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

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from San Francisco Bay Area to Ontario

Keep the following information in mind while searching for San Francisco Bay Area to Ontario flight deals. Data was last updated September 16, 2025.

Round-trip from

$72
(Frontier)

One-way from

$39
(Flightnetwork)

Popular in

April

Cheapest in

January

Average price

$147
From San Francisco Bay Area to Ontario
Search Deals
One-way flight from San Francisco Bay Area to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($17 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 September 2025
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Find flight deals from San Francisco Bay Area to Ontario

Cheapest flights from San Francisco Bay Area to Ontario
Explore the most affordable flight options available from San Francisco Bay Area to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2910:11 pmSFO - ONT
Nonstop1h 27mFrontier
Fri 10/310:40 pmONT - SFO
Nonstop1h 35mFrontier
Deal found 9/15$72
This Flightnetwork deal was found by Cheapflights users on 9/14. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1510:11 pmSFO - ONT
Nonstop1h 27mFrontier
Mon 9/229:46 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/14$74
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/710:21 pmSFO - ONT
Nonstop1h 29mFrontier
Sun 11/910:50 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/15$75
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Mon 10/1310:45 amSFO - ONT
Nonstop1h 28mUnited Airlines
Mon 10/206:36 pmONT - SFO
Nonstop1h 19mUnited Airlines
Deal found 9/15$77
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 10/1210:38 pmSFO - ONT
Nonstop1h 29mFrontier
Sun 10/1910:40 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/14$78
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1710:43 pmSFO - ONT
Nonstop1h 29mFrontier
Sun 10/1910:40 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/15$79
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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.
Thu 9/2510:11 pmSFO - ONT
Nonstop1h 27mFrontier
Thu 10/29:46 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/14$82
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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.
Thu 10/910:38 pmSFO - ONT
Nonstop1h 29mFrontier
Mon 10/1310:50 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/14$83
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1210:38 pmSFO - ONT
Nonstop1h 29mFrontier
Fri 10/1710:50 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/15$84
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 9/2610:11 pmSFO - ONT
Nonstop1h 27mFrontier
Mon 9/299:46 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/14$86
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:11 pmSFO - ONT
Nonstop1h 27mFrontier
Thu 10/910:40 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/15$87
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:11 pmSFO - ONT
Nonstop1h 27mFrontier
Mon 9/299:46 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 9/15$88

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco Bay Area to Ontario 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 September 16, 2025.
Use the filters below to find and compare flights from San Francisco Bay Area to Ontario that are best for you.

Fly from

San Francisco Bay Area

Fly to

Ontario

Route

Depart

Return

Price

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 10/21

11:35 am-12:55 pm

Nonstop1h 20m

Ontario

Sat 10/25

11:25 am-12:40 pm

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 11/15

7:05 am-8:20 am

Nonstop1h 15m

Ontario

Mon 11/17

11:10 am-12:25 pm

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 10/16

7:00 am-8:15 am

Nonstop1h 15m

Ontario

Thu 10/23

6:20 am-7:35 am

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 10/22

4:20 pm-9:25 pm

1 stop5h 05m

Ontario

Wed 11/12

11:10 am-12:25 pm

Nonstop1h 15m

$107

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 10/28

12:50 pm-9:25 pm

2 stops8h 35m

Ontario

Wed 11/5

6:50 pm-8:05 pm

Nonstop1h 15m

$112

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 10/15

7:55 am-1:45 pm

1 stop5h 50m

Ontario

Wed 10/29

2:20 pm-10:20 pm

2 stops8h 00m

$122

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 10/17

10:45 am-12:05 pm

Nonstop1h 20m

Ontario

Tue 10/21

6:00 am-7:10 am

Nonstop1h 10m

$134

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 10/22

11:35 am-12:55 pm

Nonstop1h 20m

Ontario

Sat 10/25

11:25 am-12:40 pm

Nonstop1h 15m

$134

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 10/9

7:00 am-8:15 am

Nonstop1h 15m

Ontario

Mon 10/13

7:55 pm-9:10 pm

Nonstop1h 15m

$134

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 10/9

5:35 am-6:55 am

Nonstop1h 20m

Ontario

Mon 10/13

8:35 pm-9:55 pm

Nonstop1h 20m

$134

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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

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

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

Currently, August is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $246). Flying from San Francisco Bay Area to Ontario in March is currently the most expensive (average of $327). 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 XIH to ONT?

Find hourly flight availability from San Francisco Bay Area to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

When flying from San Francisco Bay Area to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from San Francisco Bay Area to Ontario

Explore weekly flight availability from San Francisco Bay Area to Ontario. 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 September 16, 2025.

The most flights from zzXIH to ONT are scheduled on a Tuesday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated September 16, 2025.
Read reviews from past customers who have flown Southwest, Avelo Airlines, and United Airlines from San Francisco Bay Area to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Avelo Airlines
7.5
Good
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,924 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,174 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Francisco Bay Area to Ontario. 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 into for flights to Ontario from San Francisco Bay Area?

    Ontario (ONT) is the airport you will fly into if you book a flight from San Francisco Bay Area to Ontario. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

    The San Francisco Bay Area to Ontario flight path was viewed by 72 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 San Francisco Bay Area to Ontario?

    A quick flight from San Francisco Bay Area to Ontario can take about 1h 20m. Southwest provides one of the quickest options available for as low as $97. Airlines will cover a distance of 333 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The most popular flight routes from San Francisco Bay Area to Ontario are San Francisco - Ontario, San Jose - Ontario and Oakland - Ontario.

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

    Before booking your flight to Ontario from San Francisco Bay Area, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (83%), United Airlines (79%), Air Canada( 79%).

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

    On average you can expect to pay $123 for a flight from San Francisco Bay Area to Ontario. The cheapest flight overall is $38 while the most popular route, (San Francisco - Ontario) is currently priced at $53.

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

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

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco Bay Area to Ontario.

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

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

    Currently, August is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $246). Flying from San Francisco Bay Area to Ontario in March is currently the most expensive (average of $327). 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 San Francisco Bay Area to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from San Francisco Bay Area to Ontario

Discover the top 8 airlines that operate flights from San Francisco Bay Area to Ontario. 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$24Average$109FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$42Average$89FlexibilityNo cancel feeOn-time65%
Avelo AirlinesCheapest$57Average$80FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$58Average$186FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$59Average$260FlexibilityNo cancel feeOn-time75%
DeltaCheapest$75Average$193FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$134Average$275FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$260FlexibilityNo cancel feeOn-time71%

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