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Ontario

$163+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
Jul 16 — Jul 231
Thu 7/16
Thu 7/23
1 adult, Economy
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Cheap 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 June 16, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/15. 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.
Tue 7/143:03 pm
SAN
-
ONT
1 stop17h 00m
Frontier
Wed 7/151:38 pm
ONT
-
SAN
2 stops10h 26m
Frontier
Deal found 6/15$193
This Kiwi.com deal was found by Cheapflights users on 6/15. 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.
Wed 7/153:03 pm
SAN
-
ONT
1 stop17h 00m
Frontier
Mon 7/208:58 am
ONT
-
SAN
1 stop15h 06m
Frontier
Deal found 6/15$246
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Wed 7/159:41 am
SAN
-
ONT
1 stop8h 37m
American Airlines
Mon 7/207:15 pm
ONT
-
SAN
1 stop13h 36m
American Airlines
Deal found 6/14$251
This American Airlines deal was found by Cheapflights users on 6/13. 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 9/269:46 am
SAN
-
ONT
1 stop8h 31m
American Airlines
Wed 9/306:15 am
ONT
-
SAN
1 stop9h 07m
American Airlines
Deal found 6/13$272
This Kiwi.com deal was found by Cheapflights users on 6/13. 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.
Sat 9/264:36 pm
SAN
-
ONT
1 stop21h 24m
Frontier
Wed 9/302:58 pm
ONT
-
SAN
2 stops18h 04m
Frontier
Deal found 6/13$306
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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.
Tue 9/17:57 am
SAN
-
ONT
1 stop7h 50m
Alaska Airlines
Wed 9/24:27 pm
ONT
-
SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/15$315
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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.
Fri 9/259:59 pm
SAN
-
ONT
1 stop17h 48m
Alaska Airlines
Mon 9/284:27 pm
ONT
-
SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/15$344

Find 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 June 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$193
(Kiwi.com)

One-way from

$163
(Priceline)

Popular in

March

Cheapest in

February

Average price

$264
Provider with most accurate pricing for San Diego-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Ontario flights.
Search Deals
From San Diego to Ontario
Search Deals
One-way flight from San Diego to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 June 16, 2026.
Use the filters below to find and compare flights from San Diego to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 7/14

3:03 pm-8:03 am

1 stop17h 00m

Ontario

Wed 7/15

1:38 pm-12:04 am

2 stops10h 26m

$193
Quickest round-trip

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 9/26

9:46 am-6:17 pm

1 stop8h 31m

Ontario

Wed 9/30

6:15 am-3:22 pm

1 stop9h 07m

$272

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 9/1

7:57 am-3:47 pm

1 stop7h 50m

Ontario

Wed 9/2

4:27 pm-8:05 am

1 stop15h 38m

$315

San DiegoOntario

SAN - ONT

SANONT

San Diego

Wed 7/15

7:46 pm-11:07 am

1 stop15h 21m

Ontario

Mon 7/20

3:40 pm-12:04 am

2 stops8h 24m

$336

San DiegoOntario

SAN - ONT

SANONT

San Diego

Fri 9/25

9:59 pm-3:47 pm

1 stop17h 48m

Ontario

Mon 9/28

4:27 pm-8:05 am

1 stop15h 38m

$344

San DiegoOntario

SAN - ONT

SANONT

San Diego

Tue 8/18

8:24 am-6:03 pm

1 stop9h 39m

Ontario

Wed 8/19

4:27 pm-8:05 am

1 stop15h 38m

$360

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 7/4

8:24 am-6:03 pm

1 stop9h 39m

Ontario

Sun 7/5

6:43 pm-8:15 am

1 stop13h 32m

$474

San DiegoOntario

SAN - ONT

SANONT

San Diego

Thu 7/2

8:29 pm-3:08 pm

1 stop18h 39m

Ontario

Sun 7/5

3:40 pm-8:06 pm

1 stop4h 26m

$486

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 6/27

8:24 am-6:03 pm

1 stop9h 39m

Ontario

Mon 6/29

6:43 pm-8:15 am

1 stop13h 32m

$507

San DiegoOntario

SAN - ONT

SANONT

San Diego

Sat 10/31

8:01 am-5:08 pm

1 stop9h 07m

Ontario

Sun 11/15

6:31 pm-8:20 am

1 stop13h 49m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/15

Showing 1-10 of 22 resultsSorted by cheapest first
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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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Diego-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

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 50m. 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.

See more FAQs

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