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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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
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 June 16, 2025.

Round-trip from

$57
(United Airlines)

One-way from

$39
(Southwest)

Popular in

April

Cheapest in

September

Average price

$175
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. 14% potential increase in price ($24 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 June 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 June 16, 2025.

This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/145:45 pmOAK - ONT
Nonstop1h 25mSouthwest
Mon 8/185:50 amONT - OAK
Nonstop1h 20mSouthwest
Deal found 6/16$77
This Frontier deal was found by Cheapflights users on 6/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Mon 7/149:41 pmONT - SFO
Nonstop1h 33mFrontier
Deal found 6/14$89
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1610:45 amSFO - ONT
Nonstop1h 29mUnited Airlines
Thu 7/176:10 amONT - SFO
Nonstop1h 27mUnited Airlines
Deal found 6/14$90
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/68:05 amSJC - ONT
Nonstop1h 15mSouthwest
Sat 8/93:45 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 6/16$114
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/71:40 pmSFO - ONT
2 stops8h 20mSouthwest
Mon 8/112:15 pmONT - SFO
2 stops9h 05mSouthwest
Deal found 6/16$161
This Frontier deal was found by Cheapflights users on 6/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/302:18 pmSJC - ONT
1 stop6h 33mFrontier
Wed 7/212:59 amONT - SJC
1 stop10h 19mFrontier
Deal found 6/14$200
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sat 7/198:00 amSFO - ONT
1 stop4h 00mAmerican Airlines
Mon 7/217:05 pmONT - SFO
1 stop4h 37mAmerican Airlines
Deal found 6/16$222
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/284:17 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Sun 8/319:00 amONT - STS
1 stop6h 47mAmerican Airlines
Deal found 6/14$223
This Kissandfly.com deal was found by Cheapflights users on 6/16. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/106:47 pmSTS - ONT
1 stop5h 12mHawaiian Airlines
Mon 7/1412:00 pmONT - STS
1 stop7h 07mHawaiian Airlines
Deal found 6/16$273
This Alaska Airlines deal was found by Cheapflights users on 6/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/138:00 amOAK - ONT
2 stops10h 04mAlaska Airlines
Mon 8/1812:00 pmONT - OAK
1 stop11h 59mAlaska Airlines
Deal found 6/14$298
This Delta deal was found by Cheapflights users on 6/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:20 amSJC - ONT
1 stop15h 22mDelta
Sat 9/276:45 amONT - SJC
1 stop11h 03mDelta
Deal found 6/16$323
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:00 amSJC - ONT
1 stop5h 32mAmerican Airlines
Mon 8/2512:22 pmONT - SJC
1 stop10h 03mAmerican Airlines
Deal found 6/14$332

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 June 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

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 8/14

5:45 pm-7:10 pm

Nonstop1h 25m

Ontario

Mon 8/18

5:50 am-7:10 am

Nonstop1h 20m

$77

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 7/13

10:11 pm-11:40 pm

Nonstop1h 29m

Ontario

Mon 7/14

9:41 pm-11:14 pm

Nonstop1h 33m

$89

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 7/16

10:45 am-12:14 pm

Nonstop1h 29m

Ontario

Thu 7/17

6:10 am-7:37 am

Nonstop1h 27m

$90

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 8/6

8:05 am-9:20 am

Nonstop1h 15m

Ontario

Sat 8/9

3:45 pm-5:00 pm

Nonstop1h 15m

$114

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 8/7

1:40 pm-10:00 pm

2 stops8h 20m

Ontario

Mon 8/11

2:15 pm-11:20 pm

2 stops9h 05m

$161

San JoseOntario

SJC - ONT

SJCONT

San Jose

Mon 6/30

2:18 pm-8:51 pm

1 stop6h 33m

Ontario

Wed 7/2

12:59 am-11:18 am

1 stop10h 19m

$200

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 8/13

5:50 am-11:32 am

1 stop5h 42m

Ontario

Fri 8/15

12:22 pm-6:39 pm

1 stop6h 17m

$202

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 8/28

4:17 pm-9:39 pm

1 stop5h 22m

Ontario

Sun 8/31

9:00 am-3:47 pm

1 stop6h 47m

$223

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 7/10

6:47 pm-11:59 pm

1 stop5h 12m

Ontario

Mon 7/14

12:00 pm-7:07 pm

1 stop7h 07m

$273

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 8/13

8:00 am-6:04 pm

2 stops10h 04m

Ontario

Mon 8/18

12:00 pm-11:59 pm

1 stop11h 59m

$298

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 42 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 $328). 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 June 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 June 16, 2025.

The most flights from zzXIH to ONT are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 16, 2025.
To help decide which airline to fly from San Francisco Bay Area to Ontario, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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
4,278 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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
7,963 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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
2,501 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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
8,801 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Food

7.1

Comfort

7.8

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 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 82 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $39 on Southwest. Other airlines that offer cheap prices include Frontier from $53 and United Airlines from $57 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: Copa Airlines (100%), SkyWest Airlines (92%), Air Canada( 89%).

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

    On average you can expect to pay $106 for a flight from San Francisco Bay Area to Ontario. The cheapest flight overall is $28 while the most popular route, (San Francisco - Ontario) is currently priced at $57.

  • 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 $328). 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 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 June 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$27Average$107FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$32Average$86FlexibilityNo cancel feeOn-time65%
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$58Average$230FlexibilityNo cancel feeOn-time69%
DeltaCheapest$58Average$179FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$280FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$149Average$274FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$198Average$282FlexibilityNo cancel feeOn-time71%

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