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San Francisco Bay Area

$38+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$56
(Cheapflightsfares)

One-way from

$38
(Cheapflightsfares)

Popular in

June

Cheapest in

October

Average price

$147
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. 5% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/98:24 amONT - SFO
Nonstop1h 38mFrontier
Sun 5/118:34 amSFO - ONT
Nonstop1h 28mFrontier
Deal found 4/17$56
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Thu 5/83:10 pmONT - SFO
Nonstop1h 43mUnited Airlines
Sat 5/107:05 pmSFO - ONT
Nonstop1h 29mUnited Airlines
Deal found 4/15$57
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/77:50 pmONT - OAK
Nonstop1h 20mSouthwest
Mon 5/126:55 pmOAK - ONT
Nonstop1h 25mSouthwest
Deal found 4/17$97
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/229:40 amONT - SJC
Nonstop1h 15mSouthwest
Mon 5/267:55 pmSJC - ONT
Nonstop1h 15mSouthwest
Deal found 4/17$97
This Frontier deal was found by Cheapflights users on 4/16. 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.
Fri 5/910:52 amONT - SJC
1 stop7h 49mFrontier
Sun 5/1112:20 pmSJC - ONT
1 stop11h 39mFrontier
Deal found 4/16$160
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/257:35 pmONT - SFO
1 stop3h 50mSouthwest
Tue 4/2911:55 amSFO - ONT
1 stop8h 15mSouthwest
Deal found 4/17$162
This Travelocity deal was found by Cheapflights users on 4/17. 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.
Wed 5/216:00 amONT - SFO
1 stop7h 43mMultiple Airlines
Thu 5/2210:11 pmSFO - ONT
Nonstop1h 25mMultiple Airlines
Deal found 4/17$185
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/204:35 pmONT - SFO
1 stop7h 23mAmerican Airlines
Sat 4/265:55 amSFO - ONT
1 stop6h 04mAmerican Airlines
Deal found 4/17$199
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/76:01 amONT - STS
1 stop6h 15mAmerican Airlines
Fri 5/912:46 pmSTS - ONT
1 stop5h 37mAmerican Airlines
Deal found 4/16$247
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/134:29 pmONT - OAK
1 stop7h 15mAlaska Airlines
Wed 5/148:00 amOAK - ONT
1 stop15h 58mAlaska Airlines
Deal found 4/16$272
This Expedia deal was found by Cheapflights users on 4/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2112:08 amONT - SJC
1 stop11h 13mMultiple Airlines
Tue 5/277:52 amSJC - ONT
2 stops14h 54mMultiple Airlines
Deal found 4/17$272
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/126:01 amONT - SJC
1 stop5h 57mAmerican Airlines
Tue 5/136:00 amSJC - ONT
1 stop5h 50mAmerican Airlines
Deal found 4/17$279

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 April 17, 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

Fri 5/9

8:24 am-10:02 am

Nonstop1h 38m

San Francisco

Sun 5/11

8:34 am-10:02 am

Nonstop1h 28m

$56

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 5/8

6:00 am-7:27 am

Nonstop1h 27m

San Francisco

Mon 5/12

10:54 am-12:24 pm

Nonstop1h 30m

$57

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 5/7

7:50 pm-9:10 pm

Nonstop1h 20m

Oakland

Mon 5/12

6:55 pm-8:20 pm

Nonstop1h 25m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/22

9:40 am-10:55 am

Nonstop1h 15m

San Jose

Mon 5/26

7:55 pm-9:10 pm

Nonstop1h 15m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 5/9

2:28 pm-6:41 pm

1 stop4h 13m

San Jose

Mon 5/12

12:20 pm-11:59 pm

1 stop11h 39m

$160

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/21

6:00 am-1:43 pm

1 stop7h 43m

San Francisco

Thu 5/22

10:11 pm-11:36 pm

Nonstop1h 25m

$185

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 5/6

1:14 pm-6:58 pm

1 stop5h 44m

San Francisco

Tue 5/13

3:50 pm-9:57 pm

1 stop6h 07m

$199

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/21

4:30 pm-10:55 pm

1 stop6h 25m

San Francisco

Thu 5/22

5:40 am-9:50 am

1 stop4h 10m

$231

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 5/7

6:01 am-12:16 pm

1 stop6h 15m

Santa Rosa Sonoma County

Fri 5/9

12:46 pm-6:23 pm

1 stop5h 37m

$247

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/21

12:08 am-11:21 am

1 stop11h 13m

San Jose

Tue 5/27

12:25 pm-6:25 pm

1 stop6h 00m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 37 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, January is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $276). Flying from Ontario to San Francisco Bay Area in June is currently the most expensive (average of $393). 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 April 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to San Francisco Bay Area as you normally would.

Weekly flight availability from Ontario to San Francisco Bay Area

Explore weekly flight availability from Ontario to San Francisco Bay Area. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 17, 2025.

The most flights from ONT to zzXIH are scheduled on a Thursday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in San Francisco Bay Area by month

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

In terms of precipitation, rainfall in San Francisco Bay Area 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 Bay Area when rainfall is around 0.0 in.

Temperature in San Francisco Bay Area by month

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

If weather is an important factor for your trip to San Francisco Bay Area, 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 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 April 17, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to San Francisco Bay Area. 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
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,380 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Boarding

8.1

Comfort

7.9

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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, 186 users have taken a look at flights from Ontario to San Francisco Bay Area.

  • 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 Frontier, which is currently one of the cheapest options available, starting at $38. United Airlines flights start at $39 while deals on Southwest start at $49 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 Copa Airlines (87%), United Airlines (84%) or SkyWest Airlines (83%) 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 $30. On average you can expect to pay $765. The most popular route, (Ontario - San Francisco), can usually be booked for $56.

  • 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, January is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $276). Flying from Ontario to San Francisco Bay Area in June is currently the most expensive (average of $393). 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

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Ontario to San Francisco Bay Area

Discover the top 9 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$84FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$88FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$66Average$230FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$338FlexibilityNo cancel feeOn-time75%
Avelo AirlinesCheapest$67Average$86FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$78Average$136FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$85Average$197FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$114Average$279FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$232Average$266FlexibilityNo cancel feeOn-time71%

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