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$41+ Cheap flights from Ontario to San Francisco (ONT - SFO)

ONT — SFO
Nov 18 — Nov 251
Wed 11/18
Wed 11/25
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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Ontario to San Francisco are usually found in August or October, booked 73 days in advance, depart on a Saturday or Friday and return on a Monday

Cheap flight deals from Ontario to San Francisco

Cheapest flights from Ontario to San Francisco

Thu 12/107:26 pm -
Nonstop1h 35m
Wed 12/169:56 pm -
Nonstop1h 27m
Deal found 10/18$79
Thu 11/512:01 pm -
Nonstop1h 35m
Fri 11/612:20 pm -
1 stop22h 22m
Deal found 10/14$83
Tue 11/2410:40 pm -
1 stop12h 21m
Wed 12/29:56 pm -
Nonstop1h 23m
Deal found 10/14$84
Fri 11/1312:01 pm -
Nonstop1h 35m
Mon 11/166:04 pm -
Nonstop1h 26m
Deal found 10/16$85
Thu 12/177:11 am -
Nonstop1h 33m
Mon 12/217:41 am -
Nonstop1h 29m
Deal found 10/14$86
Tue 12/12:47 pm -
1 stop21h 08m
Wed 12/29:56 pm -
Nonstop1h 23m
Deal found 10/14$87
Wed 11/45:07 pm -
1 stop19h 45m
Fri 11/66:04 pm -
Nonstop1h 26m
Deal found 10/14$88
Sat 11/1411:52 am -
1 stop12h 28m
Mon 11/166:04 pm -
Nonstop1h 26m
Deal found 10/14$89
Thu 11/1912:01 pm -
Nonstop1h 35m
Sun 11/2210:59 pm -
Nonstop1h 25m
Deal found 10/14$90
Sat 11/218:31 pm -
Nonstop1h 33m
Sun 11/2210:59 pm -
Nonstop1h 25m
Deal found 10/15$91
Tue 12/811:23 am -
1 stop6h 11m
Wed 12/99:56 pm -
Nonstop1h 27m
Deal found 10/16$92
Sat 12/56:00 am -
1 stop27h 39m
Sun 12/69:56 pm -
Nonstop1h 27m
Deal found 10/14$93

Find flight deals from Ontario to San Francisco

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$79
(Cheapflightsfares)

One-way from

$41
(Cheapflightsfares)

Popular in

February

Cheapest in

August

Average price

$169

Good round-trip deal

$162 or less

Good one-way deal

$123 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. 18% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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

 
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

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Fri 1/22

3:00 pm-8:30 pm

1 stop5h 30m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$76

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 11/14

9:30 am-6:40 pm

2 stops9h 10m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$87
Quickest round-trip

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 11/14

1:35 pm-3:05 pm

Nonstop1h 30m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$104

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 3/3

6:35 pm-8:08 pm

Nonstop1h 33m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$104

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 12/31

4:00 pm-5:50 pm

Nonstop1h 50m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$131

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 12/8

5:55 am-12:20 pm

1 stop6h 25m

San Francisco

Wed 12/9

12:00 pm-7:55 pm

2 stops7h 55m

$136

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 11/10

4:17 pm-5:50 pm

Nonstop1h 33m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$141

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 2/4

6:37 pm-8:10 pm

Nonstop1h 33m

San Francisco

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$144

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Wed 12/2

3:50 pm-8:35 pm

1 stop4h 45m

San Francisco

Wed 12/9

12:00 pm-7:55 pm

2 stops7h 55m

$156

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Thu 12/3

5:55 am-12:20 pm

1 stop6h 25m

San Francisco

Tue 12/8

9:25 am-5:40 pm

2 stops8h 15m

$170

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/15

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

Compare providers for flights from Ontario to San Francisco

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Super.comPrice Accuracy-Trust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust 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

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 72 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 $161). Flying from Ontario to San Francisco in February is currently the most expensive (average of $307). 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?

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 62% on airfare.

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

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

Airfare is below average for this route at the moment.

Ontario to San Francisco flights typically cost between $117 and $256 in December.
The cheapest round-trip price found within the last 5 days was $79 on Frontier (Dec 10-Dec 16).

The best insider tips for Ontario to San Francisco flights

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

See what other customers who have flown with Alaska Airlines,Southwest, 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.
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Alaska Airlines
7.9
Good
13,087 reviews
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Southwest
7.9
Good
4,209 reviews
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
United Airlines
7.3
Good
10,387 reviews
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
JetBlue
7.1
Good
3,059 reviews
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Frontier
5.5
Fair
2,528 reviews
Alaska Airlines
7.9
Good
13,087 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.

Related info for your journey

  • 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 29m on average. When it comes time to book airfare, you have a few options: there are 6 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 93 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 30m. Southwest provides one of the quickest options available for as low as $207. 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 $51. Additional round-trip tickets that might be worth considering are offered by Alaska Airlines and United Airlines, with the lowest prices starting at $91 and $117, respectively. You may be able to fly from Ontario to San Francisco for 77% 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 $28. However, be on the lookout for offers from Delta and United 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: Emirates (88%), SkyWest Airlines (73%), United Airlines (70%).

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

    On average you can expect to pay $619 for a flight from Ontario to San Francisco. The cheapest flight overall is $41 while the most popular route, (Ontario - San Francisco) is currently priced at $53.

  • 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 $161). Flying from Ontario to San Francisco in February is currently the most expensive (average of $307). 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?

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Top 5 airlines flying from Ontario to San Francisco

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$159FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$91Average$192FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$117Average$260FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$120Average$169FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$226Average$344FlexibilityNo cancel feeOn-time63%

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