HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Francisco

$33+ 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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Ontario to San Francisco are usually found in July or April, booked 89 days in advance, depart on a Tuesday or Monday and return on a Wednesday

Cheap 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 December 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$57
(United Airlines)

One-way from

$33
(Cheapflightsfares)

Popular in

February

Cheapest in

July

Average price

$158
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
High demand for flights, 31% potential price rise
Search Deals
Best time to find cheap flights, 6% potential price drop
Search Deals
Average for round-trip flights in December 2024
Search Deals

Find 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 December 18, 2024.

This FlightHub deal was found by Cheapflights users on 12/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2312:00 pmONT - SFO
Nonstop1h 29mFrontier
Fri 1/35:32 pmSFO - ONT
Nonstop1h 25mFrontier
Deal found 12/17$78
This Travelocity deal was found by Cheapflights users on 12/17. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3112:59 amONT - SFO
1 stop7h 00mMultiple Airlines
Sat 1/117:55 pmSFO - ONT
2 stops14h 43mMultiple Airlines
Deal found 12/17$331

Find flights from Ontario to San Francisco within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 1/9

10:47 am-12:20 pm

Nonstop1h 33m

San Francisco

Sat 1/11

4:50 pm-6:19 pm

Nonstop1h 29m

$57

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 1/13

6:45 am-8:20 am

Nonstop1h 35m

San Francisco

Mon 1/13

9:59 pm-11:23 pm

Nonstop1h 24m

$58

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 1/9

11:26 am-10:10 pm

1 stop10h 44m

San Francisco

Sun 1/12

9:59 pm-11:23 pm

Nonstop1h 24m

$125

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 1/25

12:48 pm-6:59 pm

1 stop6h 11m

San Francisco

Sun 1/26

4:18 pm-9:58 pm

1 stop5h 40m

$184

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 1/28

11:14 am-7:16 pm

1 stop8h 02m

San Francisco

Wed 1/29

11:00 am-5:04 pm

1 stop6h 04m

$202

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 1/27

10:55 am-10:35 pm

1 stop11h 40m

San Francisco

Thu 1/30

6:35 am-3:05 pm

2 stops8h 30m

$231

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 2/14

8:26 am-10:02 am

Nonstop1h 36m

$33

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 1/15

6:15 am-7:46 am

Nonstop1h 31m

$59

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 2/19

12:50 pm-6:57 pm

1 stop6h 07m

$84

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 1/8

11:14 am-7:16 pm

1 stop8h 02m

$101

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 12 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
CheapOairPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust 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.

Travel insights for flights from Ontario to San Francisco

Get recent, data-driven insights about flights from Ontario to San Francisco including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Francisco. Price data was last updated on December 13, 2024.

Booking 89 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, January is the cheapest month in which you can book a flight from Ontario to San Francisco (average of $276). Flying from Ontario to San Francisco in June is currently the most expensive (average of $381). 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 December 18, 2024.

One of the essential ways to save on airfare from Ontario to San Francisco is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 47% 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 December 16, 2024.

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

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 December 18, 2024.
Read reviews from past customers who have flown United Airlines, Frontier and Southwest from Ontario to San Francisco. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Frontier
6.1
Okay
3,479 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

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 27m on average. When it comes time to book airfare, you have a few options: there are 4 outbound flights from Ontario to San Francisco offered by 6 different airlines.

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

    This flight path from Ontario to San Francisco was viewed by 164 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Flying on United Airlines is currently your cheapest option to San Francisco, with prices starting at $57. Additional round-trip tickets that might be worth considering are offered by Frontier and American Airlines, with the lowest prices starting at $58 and $184, respectively. You may be able to fly from Ontario to San Francisco for 54% 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 $33. However, be on the lookout for offers from United Airlines and American Airlines, 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: Frontier (88%), Air Canada (77%), United Airlines (77%).

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

    On average you can expect to pay $1,233 for a flight from Ontario to San Francisco. The cheapest flight overall is $32 while the most popular route, (Ontario - San Francisco) is currently priced at $57.

  • 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, January is the cheapest month in which you can book a flight from Ontario to San Francisco (average of $276). Flying from Ontario to San Francisco in June is currently the most expensive (average of $381). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
Santa Ana to Las Vegas flights
Oakland to Las Vegas flights
San Jose to Las Vegas flights
Burbank to Las Vegas flights
San Jose to Los Angeles flights
Oakland to Los Angeles flights
Los Angeles to San Jose flights
Los Angeles to Oakland flights
Ontario to Las Vegas flights
San Francisco to Ontario flights
San Francisco to San Diego flights
Oakland to Burbank flights
Oakland to Santa Ana flights
Burbank to Oakland flights
Sacramento to Las Vegas flights
San Francisco to Santa Ana flights
Las Vegas to Los Angeles flights
Santa Ana to Oakland flights
Santa Ana to San Francisco flights
Sacramento to Los Angeles flights
Los Angeles to Sacramento flights
San Francisco to Palm Springs flights
San Francisco to Burbank flights
San Diego to San Francisco flights
San Jose to San Diego flights
San Diego to Las Vegas flights
Burbank to San Francisco flights
Oakland to San Diego flights
San Jose to Santa Ana flights
Sacramento to San Diego flights
Las Vegas to Santa Ana flights
Las Vegas to Burbank flights
Los Angeles to Reno flights
Sacramento to Santa Ana flights
Fresno to Las Vegas flights
San Diego to San Jose flights
San Jose to Ontario flights
Burbank to Sacramento flights
Santa Ana to Sacramento flights
Stockton to Las Vegas flights
Sacramento to Burbank flights
Santa Ana to San Jose flights
Las Vegas to San Francisco flights
Ontario to San Jose flights
San Diego to Oakland flights

Top 6 airlines flying from Ontario to San Francisco

Discover the top 6 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$31Average$65FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$88FlexibilityNo cancel feeOn-time62%
Breeze AirwaysCheapest$78Average$139FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$85Average$184FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$93Average$162FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$132Average$263FlexibilityNo cancel feeOn-time69%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.