HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$49+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
ago. 7 — ago. 141
jue. 8/7
jue. 8/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Francisco Bay Area to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 agosto 2, 2025.

Round-trip from

$78
(Gotogate)

One-way from

$49
(Southwest)

Popular in

April

Cheapest in

September

Average price

$131
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. 12% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 agosto 2, 2025.

This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/117:10 pmSFO - ONT
Nonstop1h 23mUnited Airlines
lun. 9/156:50 pmONT - SFO
Nonstop1h 19mUnited Airlines
Deal found 7/31$97
This Southwest deal was found by Cheapflights users on 8/1. 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.
sáb. 9/1311:15 amSJC - ONT
Nonstop1h 15mSouthwest
lun. 9/157:55 pmONT - SJC
Nonstop1h 10mSouthwest
Deal found 8/1$97
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/286:05 amOAK - ONT
Nonstop1h 25mSouthwest
lun. 9/15:50 amONT - OAK
Nonstop1h 20mSouthwest
Deal found 7/30$97
This Frontier deal was found by Cheapflights users on 8/1. 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.
dom. 8/3110:11 pmSFO - ONT
Nonstop1h 29mFrontier
dom. 9/710:13 pmONT - SFO
Nonstop1h 35mFrontier
Deal found 8/1$111
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/42:12 pmSJC - ONT
1 stop26h 08mFrontier
mié. 8/135:21 pmONT - SJC
1 stop18h 01mFrontier
Deal found 7/31$168
This American Airlines deal was found by Cheapflights users on 8/1. 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. 8/3012:59 pmSTS - ONT
1 stop4h 51mAmerican Airlines
dom. 8/319:00 amONT - STS
1 stop6h 47mAmerican Airlines
Deal found 8/1$199
This American Airlines deal was found by Cheapflights users on 8/1. 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. 8/236:00 amSJC - ONT
1 stop11h 52mAmerican Airlines
lun. 8/256:17 amONT - SJC
1 stop16h 08mAmerican Airlines
Deal found 8/1$233
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
mar. 9/169:39 amOAK - ONT
1 stop9h 08mHawaiian Airlines
mar. 9/2310:06 amONT - OAK
1 stop9h 12mHawaiian Airlines
Deal found 8/1$280
This Alaska Airlines deal was found by Cheapflights users on 8/1. 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. 9/168:00 amOAK - ONT
2 stops10h 47mAlaska Airlines
mar. 9/2310:06 amONT - OAK
1 stop9h 12mAlaska Airlines
Deal found 8/1$288
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/82:30 pmSTS - ONT
1 stop9h 33mAlaska Airlines
sáb. 10/116:00 amONT - STS
1 stop16h 06mAlaska Airlines
Deal found 7/30$302
This Hawaiian 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/2011:54 amSTS - ONT
1 stop5h 06mHawaiian Airlines
mar. 9/3010:06 amONT - STS
1 stop6h 08mHawaiian Airlines
Deal found 7/31$457

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 agosto 2, 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

sáb. 9/13

11:15 am-12:30 pm

Nonstop1h 15m

Ontario

lun. 9/15

7:55 pm-9:05 pm

Nonstop1h 10m

$97

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

jue. 9/11

7:10 pm-8:33 pm

Nonstop1h 23m

Ontario

lun. 9/15

6:50 pm-8:09 pm

Nonstop1h 19m

$97

OaklandOntario

OAK - ONT

OAKONT

Oakland

jue. 8/28

6:05 am-7:30 am

Nonstop1h 25m

Ontario

lun. 9/1

5:50 am-7:10 am

Nonstop1h 20m

$97

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

dom. 8/31

10:11 pm-11:40 pm

Nonstop1h 29m

Ontario

dom. 9/7

10:13 pm-11:48 pm

Nonstop1h 35m

$111

San JoseOntario

SJC - ONT

SJCONT

San Jose

lun. 9/29

12:25 pm-7:54 pm

1 stop7h 29m

Ontario

sáb. 10/4

8:59 pm-11:26 am

1 stop14h 27m

$168

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

sáb. 8/30

12:59 pm-5:50 pm

1 stop4h 51m

Ontario

dom. 8/31

9:00 am-3:47 pm

1 stop6h 47m

$199

San JoseOntario

SJC - ONT

SJCONT

San Jose

sáb. 8/23

6:00 am-5:52 pm

1 stop11h 52m

Ontario

lun. 8/25

6:17 am-10:25 pm

1 stop16h 08m

$233

OaklandOntario

OAK - ONT

OAKONT

Oakland

mar. 9/16

9:39 am-6:47 pm

1 stop9h 08m

Ontario

mar. 9/23

10:06 am-7:18 pm

1 stop9h 12m

$280

OaklandOntario

OAK - ONT

OAKONT

Oakland

mar. 9/16

8:00 am-6:47 pm

2 stops10h 47m

Ontario

mar. 9/23

10:06 am-7:18 pm

1 stop9h 12m

$288

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

mié. 10/8

2:30 pm-12:03 am

1 stop9h 33m

Ontario

sáb. 10/11

6:00 am-10:06 pm

1 stop16h 06m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 27 results
1
2
3

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 agosto 2, 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 agosto 2, 2025.

The most flights from zzXIH to ONT are scheduled on a Thursday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 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 agosto 2, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta 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
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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
7,983 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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
2,613 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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
8,904 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Food

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 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 71 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 $49 on Southwest. Other airlines that offer cheap prices include United Airlines from $49 and Frontier from $54 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: United Airlines (80%), Air Canada (80%), Emirates( 79%).

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

    On average you can expect to pay $127 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 $95.

  • 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Francisco Bay Area to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Las Vegas flights
Burbank to Las Vegas flights
Los Angeles to San Jose flights
Los Angeles to San Francisco flights
Santa Ana to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Ontario flights
Santa Ana to San Francisco flights
San Francisco to Los Angeles flights
San Francisco to Las Vegas flights
Ontario to San Francisco flights
Santa Ana to Oakland flights
San Francisco to Santa Ana flights
Oakland to Las Vegas flights
Oakland to Santa Ana flights
Oakland to Los Angeles flights
San Jose to Las Vegas flights
Ontario to Las Vegas flights
Los Angeles to Oakland flights
Burbank to Oakland flights
San Francisco to San Diego flights
San Jose to San Diego flights
San Diego to Las Vegas flights
Burbank to San Francisco flights
Sacramento to Los Angeles flights
Los Angeles to Reno flights
San Francisco to Burbank flights
Oakland to San Diego flights
San Diego to San Francisco flights
Santa Ana to San Jose flights
Los Angeles to Sacramento flights
San Jose to Santa Ana flights
Sacramento to Las Vegas flights
Oakland to Burbank flights
San Diego to San Jose flights
Burbank to San Jose flights
Sacramento to San Diego flights
San Francisco to Long Beach flights
San Jose to Ontario flights
Fresno to Las Vegas flights
Las Vegas to Los Angeles flights
Stockton to Las Vegas flights
Sacramento to Santa Ana flights
Las Vegas to Santa Ana flights
San Diego to Oakland flights
San Francisco to Palm Springs flights
Las Vegas to Burbank flights
Santa Rosa to Las Vegas flights
San Jose to Burbank flights
Long Beach to San Francisco flights

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 agosto 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$24Average$84FlexibilityNo cancel feeOn-time65%
FrontierCheapest$27Average$102FlexibilityNo cancel feeOn-time62%
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$58Average$185FlexibilityNo cancel feeOn-time69%
DeltaCheapest$58Average$180FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$255FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$145Average$273FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$252FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.