$63+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
May 30 — Jun 61
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 April 30, 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 April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/30. 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.
Mon 6/17:36 pm
SAN
- ONT
1 stop20h 08m
Frontier
Mon 6/88:17 pm
ONT
- SAN
1 stop27h 58m
Frontier
Deal found 4/30![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/236:25 am
SAN
- ONT
1 stop17h 24m
Frontier
Sat 5/308:59 am
ONT
- SAN
1 stop14h 45m
Frontier
Deal found 4/25![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 6/49:43 am
SAN
- ONT
1 stop5h 26m
Frontier
Sat 6/63:30 pm
ONT
- SAN
1 stop17h 17m
Frontier
Deal found 4/26![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:53 pm
SAN
- ONT
1 stop22h 00m
Frontier
Mon 8/1711:43 am
ONT
- SAN
1 stop7h 48m
Frontier
Deal found 4/27![Frontier logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 5/129:59 pm
SAN
- ONT
1 stop17h 45m
Frontier
Sat 5/1610:50 am
ONT
- SAN
1 stop21h 52m
Frontier
Deal found 4/26![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:53 pm
SAN
- ONT
1 stop22h 00m
Frontier
Tue 8/183:34 pm
ONT
- SAN
1 stop5h 24m
Frontier
Deal found 4/27![Frontier logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:53 pm
SAN
- ONT
1 stop17h 14m
Frontier
Mon 8/1711:43 am
ONT
- SAN
1 stop7h 48m
Frontier
Deal found 4/27![Frontier logo]()
$285
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 April 30, 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 April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Mon 6/17:36 pm
SAN
- ONT
1 stop20h 08m
Frontier
Mon 6/83:30 pm
ONT
- SAN
1 stop17h 18m
Frontier
Deal found 4/28![Frontier logo]()
$140
This Alaska Airlines deal was found by Cheapflights users on 4/26. 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 6/212:12 pm
SAN
- ONT
1 stop6h 56m
Alaska Airlines
Tue 6/93:35 pm
ONT
- SAN
1 stop5h 52m
Alaska Airlines
Deal found 4/26![Alaska Airlines logo]()
$413
This United Airlines deal was found by Cheapflights users on 4/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/99:26 am
SAN
- ONT
1 stop13h 11m
United Airlines
Wed 6/101:50 pm
ONT
- SAN
1 stop18h 19m
United Airlines
Deal found 4/27![United Airlines logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Sun 5/109:59 pm
SAN
- ONT
2 stops12h 52m
Frontier
Thu 5/146:00 am
ONT
- SAN
1 stop26h 42m
Frontier
Deal found 4/25![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 8/49:53 pm
SAN
- ONT
1 stop17h 14m
Frontier
Thu 8/138:39 pm
ONT
- SAN
2 stops22h 52m
Frontier
Deal found 4/25![Frontier logo]()
$345
This Alaska Airlines deal was found by Cheapflights users on 4/26. 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 5/239:27 am
SAN
- ONT
1 stop9h 41m
Alaska Airlines
Sat 5/303:35 pm
ONT
- SAN
1 stop5h 52m
Alaska Airlines
Deal found 4/26![Alaska Airlines logo]()
$483
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 8/17:47 pm
SAN
- ONT
1 stop15h 10m
Frontier
Sat 8/83:40 pm
ONT
- SAN
2 stops8h 18m
Frontier
Deal found 4/25![Frontier logo]()
$405
Last-minute flights from San Diego to OntarioDiscover last-minute flight deals from San Diego to Ontario. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from San Diego to Ontario. Data last updated April 30, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 4/309:00 pm
SAN
- ONT
2 stops14h 22m
Frontier
Mon 5/48:59 pm
ONT
- SAN
1 stop21h 40m
Frontier
Deal found 4/25![Frontier logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 4/30. 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.
Sat 5/94:16 pm
SAN
- ONT
1 stop18h 35m
Frontier
Mon 5/118:17 pm
ONT
- SAN
2 stops24h 47m
Frontier
Deal found 4/30![Frontier logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Sat 5/94:16 pm
SAN
- ONT
1 stop18h 35m
Frontier
Sun 5/108:17 pm
ONT
- SAN
1 stop27h 25m
Frontier
Deal found 4/29![Frontier logo]()
$366
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Sun 5/109:59 pm
SAN
- ONT
2 stops12h 52m
Frontier
Thu 5/146:00 am
ONT
- SAN
1 stop26h 42m
Frontier
Deal found 4/25![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 5/129:59 pm
SAN
- ONT
1 stop17h 45m
Frontier
Sat 5/1610:50 am
ONT
- SAN
1 stop21h 52m
Frontier
Deal found 4/26![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/236:25 am
SAN
- ONT
1 stop17h 24m
Frontier
Sat 5/308:59 am
ONT
- SAN
1 stop14h 45m
Frontier
Deal found 4/25![Frontier logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2712:12 pm
SAN
- ONT
1 stop6h 56m
Alaska Airlines
Wed 6/33:35 pm
ONT
- SAN
1 stop5h 52m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$343
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 April 30, 2026.
Search for one-way flight options from San Diego to Ontario. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Wed 6/109:53 pm
SAN
- ONT
1 stop17h 15m
Frontier
Deal found 4/28![Frontier logo]()
$63
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:50 am
SAN
- ONT
1 stop8h 32m
American Airlines
Deal found 4/29![American Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Thu 7/98:29 pm
SAN
- ONT
1 stop23h 24m
Frontier
Deal found 4/29![Frontier logo]()
$152
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2712:12 pm
SAN
- ONT
1 stop6h 56m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:27 am
SAN
- ONT
1 stop9h 41m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$192
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:17 pm
SAN
- ONT
1 stop17h 53m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/237:30 pm
SAN
- ONT
1 stop15h 40m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/189:27 am
SAN
- ONT
1 stop9h 41m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$236
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:57 am
SAN
- ONT
1 stop7h 40m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$242
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 April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $140 (Kiwi.com) |
One-way from | $63 (Kiwi.com) |
Popular in | March |
Cheapest in | February |
Average price | $244 |
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 April 30, 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 6/1
7:36 pm-3:44 pm
1 stop20h 08m
Ontario
Mon 6/8
3:30 pm-8:48 am
1 stop17h 18m
$140
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sun 5/10
9:59 pm-10:51 am
2 stops12h 52m
Ontario
Thu 5/14
6:00 am-8:42 am
1 stop26h 42m
$288
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 8/4
9:53 pm-3:07 pm
1 stop17h 14m
Ontario
Thu 8/13
8:39 pm-7:31 pm
2 stops22h 52m
$345
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 8/1
7:47 pm-10:57 am
1 stop15h 10m
Ontario
Sat 8/8
3:40 pm-11:58 pm
2 stops8h 18m
$405
Quickest round-trip
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 6/2
12:12 pm-7:08 pm
1 stop6h 56m
Ontario
Tue 6/9
3:35 pm-9:27 pm
1 stop5h 52m
$413
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 6/9
9:26 am-10:37 pm
1 stop13h 11m
Ontario
Wed 6/10
1:50 pm-8:09 am
1 stop18h 19m
$428
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 5/23
9:27 am-7:08 pm
1 stop9h 41m
Ontario
Sat 5/30
3:35 pm-9:27 pm
1 stop5h 52m
$483
Cheapest one-way
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 6/24
8:24 am-6:03 pm
1 stop9h 39m
$244
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 6/10
8:24 am-6:03 pm
1 stop9h 39m
$244
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 5/26
9:27 am-7:08 pm
1 stop9h 41m
$247
Showing 1-10 of 15 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 April.
| 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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