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$38+ 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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
abr. 22 — abr. 291
mar. 4/22
mar. 4/29
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 abril 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$58
(Frontier)

One-way from

$39
(Frontier)

Popular in

December

Cheapest in

September

Average price

$158
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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High demand for flights, 1% potential price rise
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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 April 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 abril 17, 2025.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/18:34 amSFO - ONT
Nonstop1h 28mFrontier
sáb. 5/38:24 amONT - SFO
Nonstop1h 38mFrontier
Deal found 4/17$58
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.
jue. 5/2212:50 pmSJC - ONT
Nonstop1h 20mSouthwest
lun. 5/266:35 amONT - SJC
Nonstop1h 15mSouthwest
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.
mar. 6/34:45 pmOAK - ONT
Nonstop1h 25mSouthwest
jue. 6/52:15 pmONT - OAK
Nonstop1h 15mSouthwest
Deal found 4/17$97
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/310:54 amSFO - ONT
Nonstop1h 30mUnited Airlines
sáb. 5/33:10 pmONT - SFO
Nonstop1h 43mUnited Airlines
Deal found 4/17$122
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/812:04 pmSJC - ONT
1 stop11h 55mFrontier
vie. 5/92:28 pmONT - SJC
1 stop4h 13mFrontier
Deal found 4/17$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.
jue. 5/15:40 amSFO - ONT
1 stop4h 10mSouthwest
lun. 5/57:20 pmONT - SFO
1 stop4h 30mSouthwest
Deal found 4/17$197
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.
jue. 5/157:52 amSJC - ONT
2 stops14h 54mMultiple Airlines
dom. 5/1812:59 amONT - SJC
1 stop10h 21mMultiple Airlines
Deal found 4/17$253
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/148:00 amOAK - ONT
1 stop15h 58mAlaska Airlines
mié. 5/214:45 pmONT - OAK
1 stop7h 01mAlaska 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.
sáb. 5/2412:46 pmSTS - ONT
1 stop5h 37mAmerican Airlines
dom. 5/2510:00 amONT - STS
1 stop5h 41mAmerican Airlines
Deal found 4/17$284
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/139:30 amSJC - ONT
2 stops10h 59mAlaska Airlines
sáb. 5/1711:51 amONT - SJC
1 stop10h 47mAlaska Airlines
Deal found 4/17$288
This lastminute.com 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/104:43 pmOAK - ONT
1 stop18h 08mHawaiian Airlines
dom. 5/114:29 pmONT - OAK
1 stop7h 15mHawaiian Airlines
Deal found 4/17$360
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.
sáb. 5/1012:48 pmSJC - ONT
1 stop5h 35mAmerican Airlines
dom. 5/116:01 amONT - SJC
1 stop16h 45mAmerican Airlines
Deal found 4/17$370

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 abril 17, 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 FranciscoOntario

SFO - ONT

SFOONT

San Francisco

jue. 5/1

8:34 am-10:02 am

Nonstop1h 28m

Ontario

sáb. 5/3

8:24 am-10:02 am

Nonstop1h 38m

$58

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

vie. 7/11

4:16 pm-5:43 pm

Nonstop1h 27m

Ontario

mié. 7/16

6:39 pm-8:06 pm

Nonstop1h 27m

$92

San JoseOntario

SJC - ONT

SJCONT

San Jose

jue. 5/22

12:50 pm-2:10 pm

Nonstop1h 20m

Ontario

lun. 5/26

6:35 am-7:50 am

Nonstop1h 15m

$97

OaklandOntario

OAK - ONT

OAKONT

Oakland

mar. 6/3

4:45 pm-6:10 pm

Nonstop1h 25m

Ontario

jue. 6/5

2:15 pm-3:30 pm

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

jue. 5/8

12:04 pm-11:59 pm

1 stop11h 55m

Ontario

vie. 5/9

2:28 pm-6:41 pm

1 stop4h 13m

$160

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

sáb. 5/3

10:45 am-3:35 pm

1 stop4h 50m

Ontario

dom. 5/4

8:10 pm-12:45 am

1 stop4h 35m

$174

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

sáb. 5/17

10:48 am-12:15 pm

Nonstop1h 27m

Ontario

mié. 5/21

6:00 am-1:43 pm

1 stop7h 43m

$175

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

vie. 4/25

12:06 pm-6:20 pm

1 stop6h 14m

Ontario

lun. 4/28

7:25 pm-11:58 pm

1 stop4h 33m

$199

San JoseOntario

SJC - ONT

SJCONT

San Jose

jue. 5/15

7:52 am-10:46 pm

2 stops14h 54m

Ontario

dom. 5/18

12:59 am-11:20 am

1 stop10h 21m

$253

OaklandOntario

OAK - ONT

OAKONT

Oakland

mié. 5/14

8:00 am-11:58 pm

1 stop15h 58m

Ontario

mié. 5/21

4:45 pm-11:46 pm

1 stop7h 01m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 37 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 abril 17, 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 abril 17, 2025.

The most flights from zzXIH to ONT are scheduled on a Thursday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 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 abril 17, 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
9,887 reviews

Boarding

8.1

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

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 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 101 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 Frontier. Other airlines that offer cheap prices include Southwest from $49 and United Airlines from $64 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%), Frontier (94%), SkyWest Airlines( 88%).

  • 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 $28 while the most popular route, (San Francisco - Ontario) is currently priced at $55.

  • 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 9 airlines flying from San Francisco Bay Area to Ontario

Discover the top 9 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 abril 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$94FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$32Average$103FlexibilityNo cancel feeOn-time65%
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$58Average$163FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$308FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$76Average$239FlexibilityNo cancel feeOn-time69%
Breeze AirwaysCheapest$78Average$110FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$146Average$276FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$228Average$301FlexibilityNo cancel feeOn-time71%

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