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San Francisco Bay Area

$39+ Cheap flights from Ontario (ONT) to San Francisco Bay Area

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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Cheap flight deals from Ontario to San Francisco Bay Area

Keep the following information in mind while searching for Ontario to San Francisco Bay Area flight deals. Data was last updated octubre 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$77
(United Airlines)

One-way from

$39
(United Airlines)

Popular in

May

Cheapest in

January

Average price

$152
Provider with most accurate pricing for Los Angeles-San Francisco flight deals.
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From Ontario to San Francisco Bay Area
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One-way flight from Ontario to San Francisco Bay Area
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Highest demand for flights based on searches. 12% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Ontario to San Francisco Bay Area

Cheapest flights from Ontario to San Francisco Bay Area
Explore the most affordable flight options available from Ontario to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 30, 2025.

This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/31:50 pmONT - SFO
Nonstop1h 24mUnited Airlines
sáb. 12/64:16 pmSFO - ONT
Nonstop1h 21mUnited Airlines
Deal found 10/30$77
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/510:12 pmONT - SFO
Nonstop1h 40mFrontier
jue. 12/119:03 pmSFO - ONT
Nonstop1h 26mFrontier
Deal found 10/29$78
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/1010:42 pmONT - SFO
Nonstop1h 29mFrontier
dom. 11/1610:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/28$80
This Gotogate deal was found by Cheapflights users on 10/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/410:12 pmONT - SFO
Nonstop1h 40mFrontier
lun. 12/84:59 pmSFO - ONT
1 stop4h 18mFrontier
Deal found 10/30$82
This Frontier deal was found by Cheapflights users on 10/30. 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.
jue. 11/1310:42 pmONT - SFO
Nonstop1h 29mFrontier
vie. 11/1410:21 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/30$84
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/137:44 pmONT - SFO
1 stop25h 51mFrontier
lun. 11/1710:21 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/30$86
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/1010:42 pmONT - SFO
Nonstop1h 29mFrontier
jue. 11/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/30$87
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/128:00 amONT - SFO
1 stop13h 22mFrontier
jue. 11/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/29$88
This Frontier deal was found by Cheapflights users on 10/30. 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.
jue. 11/1310:05 amONT - SFO
1 stop7h 44mFrontier
jue. 11/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/30$89
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:00 amONT - SFO
1 stop7h 00mFrontier
dom. 11/1610:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/29$90
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1510:12 pmONT - SFO
Nonstop1h 40mFrontier
lun. 1/1910:03 pmSFO - ONT
Nonstop1h 30mFrontier
Deal found 10/28$92
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/137:44 pmONT - SJC
1 stop21h 50mFrontier
lun. 11/176:19 pmSJC - ONT
1 stop3h 38mFrontier
Deal found 10/29$110

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Francisco Bay Area 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 octubre 30, 2025.
Use the filters below to find and compare flights from Ontario to San Francisco Bay Area that are best for you.

Fly from

Ontario

Fly to

San Francisco Bay Area

Route

Depart

Return

Price

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

vie. 12/5

6:00 am-7:24 am

Nonstop1h 24m

San Francisco

sáb. 12/6

9:28 pm-10:49 pm

Nonstop1h 21m

$104

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

sáb. 12/6

6:41 pm-8:05 pm

Nonstop1h 24m

San Francisco

jue. 12/11

10:55 am-12:18 pm

Nonstop1h 23m

$127

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

lun. 11/17

10:42 pm-12:11 am

Nonstop1h 29m

San Francisco

vie. 11/21

10:03 pm-11:31 pm

Nonstop1h 28m

$137

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

sáb. 12/6

6:00 am-7:24 am

Nonstop1h 24m

San Francisco

lun. 12/8

9:28 pm-10:49 pm

Nonstop1h 21m

$137

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

vie. 11/21

9:59 pm-11:29 pm

Nonstop1h 30m

San Francisco

dom. 11/23

10:03 pm-11:31 pm

Nonstop1h 28m

$138

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

dom. 12/7

6:00 am-7:24 am

Nonstop1h 24m

San Francisco

dom. 12/7

9:28 pm-10:49 pm

Nonstop1h 21m

$146

OntarioOakland

ONT - OAK

ONTOAK

Ontario

jue. 12/11

6:15 pm-7:40 pm

Nonstop1h 25m

Oakland

sáb. 12/13

6:25 am-7:45 am

Nonstop1h 20m

$160

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

mar. 12/9

7:55 am-9:10 am

Nonstop1h 15m

San Jose

mar. 12/9

10:35 am-11:55 am

Nonstop1h 20m

$169

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mié. 12/3

8:30 am-3:05 pm

2 stops6h 35m

San Francisco

sáb. 12/6

12:40 pm-7:00 pm

2 stops6h 20m

$171

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

mié. 12/3

8:40 am-12:10 pm

1 stop3h 30m

San Jose

mié. 12/3

3:35 pm-4:50 pm

Nonstop1h 15m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to San Francisco Bay Area

Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area 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 Bay Area

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

Currently, December is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $17). Flying from Ontario to San Francisco Bay Area in July is currently the most expensive (average of $51). 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 XIH?

Find hourly flight availability from Ontario to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octubre 30, 2025.

One of the essential ways to save on airfare from Ontario to San Francisco Bay Area 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 14% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco Bay Area. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to San Francisco Bay Area flight should consider departing on Friday mornings 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.

Reviews of airlines servicing San Francisco Bay Area

Get insights into the airlines that provide service to San Francisco Bay Area. 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 Bay Area. Reviews last updated octubre 30, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United Airlines from Ontario to San Francisco Bay Area by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,214 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,998 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,030 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,123 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

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

  • What airport do you fly from for flights from Ontario to San Francisco Bay Area?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to San Francisco Bay Area.

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

    Within the past month, 157 users have taken a look at flights from Ontario to San Francisco Bay Area.

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

    United Airlines, Frontier, and Southwest can get you from Ontario to San Francisco Bay Area in just under 1h 24m. Your travel time will be generally consistent. There are 363 mi between Ontario and San Francisco Bay Area. Most flights are nonstop.

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

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $39. Frontier flights start at $55 while deals on Southwest start at $75 one-way.

  • What are the most popular routes from Ontario to San Francisco Bay Area?

    The most popular route from Ontario to San Francisco Bay Area is Ontario - San Francisco. You may also consider Ontario - San Jose or Ontario - Oakland.

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

    Consider Emirates (85%), Air Canada (64%) or United Airlines (50%) when booking your flight. These represent the most reliable airlines when flying from Ontario to San Francisco Bay Area.

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

    The cheapest flight price from Ontario to San Francisco Bay Area is $39. On average you can expect to pay $584. The most popular route, (Ontario - San Francisco), can usually be booked for $72.

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

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

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

    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 Bay Area.

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

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

    Currently, December is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $17). Flying from Ontario to San Francisco Bay Area in July is currently the most expensive (average of $51). 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.

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Alternative routes for Ontario to San Francisco Bay Area

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Top 8 airlines flying from Ontario to San Francisco Bay Area

Discover the top 8 airlines that operate flights from Ontario to San Francisco Bay Area. 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 octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$106FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$48Average$85FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$185FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$200FlexibilityNo cancel feeOn-time75%
Avelo AirlinesCheapest$67Average$86FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$97Average$289FlexibilityNo cancel feeOn-time63%
DeltaCheapest$147Average$197FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$222Average$307FlexibilityNo cancel feeOn-time71%

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