HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$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 3/20. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Mar 13 — Mar 201
Thu 3/13
Thu 3/20
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 March 8, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$57
(United Airlines)

One-way from

$39
(Cheapflightsfares)

Popular in

February

Cheapest in

September

Average price

$157
Provider with most accurate pricing for San Francisco-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Los Angeles flights.
Search Deals
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. 6% potential increase in price ($10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 8, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/158:34 amSFO - ONT
Nonstop1h 28mFrontier
Fri 5/168:24 amONT - SFO
Nonstop1h 38mFrontier
Deal found 3/6$78
This Trip.com deal was found by Cheapflights users on 3/6. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/285:51 pmSTS - ONT
Nonstop1h 27mAvelo Airlines
Mon 3/317:58 pmONT - STS
Nonstop1h 33mAvelo Airlines
Deal found 3/6$88
This United Airlines deal was found by Cheapflights users on 3/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/246:45 pmSFO - ONT
Nonstop1h 25mUnited Airlines
Sat 3/296:00 amONT - SFO
Nonstop1h 29mUnited Airlines
Deal found 3/7$91
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/36:35 amSJC - ONT
Nonstop1h 20mSouthwest
Thu 4/1010:40 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 3/6$97
This Frontier deal was found by Cheapflights users on 3/7. 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.
Wed 4/94:03 pmSJC - ONT
1 stop7h 56mFrontier
Tue 4/152:43 pmONT - SJC
1 stop3h 55mFrontier
Deal found 3/7$150
This Southwest deal was found by Cheapflights users on 3/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/104:15 pmSFO - ONT
2 stops7h 00mSouthwest
Wed 3/125:50 pmONT - SFO
1 stop5h 55mSouthwest
Deal found 3/6$192
This Southwest deal was found by Cheapflights users on 3/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:40 pmOAK - ONT
Nonstop1h 20mSouthwest
Fri 5/24:55 pmONT - OAK
Nonstop1h 15mSouthwest
Deal found 3/7$206
This Orbitz deal was found by Cheapflights users on 3/6. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/68:35 amSFO - ONT
Nonstop1h 28mMultiple Airlines
Tue 4/86:00 amONT - SFO
2 stops13h 26mMultiple Airlines
Deal found 3/6$216
This American Airlines deal was found by Cheapflights users on 3/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/127:50 amSFO - ONT
1 stop4h 09mAmerican Airlines
Mon 4/147:25 pmONT - SFO
1 stop4h 33mAmerican Airlines
Deal found 3/7$232
This American Airlines deal was found by Cheapflights users on 3/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2112:59 pmSTS - ONT
1 stop5h 34mAmerican Airlines
Mon 3/319:47 amONT - STS
1 stop6h 04mAmerican Airlines
Deal found 3/7$277
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/36:43 amOAK - ONT
1 stop17h 16mAlaska Airlines
Mon 4/76:55 amONT - OAK
1 stop25h 48mAlaska Airlines
Deal found 3/7$297
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/78:10 amSJC - ONT
1 stop15h 49mAlaska Airlines
Wed 4/95:44 pmONT - SJC
1 stop5h 04mAlaska Airlines
Deal found 3/6$332

Find flights from San Francisco Bay Area to Ontario within your budget

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 March 8, 2025.

Fly from

San Francisco Bay Area

Fly to

Ontario

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 3/20

8:16 am-9:44 am

Nonstop1h 28m

Ontario

Sun 3/23

8:26 am-10:02 am

Nonstop1h 36m

$68

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 3/28

5:51 pm-7:18 pm

Nonstop1h 27m

Ontario

Mon 3/31

7:58 pm-9:31 pm

Nonstop1h 33m

$88

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 3/24

6:45 pm-8:10 pm

Nonstop1h 25m

Ontario

Sat 3/29

6:00 am-7:29 am

Nonstop1h 29m

$91

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 4/3

6:35 am-7:55 am

Nonstop1h 20m

Ontario

Thu 4/10

10:40 am-11:55 am

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 4/9

4:03 pm-11:59 pm

1 stop7h 56m

Ontario

Tue 4/15

2:43 pm-6:38 pm

1 stop3h 55m

$150

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 3/10

4:15 pm-11:15 pm

2 stops7h 00m

Ontario

Wed 3/12

5:50 pm-11:45 pm

1 stop5h 55m

$192

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 5/1

8:40 pm-10:00 pm

Nonstop1h 20m

Ontario

Fri 5/2

4:55 pm-6:10 pm

Nonstop1h 15m

$206

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 4/6

8:35 am-10:03 am

Nonstop1h 28m

Ontario

Tue 4/8

6:00 am-7:26 pm

2 stops13h 26m

$216

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 4/12

7:50 am-11:59 am

1 stop4h 09m

Ontario

Mon 4/14

7:25 pm-11:58 pm

1 stop4h 33m

$232

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 3/21

12:59 pm-6:33 pm

1 stop5h 34m

Ontario

Mon 3/31

9:47 am-3:51 pm

1 stop6h 04m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 38 results
1
2
3
4

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.

Travel insights for flights from San Francisco Bay Area to Ontario

Get recent, data-driven insights about flights from San Francisco Bay Area to Ontario including ideal travel times, pricing trends, and more.

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 $313). 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 March 8, 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.

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 March 8, 2025.
To help decide which airline to fly from San Francisco Bay Area to Ontario, see what other customers have to say about Southwest, Alaska Airlines and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest
8.1
Very good
4,314 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Alaska Airlines
8.0
Very good
9,716 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta
8.0
Very good
8,024 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Hawaiian Airlines
7.9
Good
2,316 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Avelo Airlines
7.5
Good
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Food

7.1

Crew

8.7

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 108 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 $63 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%), United Airlines (91%), Frontier( 89%).

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

    On average you can expect to pay $235 for a flight from San Francisco Bay Area to Ontario. The cheapest flight overall is $19 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 $313). 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
San Francisco to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
Los Angeles to San Jose flights
Burbank to Las Vegas flights
Santa Ana to Las Vegas flights
Oakland to Los Angeles flights
San Jose to Las Vegas flights
Oakland to Las Vegas flights
Los Angeles to Oakland flights
Oakland to Santa Ana flights
San Francisco to Ontario flights
San Francisco to Santa Ana flights
Santa Ana to San Francisco flights
Ontario to San Francisco flights
Ontario to Las Vegas flights
Santa Ana to Oakland flights
Burbank to San Francisco flights
San Francisco to San Diego flights
San Jose to San Diego flights
San Francisco to Burbank flights
Oakland to Burbank flights
Sacramento to Los Angeles flights
Oakland to San Diego flights
San Diego to Las Vegas flights
San Diego to San Francisco flights
San Francisco to Palm Springs flights
Sacramento to Las Vegas flights
San Jose to Ontario flights
San Jose to Santa Ana flights
San Diego to San Jose flights
Burbank to Oakland flights
Las Vegas to Los Angeles flights
Los Angeles to Sacramento flights
Los Angeles to Reno flights
Sacramento to San Diego flights
Ontario to San Jose flights
Fresno to Las Vegas flights
Sacramento to Burbank flights
Las Vegas to Santa Ana flights
San Diego to Oakland flights
Stockton to Las Vegas flights
Santa Ana to San Jose flights
San Diego to Sacramento flights
Santa Ana to Sacramento flights
Las Vegas to Burbank flights
Sacramento to Santa Ana flights
Reno to Los Angeles flights

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 March 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$95FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$32Average$106FlexibilityNo cancel feeOn-time65%
DeltaCheapest$45Average$139FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$45Average$299FlexibilityNo cancel feeOn-time75%
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$78Average$114FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$105Average$251FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$159Average$275FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$232Average$307FlexibilityNo 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.