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$59+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
feb. 7 — feb. 141
sáb. 2/7
sáb. 2/14
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 enero 8, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$104
(Frontier)

One-way from

$59
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$146
Provider with most accurate pricing for San Francisco-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Los Angeles flights.
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From San Francisco Bay Area to Ontario
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One-way flight from San Francisco Bay Area to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 enero 8, 2026.

This CheapTickets deal was found by Cheapflights users on 1/6. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/2910:41 amSTS - ONT
Nonstop1h 27mAlaska Airlines
mar. 5/1212:48 pmONT - STS
Nonstop1h 32mAlaska Airlines
Deal found 1/6$113
This Alaska Airlines deal was found by Cheapflights users on 1/8. 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.
jue. 4/92:12 pmSTS - ONT
Nonstop1h 30mAlaska Airlines
sáb. 4/184:22 pmONT - STS
Nonstop2h 00mAlaska Airlines
Deal found 1/8$117
This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
mié. 2/187:15 pmSFO - ONT
2 stops14h 19mFrontier
lun. 3/99:06 amONT - SFO
Nonstop1h 42mFrontier
Deal found 1/7$122
This Frontier deal was found by Cheapflights users on 1/7. 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. 4/138:43 amSFO - ONT
1 stop8h 15mFrontier
lun. 4/1310:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 1/7$124
This CheapOair deal was found by Cheapflights users on 1/6. 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. 3/98:53 amSFO - ONT
Nonstop1h 29mFrontier
mar. 3/104:49 pmONT - SFO
1 stop4h 30mFrontier
Deal found 1/6$125
This Frontier deal was found by Cheapflights users on 1/7. 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. 3/58:43 amSFO - ONT
1 stop4h 28mFrontier
vie. 3/69:06 amONT - SFO
Nonstop1h 42mFrontier
Deal found 1/7$127
This Alaska Airlines deal was found by Cheapflights users on 1/8. 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.
vie. 4/32:12 pmSTS - ONT
Nonstop1h 30mAlaska Airlines
lun. 4/64:22 pmONT - STS
Nonstop2h 00mAlaska Airlines
Deal found 1/8$127
This Frontier deal was found by Cheapflights users on 1/6. 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.
mar. 2/37:00 amSFO - ONT
1 stop8h 07mFrontier
mar. 2/108:36 amONT - SFO
1 stop13h 25mFrontier
Deal found 1/6$128
This CheapOair deal was found by Cheapflights users on 1/6. 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.
sáb. 1/314:46 pmSFO - ONT
1 stop21h 07mFrontier
mar. 2/37:15 amONT - SFO
1 stop16h 26mFrontier
Deal found 1/6$129
This Kiwi.com deal was found by Cheapflights users on 1/6. 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.
dom. 2/19:32 pmSFO - ONT
1 stop14h 38mFrontier
jue. 2/511:04 amONT - SFO
1 stop8h 24mFrontier
Deal found 1/6$131
This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
dom. 1/256:15 amSFO - ONT
1 stop18h 05mFrontier
jue. 1/2911:04 amONT - SFO
1 stop8h 24mFrontier
Deal found 1/7$132
This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
dom. 1/256:15 amSFO - ONT
1 stop18h 05mFrontier
vie. 1/3010:18 amONT - SFO
1 stop6h 42mFrontier
Deal found 1/7$134

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 enero 8, 2026.
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

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

lun. 4/27

10:41 am-12:08 pm

Nonstop1h 27m

Ontario

mié. 5/6

12:48 pm-2:20 pm

Nonstop1h 32m

$117

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mié. 3/25

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

lun. 3/30

4:22 pm-6:22 pm

Nonstop2h 00m

$117

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

lun. 4/27

10:41 am-12:08 pm

Nonstop1h 27m

Ontario

mar. 5/5

12:48 pm-2:20 pm

Nonstop1h 32m

$117

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mié. 3/18

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

sáb. 3/21

4:22 pm-6:22 pm

Nonstop2h 00m

$117

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mar. 4/7

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

sáb. 4/11

4:22 pm-6:22 pm

Nonstop2h 00m

$127

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mié. 4/8

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

sáb. 4/11

4:22 pm-6:22 pm

Nonstop2h 00m

$127

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

lun. 4/6

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

sáb. 4/11

4:22 pm-6:22 pm

Nonstop2h 00m

$127

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

vie. 4/3

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

lun. 4/6

4:22 pm-6:22 pm

Nonstop2h 00m

$127

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mié. 4/22

10:41 am-12:08 pm

Nonstop1h 27m

Ontario

dom. 4/26

12:48 pm-2:20 pm

Nonstop1h 32m

$127

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

vie. 4/3

2:12 pm-3:42 pm

Nonstop1h 30m

Ontario

vie. 4/10

4:22 pm-6:22 pm

Nonstop2h 00m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

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, February is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $19). Flying from San Francisco Bay Area to Ontario in July is currently the most expensive (average of $57). 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 enero 8, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 22% on flights from San Francisco Bay Area to Ontario by exploring options for tickets in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco Bay Area to Ontario. Price data was last updated on January 3, 2026.

Travelers seeking maximum savings on their San Francisco Bay Area to Ontario flight should consider departing on Friday mornings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 enero 8, 2026.
Read reviews from past customers who have flown Alaska Airlines, Southwest, 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.
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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
11,672 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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
4,250 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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
9,142 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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
11,097 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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
5.7
Fair
3,061 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

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 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 54 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 25m. Alaska Airlines provides one of the quickest options available for as low as $173. Airlines will cover a distance of 361 mi. Generally, flights for this route are nonstop.

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

    One-way options have recently been found by users for as low as $19 on Frontier. Other airlines that offer cheap prices include United Airlines from $28 and Southwest from $48 one-way.

  • 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: Air Canada (81%), Emirates (73%), United Airlines( 67%).

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

    On average you can expect to pay $179 for a flight from San Francisco Bay Area to Ontario. The cheapest flight overall is $59 while the most popular route, (San Francisco - Ontario) is currently priced at $141.

  • 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, February is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $19). Flying from San Francisco Bay Area to Ontario in July is currently the most expensive (average of $57). 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 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 7 airlines flying from San Francisco Bay Area to Ontario

Discover the top 7 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 enero 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$22Average$88FlexibilityNo cancel feeOn-time65%
FrontierCheapest$29Average$125FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$59Average$216FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$59Average$244FlexibilityNo cancel feeOn-time75%
DeltaCheapest$97Average$200FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$113Average$275FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$252FlexibilityNo cancel feeOn-time71%

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