HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Francisco Bay Area

$34+ Cheap flights from Ontario (ONT) to San Francisco Bay Area

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 5/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Jan 28 — Feb 41
Tue 1/28
Tue 2/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Francisco Bay Area (zzXIH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 23, 2025.

Round-trip from

$38
(Cheapflightsfares)

One-way from

$34
(Cheapflightsfares)
From Ontario to San Francisco Bay Area
Search Deals
One-way flight from Ontario to San Francisco Bay Area
Search Deals

Find flight deals from Ontario to San Francisco Bay Area

Cheapest flights from Ontario to San Francisco Bay Area
Explore the most affordable flight options available from Ontario to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 1/23. 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.
Fri 2/288:26 amONT - SFO
Nonstop1h 36mFrontier
Sun 3/28:06 amSFO - ONT
Nonstop1h 28mFrontier
Deal found 1/23$48
This United Airlines deal was found by Cheapflights users on 1/22. 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 2/193:30 pmONT - SFO
Nonstop1h 42mUnited Airlines
Wed 2/267:45 amSFO - ONT
Nonstop1h 30mUnited Airlines
Deal found 1/22$57
This Trip.com deal was found by Cheapflights users on 1/22. 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 2/217:51 pmONT - STS
Nonstop1h 34mAvelo Airlines
Mon 2/245:45 pmSTS - ONT
Nonstop1h 26mAvelo Airlines
Deal found 1/22$74
This Frontier deal was found by Cheapflights users on 1/22. 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 3/32:43 pmONT - SJC
1 stop4h 29mFrontier
Wed 3/54:03 pmSJC - ONT
1 stop8h 03mFrontier
Deal found 1/22$100
This Southwest deal was found by Cheapflights users on 1/21. 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.
Tue 2/115:45 pmONT - SJC
Nonstop1h 20mSouthwest
Wed 2/122:10 pmSJC - ONT
Nonstop1h 20mSouthwest
Deal found 1/21$137
This Southwest deal was found by Cheapflights users on 1/22. 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.
Tue 4/2912:45 pmONT - SFO
2 stops9h 55mSouthwest
Thu 5/15:40 amSFO - ONT
1 stop4h 10mSouthwest
Deal found 1/22$142
This Travelocity deal was found by Cheapflights users on 1/22. 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.
Fri 3/148:26 amONT - SFO
Nonstop1h 36mMultiple Airlines
Mon 3/179:00 amSFO - ONT
2 stops14h 24mMultiple Airlines
Deal found 1/22$196
This Southwest deal was found by Cheapflights users on 1/22. 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 2/139:05 amONT - OAK
Nonstop1h 25mSouthwest
Mon 2/178:45 amOAK - ONT
Nonstop1h 25mSouthwest
Deal found 1/22$197
This American Airlines deal was found by Cheapflights users on 1/22. 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 2/16:10 amONT - SFO
1 stop6h 13mAmerican Airlines
Mon 2/39:15 amSFO - ONT
1 stop6h 14mAmerican Airlines
Deal found 1/22$199
This Orbitz deal was found by Cheapflights users on 1/22. 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.
Fri 3/1410:44 amONT - SJC
1 stop6h 17mMultiple Airlines
Mon 3/178:44 amSJC - ONT
2 stops14h 40mMultiple Airlines
Deal found 1/22$217
This American Airlines deal was found by Cheapflights users on 1/23. 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.
Tue 3/410:05 amONT - STS
1 stop5h 45mAmerican Airlines
Sat 3/812:54 pmSTS - ONT
1 stop5h 42mAmerican Airlines
Deal found 1/23$257
This Alaska Airlines deal was found by Cheapflights users on 1/22. 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 2/511:14 amONT - OAK
1 stop21h 35mAlaska Airlines
Wed 2/1210:41 amOAK - ONT
1 stop13h 17mAlaska Airlines
Deal found 1/22$272

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

Customize your flight search to find flights from Ontario to San Francisco Bay Area 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 January 23, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 2/28

8:26 am-10:02 am

Nonstop1h 36m

San Francisco

Sun 3/2

8:06 am-9:34 am

Nonstop1h 28m

$48

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 2/19

3:30 pm-5:12 pm

Nonstop1h 42m

San Francisco

Wed 2/26

7:45 am-9:15 am

Nonstop1h 30m

$57

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 2/21

7:51 pm-9:25 pm

Nonstop1h 34m

Santa Rosa Sonoma County

Mon 2/24

5:45 pm-7:11 pm

Nonstop1h 26m

$74

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 3/3

2:43 pm-7:12 pm

1 stop4h 29m

San Jose

Wed 3/5

4:03 pm-12:06 am

1 stop8h 03m

$100

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 2/11

8:30 am-9:50 am

Nonstop1h 20m

San Jose

Tue 2/11

2:10 pm-3:30 pm

Nonstop1h 20m

$137

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 4/29

12:45 pm-10:40 pm

2 stops9h 55m

San Francisco

Thu 5/1

5:40 am-9:50 am

1 stop4h 10m

$142

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 3/14

8:26 am-10:02 am

Nonstop1h 36m

San Francisco

Mon 3/17

11:11 am-11:24 pm

2 stops12h 13m

$196

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 2/13

8:50 pm-10:20 pm

Nonstop1h 30m

Oakland

Mon 2/17

9:05 pm-10:30 pm

Nonstop1h 25m

$197

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 3/14

10:44 am-5:01 pm

1 stop6h 17m

San Jose

Mon 3/17

8:44 am-11:24 pm

2 stops14h 40m

$217

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 3/4

10:05 am-3:50 pm

1 stop5h 45m

Santa Rosa Sonoma County

Sat 3/8

12:54 pm-6:36 pm

1 stop5h 42m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 32 results
1
2
3
4

Best time to book a flight from Ontario to San Francisco Bay Area

Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area from Ontario 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 Ontario to San Francisco Bay Area

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

What is the cheapest month to book a flight from Ontario to San Francisco Bay Area?

Currently, January is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $276). Flying from Ontario to San Francisco Bay Area in June is currently the most expensive (average of $404). 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 ONT to XIH?

Find hourly flight availability from Ontario to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 23, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to San Francisco Bay Area as you normally would.

Weekly flight availability from Ontario to San Francisco Bay Area

Explore weekly flight availability from Ontario to San Francisco Bay Area. 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 January 23, 2025.

The most flights from ONT to zzXIH are scheduled on a Monday (9 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).

Rainfall in San Francisco Bay Area by month

Plan your trip to San Francisco Bay Area by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco Bay Area ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco Bay Area when rainfall is around 0.0 in.

Temperature in San Francisco Bay Area by month

Plan your trip to San Francisco Bay Area by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco Bay Area, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Francisco Bay Area

Get insights into the airlines that provide service to San Francisco Bay Area. 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 San Francisco Bay Area. Reviews last updated January 23, 2025.
Read reviews from past customers who have flown Frontier, United Airlines and Southwest from Ontario to San Francisco Bay Area. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,647 reviews
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,699 reviews
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,508 reviews
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Avelo Airlines
7.5
Good
74 reviews
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
8,971 reviews
Southwest
8.1
Very good
4,647 reviews

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Francisco Bay Area. 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 from for flights from Ontario to San Francisco Bay Area?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to San Francisco Bay Area.

  • How popular is this Ontario to San Francisco Bay Area flight route?

    Within the past month, 186 users have taken a look at flights from Ontario to San Francisco Bay Area.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $34. United Airlines flights start at $59 while deals on Southwest start at $74 one-way.

  • What are the most popular routes from Ontario to San Francisco Bay Area?

    The most popular route from Ontario to San Francisco Bay Area is Ontario - San Francisco. You may also consider Ontario - San Jose or Ontario - Oakland.

  • What are the most reliable airlines from Ontario to San Francisco Bay Area?

    Consider Air Canada (72%), SkyWest Airlines (70%) or Copa Airlines (69%) when booking your flight. These represent the most reliable airlines when flying from Ontario to San Francisco Bay Area.

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

    The cheapest flight price from Ontario to San Francisco Bay Area is $26. On average you can expect to pay $736. The most popular route, (Ontario - San Francisco), can usually be booked for $38.

  • Can I find deals for flights from Ontario to San Francisco Bay Area that include hotel bookings?

    Yes. In addition to deals on Ontario to San Francisco Bay Area flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to San Francisco Bay Area?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to San Francisco Bay Area.

  • Can I find deals for business class flights from Ontario to San Francisco Bay Area?

    Yes. Cheapflights offers flight deals from Ontario to San Francisco Bay Area 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 Ontario to San Francisco Bay Area?

    Currently, January is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $276). Flying from Ontario to San Francisco Bay Area in June is currently the most expensive (average of $404). 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 Ontario to San Francisco Bay Area

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

Top 9 airlines flying from Ontario to San Francisco Bay Area

Discover the top 9 airlines that operate flights from Ontario to San Francisco Bay Area. 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 January 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$84FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$93FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$45Average$316FlexibilityNo cancel feeOn-time75%
DeltaCheapest$50Average$206FlexibilityNo cancel feeOn-timeN/A
Avelo AirlinesCheapest$67Average$88FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$73Average$138FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$116Average$256FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$179Average$274FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$232Average$449FlexibilityNo 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.