontario to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
Southwest
8.0
Very good
4,255 reviews
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
Alaska Airlines
7.9
Good
12,462 reviews
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
United Airlines
7.4
Good
9,772 reviews
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
JetBlue
7.1
Good
2,981 reviews
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!
Frontier
5.6
Fair
2,921 reviews
Southwest
8.0
Very good
4,255 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Walter,May 2026

LAS - BUR

Short but excellent flight. Everyone was friendly and professional it was a great flight!

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Francisco. 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 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 25m on average. When it comes time to book airfare, you have a few options: there are 8 outbound flights from Ontario to San Francisco offered by 5 different airlines.

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

    This flight path from Ontario to San Francisco was viewed by 72 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    A quick flight from Ontario to San Francisco can take about 1h 25m. United Airlines provides one of the quickest options available for as low as $137. The distance from Ontario to San Francisco is about 363 mi. This flight may include one or multiple stops.

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

    Flying on Frontier is currently your cheapest option to San Francisco, with prices starting at $49. Additional round-trip tickets that might be worth considering are offered by Alaska Airlines and United Airlines, with the lowest prices starting at $78 and $79, respectively. You may be able to fly from Ontario to San Francisco for 75% less than the average price by searching for these airlines.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $39. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Ontario to San Francisco for a low price.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ontario to San Francisco on time: Emirates (59%), Air Canada (53%), United Airlines (44%).

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

    On average you can expect to pay $779 for a flight from Ontario to San Francisco. The cheapest flight overall is $69 while the most popular route, (Ontario - San Francisco) is currently priced at $56.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to San Francisco 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 Ontario to San Francisco?

    Currently, August is the cheapest month in which you can book a flight from Ontario to San Francisco (average of $141). Flying from Ontario to San Francisco in February is currently the most expensive (average of $298). 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
South San Francisco
Santa Cruz
Santa Clara
Fairfield
Rancho Cordova
Cupertino
San Bruno
Watsonville
San Ramon
Vacaville
Roseville
San Carlos
Redwood City
Daly City
Sunnyvale
Turlock
Vallejo
San Lorenzo
Davis
Emeryville

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to San Francisco

Discover the top 5 airlines that operate flights from Ontario to San Francisco. 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 June 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$49Average$139FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$78Average$157FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$79Average$224FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$153Average$169FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$226Average$338FlexibilityNo cancel feeOn-time63%

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