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$83+ Cheap flights from San Diego to Ontario (SAN - 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Cheap flight deals from San Diego to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Ontario (ONT). 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 octubre 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$173
(Kiwi.com)

One-way from

$83
(Kiwi.com)

Popular in

March

Cheapest in

July

Average price

$199
Provider with most accurate pricing for San Diego-Ontario flight deals.
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Provider most trusted by Cheapflights users for San Diego-Ontario flights.
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From San Diego to Ontario
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One-way flight from San Diego to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from San Diego to Ontario

Cheapest flights from San Diego to Ontario
Explore the most affordable flight options available from San Diego to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 30, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1312:17 pmSAN - ONT
1 stop11h 23mFrontier
lun. 11/1710:42 pmONT - SAN
2 stops45h 42mFrontier
Deal found 10/29$173
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/278:39 amSAN - ONT
2 stops29h 47mFrontier
jue. 12/46:15 amONT - SAN
1 stop9h 23mFrontier
Deal found 10/30$219
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/3112:12 pmSAN - ONT
1 stop11h 38mFrontier
sáb. 11/11:37 pmONT - SAN
1 stop23h 58mFrontier
Deal found 10/29$350
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/54:25 pmSAN - ONT
1 stop7h 04mAlaska Airlines
sáb. 12/612:13 pmONT - SAN
1 stop7h 20mAlaska Airlines
Deal found 10/28$359
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/58:00 amSAN - ONT
2 stops25h 10mFrontier
sáb. 11/81:37 pmONT - SAN
1 stop19h 49mFrontier
Deal found 10/28$379
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/121:55 pmSAN - ONT
1 stop6h 08mAlaska Airlines
lun. 12/226:05 pmONT - SAN
1 stop6h 02mAlaska Airlines
Deal found 10/29$398
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/109:54 amSAN - ONT
1 stop7h 40mUnited Airlines
mar. 11/111:40 pmONT - SAN
1 stop10h 33mUnited Airlines
Deal found 10/29$483
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/316:25 pmSAN - ONT
2 stops18h 12mFrontier
dom. 11/25:00 amONT - SAN
1 stop17h 48mFrontier
Deal found 10/29$487

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego 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 octubre 30, 2025.
Use the filters below to find and compare flights from San Diego to Ontario that are best for you.

Fly from

San Diego

Fly to

Ontario

Route

Depart

Return

Price

San DiegoOntario

SAN - ONT

SANONT

San Diego

jue. 11/13

12:17 pm-11:40 pm

1 stop11h 23m

Ontario

lun. 11/17

6:00 am-12:35 pm

1 stop6h 35m

$203

San DiegoOntario

SAN - ONT

SANONT

San Diego

jue. 11/27

8:39 am-2:26 pm

2 stops29h 47m

Ontario

jue. 12/4

6:15 am-3:38 pm

1 stop9h 23m

$219

San DiegoOntario

SAN - ONT

SANONT

San Diego

vie. 12/5

4:25 pm-11:29 pm

1 stop7h 04m

Ontario

sáb. 12/6

12:13 pm-7:33 pm

1 stop7h 20m

$359

San DiegoOntario

SAN - ONT

SANONT

San Diego

vie. 12/12

1:55 pm-8:03 pm

1 stop6h 08m

Ontario

lun. 12/22

6:05 pm-12:07 am

1 stop6h 02m

$398

San DiegoOntario

SAN - ONT

SANONT

San Diego

lun. 11/10

9:54 am-5:34 pm

1 stop7h 40m

Ontario

mar. 11/11

1:40 pm-12:13 am

1 stop10h 33m

$483

San DiegoOntario

SAN - ONT

SANONT

San Diego

dom. 11/9

7:58 am-10:51 pm

1 stop14h 53m

Ontario

mar. 11/11

6:38 pm-2:55 pm

1 stop20h 17m

$578

San DiegoOntario

SAN - ONT

SANONT

San Diego

vie. 11/21

6:30 am-12:03 pm

1 stop5h 33m

Ontario

dom. 11/23

4:47 pm-9:52 pm

1 stop5h 05m

$812

San DiegoOntario

SAN - ONT

SANONT

San Diego

jue. 11/27

2:18 pm-9:55 am

1 stop19h 37m

Ontario

mié. 12/3

12:42 am-2:13 pm

2 stops13h 31m

$988

San DiegoOntario

SAN - ONT

SANONT

San Diego

sáb. 2/21

9:10 am-5:42 pm

1 stop8h 32m

$161

San DiegoOntario

SAN - ONT

SANONT

San Diego

mar. 3/10

9:10 am-5:42 pm

1 stop8h 32m

$161

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 19 results
1
2

Compare providers for flights from San Diego to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Diego to Ontario in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Diego-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Diego-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Diego-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Diego-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Diego-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Diego to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San Diego 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 Diego to Ontario

What is the cheapest month to book a flight from San Diego to Ontario?

Currently, January is the cheapest month in which you can book a flight from San Diego to Ontario (average of $102). Flying from San Diego to Ontario in June is currently the most expensive (average of $179). 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 SAN to ONT?

Find hourly flight availability from San Diego 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 octubre 30, 2025.

It’s optimal to fly from San Diego to Ontario in the evening. By choosing this option you can save up to 21% on the cost of your flight, compared to a flight in the afternoon.

Related info for your journey

Find useful and relevant information for your journey from San Diego to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from San Diego to Ontario?

    Departing from San Diego to Ontario will take you 7h 04m. There are 94 mi between San Diego and Ontario. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

  • How can I find direct flights from San Diego to Ontario?

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

  • Can I find deals for business class flights from San Diego to Ontario?

    Yes. Cheapflights offers flight deals from San Diego 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 Diego to Ontario?

    Currently, January is the cheapest month in which you can book a flight from San Diego to Ontario (average of $102). Flying from San Diego to Ontario in June is currently the most expensive (average of $179). 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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