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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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:03 pmSFO - ONT
Nonstop1h 26mFrontier
Wed 12/106:15 amONT - SFO
1 stop10h 36mFrontier
Deal found 10/30$82
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:00 amSFO - ONT
1 stop15h 17mFrontier
Mon 12/810:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 10/30$83
This Frontier deal was found by Cheapflights users on 10/28. 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.
Thu 12/46:00 amSFO - ONT
1 stop8h 04mFrontier
Thu 12/410:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 10/28$84
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1310:11 pmSFO - ONT
Nonstop1h 29mFrontier
Sat 11/1512:05 pmONT - SFO
1 stop21h 28mFrontier
Deal found 10/30$86
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Mon 11/1010:21 pmSFO - ONT
Nonstop1h 29mFrontier
Wed 11/128:00 amONT - SFO
1 stop13h 22mFrontier
Deal found 10/28$87
This Priceline deal was found by Cheapflights users on 10/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1010:21 pmSFO - ONT
Nonstop1h 29mFrontier
Thu 11/1310:42 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 10/30$88
This CheapOair deal was found by Cheapflights users on 10/27. 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.
Mon 11/1010:21 pmSFO - ONT
Nonstop1h 29mFrontier
Sat 11/1512:05 pmONT - SFO
1 stop21h 28mFrontier
Deal found 10/27$89
This CheapOair deal was found by Cheapflights users on 10/29. 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.
Sun 11/1610:11 pmSFO - ONT
Nonstop1h 29mFrontier
Wed 11/198:45 amONT - SFO
1 stop23h 23mFrontier
Deal found 10/29$90
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Mon 12/810:03 pmSFO - ONT
Nonstop1h 28mFrontier
Sun 12/1410:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 10/28$91
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2210:03 pmSFO - ONT
Nonstop1h 28mFrontier
Fri 12/510:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 10/30$92
This Frontier deal was found by Cheapflights users on 10/28. 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 11/910:11 pmSFO - ONT
Nonstop1h 29mFrontier
Thu 11/1310:42 pmONT - SFO
Nonstop1h 29mFrontier
Deal found 10/28$93
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:03 pmSFO - ONT
Nonstop1h 26mFrontier
Tue 12/166:15 amONT - SFO
1 stop10h 36mFrontier
Deal found 10/30$94

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 October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$82
(CheapOair)

One-way from

$39
(United Airlines)

Popular in

April

Cheapest in

January

Average price

$155
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 ($11 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 30, 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

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 4/9

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Mon 4/13

1:30 pm-3:01 pm

Nonstop1h 31m

$135

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/17

11:15 am-12:37 pm

Nonstop1h 22m

Ontario

Tue 11/18

1:40 pm-3:04 pm

Nonstop1h 24m

$157

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 11/18

4:13 pm-5:34 pm

Nonstop1h 21m

Ontario

Wed 11/19

1:45 pm-3:09 pm

Nonstop1h 24m

$167

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 11/12

9:30 pm-10:51 pm

Nonstop1h 21m

Ontario

Thu 11/13

6:00 am-7:24 am

Nonstop1h 24m

$177

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 11/13

11:15 am-12:37 pm

Nonstop1h 22m

Ontario

Thu 11/13

6:38 pm-8:02 pm

Nonstop1h 24m

$177

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 11/12

9:30 pm-10:51 pm

Nonstop1h 21m

Ontario

Sat 11/15

6:00 am-7:24 am

Nonstop1h 24m

$177

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 12/4

9:25 am-3:20 pm

1 stop5h 55m

Ontario

Tue 12/9

12:35 pm-9:15 pm

2 stops8h 40m

$200

OaklandOntario

OAK - ONT

OAKONT

Oakland

Mon 12/29

6:10 am-7:30 am

Nonstop1h 20m

Ontario

Thu 1/1

10:15 am-11:35 am

Nonstop1h 20m

$204

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 12/10

3:15 pm-8:55 pm

2 stops5h 40m

Ontario

Thu 12/11

6:50 am-3:05 pm

2 stops8h 15m

$205

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 12/10

1:00 pm-6:15 pm

2 stops5h 15m

Ontario

Thu 12/11

5:55 am-10:10 am

1 stop4h 15m

$206

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 60 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, February is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $19). Flying from San Francisco Bay Area to Ontario in July is currently the most expensive (average of $57). 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 October 30, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 21% on flights from San Francisco Bay Area to Ontario by exploring options for tickets in the morning.

What is the cheapest day to fly from San Francisco Bay Area to Ontario?

Use this chart to determine the cheapest time to fly round-trip from San Francisco Bay Area to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Francisco Bay Area to Ontario flight should consider departing on Friday at noon when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 2025.
Read reviews from past customers who have flown Southwest, Avelo Airlines, and United Airlines 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.
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Avelo Airlines
7.5
Good
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,998 reviews
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,035 reviews
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,122 reviews
Southwest
8.0
Very good
4,243 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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

  • How long is the flight from San Francisco Bay Area to Ontario?

    A quick flight from San Francisco Bay Area to Ontario can take about 1h 20m. Alaska Airlines provides one of the quickest options available for as low as $204. Airlines will cover a distance of 361 mi. Generally, flights for this route are nonstop.

  • 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 United Airlines. Other airlines that offer cheap prices include Southwest from $75 and Alaska Airlines from $79 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: Air Canada (87%), Emirates (83%), United Airlines( 59%).

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

    On average you can expect to pay $136 for a flight from San Francisco Bay Area to Ontario. The cheapest flight overall is $38 while the most popular route, (San Francisco - Ontario) is currently priced at $69.

  • 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, February is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $19). Flying from San Francisco Bay Area to Ontario in July is currently the most expensive (average of $57). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$24Average$123FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$38Average$97FlexibilityNo cancel feeOn-time65%
Avelo AirlinesCheapest$55Average$79FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$58Average$181FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$59Average$268FlexibilityNo cancel feeOn-time75%
DeltaCheapest$98Average$194FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$116Average$274FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$260FlexibilityNo cancel feeOn-time71%

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