Cheap flight from Ontario to San Diego from $38
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Flights from Ontario to San Diego
Cheap flight deals from Ontario to San Diego
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
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ONT 6:00 AM3h 53m1 stopsSAN 9:53 AMOntario - San Diego | Wed, May 7 | United Airlines
SAN 2:55 PM5h 19m1 stopsSIN 8:14 PMSan Diego - Ontario | Tue, May 13 | Hawaiian Airlines$233 $34432% OFF32% OFF$344 $233 -
ONT 5:55 PM6h 4m1 stopsSAN 11:59 PMOntario - San Diego | Sat, Jun 7 | Alaska Airlines
SAN 8:10 AM3h 48m1 stopsSIN 11:58 AMSan Diego - Ontario | Sat, Jun 14 | Alaska Airlines$234 $34432% OFF32% OFF$344 $234 -
ONT 6:00 AM3h 53m1 stopsSAN 9:53 AMOntario - San Diego | Mon, May 5 | United Airlines
SAN 6:33 AM5h 37m1 stopsSIN 12:10 PMSan Diego - Ontario | Sat, May 10 | Hawaiian Airlines$258 $34425% OFF25% OFF$344 $258
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ONT 6:00 AM3h 53m1 stopsSAN 9:53 AMOntario - San Diego | Wed, May 14 | United Airlines
SAN 6:15 AM5h 45m1 stopsSIN 12:00 PMSan Diego - Ontario | Wed, May 21 | Alaska Airlines$25825% OFF$344 $258
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ONT 4:29 PM6h 15m1 stopsSAN 10:44 PMOntario - San Diego | Mon, May 12 | Alaska Airlines
SAN 8:55 AM3h 39m1 stopsSIN 12:34 PMSan Diego - Ontario | Wed, May 14 | Alaska Airlines$26623% OFF$344 $266
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ONT 1:45 PM4h 48m1 stopsSAN 6:33 PMOntario - San Diego | Wed, May 21 | United Airlines
SAN 6:15 AM5h 45m1 stopsSIN 12:00 PMSan Diego - Ontario | Wed, May 28 | Hawaiian Airlines$28118% OFF$344 $281
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ONT 6:00 AM4h 15m1 stopsSAN 10:15 AMOntario - San Diego | Wed, May 28 | United Airlines
SAN 10:15 PM9h 19m1 stopsSIN 7:34 AMSan Diego - Ontario | Wed, May 28 | Hawaiian Airlines$28118% OFF$344 $281
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ONT 6:41 PM4h 4m1 stopsSAN 10:45 PMOntario - San Diego | Wed, Jun 4 | United Airlines
SAN 10:55 AM4h 6m1 stopsSIN 3:01 PMSan Diego - Ontario | Wed, Jun 11 | Alaska Airlines$28318% OFF$344 $283
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ONT 6:00 AM3h 53m1 stopsSAN 9:53 AMOntario - San Diego | Tue, May 13 | United Airlines
SAN 6:15 AM5h 55m1 stopsSIN 12:10 PMSan Diego - Ontario | Wed, May 14 | Alaska Airlines$28418% OFF$344 $284
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ONT 1:45 PM4h 48m1 stopsSAN 6:33 PMOntario - San Diego | Tue, May 6 | United Airlines
SAN 2:55 PM4h 12m1 stopsSIN 7:07 PMSan Diego - Ontario | Tue, May 13 | Alaska Airlines$28617% OFF$344 $286
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ONT 1:00 PM17h 25m1 stopsSAN Invalid DateOntario - San Diego | Mon, May 5 | Normal Airline
SAN 3:00 PM6hNonstopONT 4:00 PMSan Diego - Ontario | Wed, May 7 | Normal AirlineFind More FlightsFind More Flights
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ONT 10:44 AM13h 14m1 stopsSAN 11:58 PMOntario - San Diego | Wed, May 7 | Frontier Airlines$38 $8354% OFF54% OFF$83 $38 -
ONT 7:00 AM4h 57m1 stopsSAN 11:57 AMOntario - San Diego | Tue, Jun 10 | Frontier Airlines$55 $8333% OFF33% OFF$83 $55
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ONT 6:00 AM5h 55m1 stopsSAN 11:55 AMOntario - San Diego | Mon, Jun 2 | Frontier Airlines$59 $8328% OFF28% OFF$83 $59
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ONT 6:00 AM12h 16m1 stopsSAN 6:16 PMOntario - San Diego | Mon, Jun 9 | Frontier Airlines$6226% OFF$83 $62
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ONT 2:28 PM9h 30m1 stopsSAN 11:58 PMOntario - San Diego | Mon, May 12 | Frontier Airlines$6225% OFF$83 $62
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ONT 2:28 PM9h 30m1 stopsSAN 11:58 PMOntario - San Diego | Mon, May 5 | Frontier Airlines$6423% OFF$83 $64
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ONT 6:00 AM5h 56m1 stopsSAN 11:56 AMOntario - San Diego | Sat, May 24 | Frontier Airlines$6422% OFF$83 $64
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ONT 1:08 PM10h 11m1 stopsSAN 11:19 PMOntario - San Diego | Tue, May 6 | Frontier Airlines$6422% OFF$83 $64
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ONT 1:08 PM10h 40m1 stopsSAN 11:48 PMOntario - San Diego | Wed, May 21 | Frontier Airlines$6719% OFF$83 $67
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ONT 10:44 AM13h 14m1 stopsSAN 11:58 PMOntario - San Diego | Tue, May 13 | Frontier Airlines$6917% OFF$83 $69
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ONT 1:00 PM17h 25m1 stopsSAN Invalid DateOntario - San Diego | Mon, May 5 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
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Frequently Asked Questions
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When are flight tickets from Ontario (ONT) to San Diego (SAN) the cheapest?
Airlines adjust prices for flights from Ontario to San Diego based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much do flights from Ontario (ONT) to San Diego (SAN) cost?
According to Trip.com's data, the lowest price is around $348.
How to find a cheap flight from Ontario to San Diego
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to San Diego. Book your flights at the right time and save more.
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Check One-way Fares
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Flying during the week, early in the morning, or late at night can help save money.
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Flight Info | Ontario to San Diego
| Cheapest one-way flight price | $37 |
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| Cheapest round-trip ticket price | $335 |
| Off-season for travel | September |
| Peak season for travel | December |
| Flight distance | 12,520.52 km |
| Popular airline | United Airlines |