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San Francisco Bay Area

$49+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$88
(Cheapflightsfares)

One-way from

$49
(Southwest)

Popular in

May

Cheapest in

October

Average price

$159
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. 19% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/129:41 pmONT - SFO
Nonstop1h 32mFrontier
Mon 10/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 7/29$88
This Southwest deal was found by Cheapflights users on 7/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1911:00 amONT - OAK
Nonstop1h 20mSouthwest
Tue 8/196:55 pmOAK - ONT
Nonstop1h 25mSouthwest
Deal found 7/29$97
This Southwest deal was found by Cheapflights users on 7/31. 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 8/2110:00 amONT - SJC
Nonstop1h 15mSouthwest
Sat 8/237:25 amSJC - ONT
Nonstop1h 15mSouthwest
Deal found 7/31$97
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/191:42 pmONT - SFO
Nonstop1h 19mUnited Airlines
Wed 8/207:10 pmSFO - ONT
Nonstop1h 23mUnited Airlines
Deal found 7/29$97
This CheapOair deal was found by Cheapflights users on 7/29. 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.
Sat 8/165:21 pmONT - SJC
1 stop18h 01mFrontier
Sun 8/177:00 pmSJC - ONT
1 stop25h 52mFrontier
Deal found 7/29$168
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/276:17 amONT - SJC
1 stop12h 10mAmerican Airlines
Wed 9/36:00 amSJC - ONT
1 stop10h 05mAmerican Airlines
Deal found 7/29$203
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:17 amONT - STS
1 stop6h 12mAmerican Airlines
Tue 9/212:59 pmSTS - ONT
1 stop4h 53mAmerican Airlines
Deal found 7/29$247
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:10 amONT - OAK
2 stops11h 17mAlaska Airlines
Wed 9/108:00 amOAK - ONT
2 stops10h 47mAlaska Airlines
Deal found 7/28$273
This Alaska Airlines deal was found by Cheapflights users on 7/31. 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.
Fri 8/227:22 pmONT - STS
1 stop24h 46mAlaska Airlines
Mon 8/257:00 amSTS - ONT
1 stop27h 44mAlaska Airlines
Deal found 7/31$332
This Hawaiian Airlines deal was found by Cheapflights users on 7/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/510:06 amONT - STS
1 stop6h 08mHawaiian Airlines
Mon 9/85:55 pmSTS - ONT
1 stop5h 59mHawaiian Airlines
Deal found 7/30$547

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 July 31, 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

Sun 10/12

9:41 pm-11:13 pm

Nonstop1h 32m

San Francisco

Mon 10/13

10:11 pm-11:40 pm

Nonstop1h 29m

$88

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 8/19

8:15 am-9:35 am

Nonstop1h 20m

Oakland

Wed 8/20

9:55 am-11:15 am

Nonstop1h 20m

$97

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 8/19

1:42 pm-3:01 pm

Nonstop1h 19m

San Francisco

Wed 8/20

7:10 pm-8:33 pm

Nonstop1h 23m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 8/21

10:00 am-11:15 am

Nonstop1h 15m

San Jose

Sat 8/23

7:25 am-8:40 am

Nonstop1h 15m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 8/16

5:21 pm-11:22 am

1 stop18h 01m

San Jose

Sun 8/17

7:00 pm-8:52 pm

1 stop25h 52m

$168

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 8/27

6:17 am-6:27 pm

1 stop12h 10m

San Jose

Wed 9/3

6:00 am-4:05 pm

1 stop10h 05m

$203

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 8/26

6:17 am-12:29 pm

1 stop6h 12m

Santa Rosa Sonoma County

Tue 9/2

12:59 pm-5:52 pm

1 stop4h 53m

$247

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 9/9

7:10 am-6:27 pm

2 stops11h 17m

Oakland

Wed 9/10

8:00 am-6:47 pm

2 stops10h 47m

$273

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 8/22

7:22 pm-8:08 pm

1 stop24h 46m

Santa Rosa Sonoma County

Mon 8/25

7:00 am-10:44 am

1 stop27h 44m

$332

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 9/5

10:06 am-4:14 pm

1 stop6h 08m

Santa Rosa Sonoma County

Mon 9/8

5:55 pm-11:54 pm

1 stop5h 59m

$547

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 25 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 $358). 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 July 31, 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 July 31, 2025.

The most flights from ONT to zzXIH are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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 July 31, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta 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
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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, 176 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 Southwest, which is currently one of the cheapest options available, starting at $49. United Airlines flights start at $49 while deals on Frontier start at $50 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 (91%), SkyWest Airlines (89%) or Copa Airlines (88%) 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 $41. On average you can expect to pay $376. The most popular route, (Ontario - San Francisco), can usually be booked for $67.

  • 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 $358). 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

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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 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$97FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$37Average$81FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$193FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$206FlexibilityNo cancel feeOn-time75%
Avelo AirlinesCheapest$67Average$86FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$85Average$197FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$114Average$289FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$232Average$266FlexibilityNo cancel feeOn-time71%

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