$70+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
Aug 12 — Aug 191
Round-trip
1 adult, Economy
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Find cheap flights from San Diego 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
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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 Diego to Ontario
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Cheapest flights from San Diego to OntarioExplore 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 July 13, 2026.
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 July 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Tue 8/1810:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Mon 8/318:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Deal found 7/13![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Mon 8/108:51 pm
SAN
- ONT
2 stops39h 57m
Frontier
Mon 8/178:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/13![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/9. 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.
Thu 8/68:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Thu 8/138:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/9![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 7/11. 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 8/88:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Sat 8/158:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/11![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 10/74:36 pm
SAN
- ONT
1 stop21h 24m
Frontier
Sat 10/102:58 pm
ONT
- SAN
1 stop18h 22m
Frontier
Deal found 7/9![Frontier logo]()
$211
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Fri 8/2810:00 am
SAN
- ONT
1 stop25h 02m
Frontier
Fri 9/43:40 pm
ONT
- SAN
1 stop4h 34m
Frontier
Deal found 7/13![Frontier logo]()
$220
Best flights from San Diego to OntarioDiscover carefully curated flight deals from San Diego to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 13, 2026.
Discover carefully curated flight deals from San Diego to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Mon 8/108:51 pm
SAN
- ONT
2 stops39h 57m
Frontier
Mon 8/178:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/13![Frontier logo]()
$154
This Booking.com deal was found by Cheapflights users on 7/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/107:57 am
SAN
- ONT
1 stop7h 50m
Alaska Airlines
Fri 9/114:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Deal found 7/13![Alaska Airlines logo]()
$273
This Southwest deal was found by Cheapflights users on 7/9. 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.
Wed 10/73:50 pm
SAN
- ONT
2 stops5h 30m
Southwest
Sat 10/107:20 am
ONT
- SAN
2 stops4h 55m
Southwest
Deal found 7/9![Southwest logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 7/11. 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 8/1810:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Mon 8/3110:17 pm
ONT
- SAN
2 stops16h 33m
Frontier
Deal found 7/11![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Fri 8/2810:00 am
SAN
- ONT
1 stop25h 02m
Frontier
Fri 9/43:40 pm
ONT
- SAN
1 stop4h 34m
Frontier
Deal found 7/13![Frontier logo]()
$220
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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 9/239:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Sat 9/266:02 am
ONT
- SAN
1 stop7h 19m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$313
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Fri 8/77:45 pm
SAN
- ONT
1 stop15h 17m
Frontier
Sun 8/98:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/13![Frontier logo]()
$304
Last-minute flights from San Diego to OntarioDiscover last-minute flight deals from San Diego to Ontario. Data last updated July 13, 2026 and is based on user searches.
Discover last-minute flight deals from San Diego to Ontario. Data last updated July 13, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/9. 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.
Thu 8/68:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Thu 8/138:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/9![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 7/11. 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 8/88:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Sat 8/158:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/11![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Mon 8/108:51 pm
SAN
- ONT
2 stops39h 57m
Frontier
Mon 8/178:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Deal found 7/13![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Tue 8/1810:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Mon 8/318:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Deal found 7/13![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Fri 8/2810:00 am
SAN
- ONT
1 stop25h 02m
Frontier
Fri 9/43:40 pm
ONT
- SAN
1 stop4h 34m
Frontier
Deal found 7/13![Frontier logo]()
$220
One-way flights from San Diego to OntarioSearch for one-way flight options from San Diego to Ontario. Find affordable one-way fares based on user searches. Data last updated July 13, 2026.
Search for one-way flight options from San Diego to Ontario. Find affordable one-way fares based on user searches. Data last updated July 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/11. 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 8/2510:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Deal found 7/11![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Mon 8/108:51 pm
SAN
- ONT
2 stops39h 57m
Frontier
Deal found 7/13![Frontier logo]()
$102
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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.
Sat 10/39:58 pm
SAN
- ONT
1 stop19h 10m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$147
This Alaska Airlines deal was found by Cheapflights users on 7/10. 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.
Sat 10/179:58 pm
SAN
- ONT
1 stop19h 10m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 7/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/89:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 7/13![Alaska Airlines logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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 11/37:54 am
SAN
- ONT
1 stop8h 38m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$174
This Alaska Airlines deal was found by Cheapflights users on 7/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:58 pm
SAN
- ONT
1 stop19h 10m
Alaska Airlines
Deal found 7/13![Alaska Airlines logo]()
$178
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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 11/118:38 pm
SAN
- ONT
1 stop19h 54m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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 11/188:38 pm
SAN
- ONT
1 stop19h 54m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 7/12. 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.
Sat 11/148:38 pm
SAN
- ONT
1 stop19h 54m
Alaska Airlines
Deal found 7/12![Alaska Airlines logo]()
$186
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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 9/149:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$187
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 July 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $122 (Kiwi.com) |
One-way from | $70 (Kiwi.com) |
Popular in | March |
Cheapest in | February |
Average price | $299 |
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 July 13, 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
Cheapest round-trip
San DiegoOntario
SAN - ONT
SANONT
San Diego
Mon 8/10
8:51 pm-12:48 pm
2 stops39h 57m
Ontario
Mon 8/17
8:58 am-11:59 pm
1 stop15h 01m
$154
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 8/18
10:00 am-2:03 pm
1 stop28h 03m
Ontario
Mon 8/31
10:17 pm-2:50 pm
2 stops16h 33m
$183
San DiegoOntario
SAN - ONT
SANONT
San Diego
Fri 8/28
10:00 am-11:02 am
1 stop25h 02m
Ontario
Fri 9/4
3:40 pm-8:14 pm
1 stop4h 34m
$220
San DiegoOntario
SAN - ONT
SANONT
San Diego
Thu 9/10
7:57 am-3:47 pm
1 stop7h 50m
Ontario
Fri 9/11
4:27 pm-8:05 am
1 stop15h 38m
$273
Quickest round-trip
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 10/7
3:50 pm-9:20 pm
2 stops5h 30m
Ontario
Sat 10/10
7:20 am-12:15 pm
2 stops4h 55m
$301
San DiegoOntario
SAN - ONT
SANONT
San Diego
Fri 8/7
7:45 pm-11:02 am
1 stop15h 17m
Ontario
Sun 8/9
8:58 am-11:59 pm
1 stop15h 01m
$304
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 9/23
9:59 pm-3:47 pm
1 stop17h 48m
Ontario
Sat 9/26
6:02 am-1:21 pm
1 stop7h 19m
$313
Cheapest one-way
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 11/14
8:38 pm-4:32 pm
1 stop19h 54m
$154
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 10/24
9:58 pm-5:08 pm
1 stop19h 10m
$154
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 9/8
9:59 pm-3:47 pm
1 stop17h 48m
$167
Showing 1-10 of 18 resultsSorted by cheapest first
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 July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
SAN-ONT
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.
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