$65+ 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
Jul 4 — Jul 111
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 June 4, 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 June 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/19:46 am
SAN
- ONT
1 stop5h 22m
Frontier
Wed 7/158:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/1![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/19:46 am
SAN
- ONT
1 stop10h 05m
Frontier
Wed 7/83:40 pm
ONT
- SAN
2 stops23h 47m
Frontier
Deal found 6/3![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 6/2. 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 8/76:25 am
SAN
- ONT
1 stop27h 39m
Frontier
Sun 8/1611:52 am
ONT
- SAN
1 stop8h 14m
Frontier
Deal found 6/2![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/157:46 pm
SAN
- ONT
1 stop15h 21m
Frontier
Mon 7/208:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/3![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 5/30. 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 6/209:43 am
SAN
- ONT
1 stop10h 08m
Frontier
Wed 6/243:34 pm
ONT
- SAN
2 stops23h 58m
Frontier
Deal found 5/30![Frontier logo]()
$250
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 June 4, 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 June 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/19:46 am
SAN
- ONT
1 stop5h 22m
Frontier
Wed 7/158:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/1![Frontier logo]()
$126
This Alaska Airlines deal was found by Cheapflights users on 6/1. 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 8/297:57 am
SAN
- ONT
1 stop7h 55m
Alaska Airlines
Fri 9/44:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 6/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:00 am
SAN
- ONT
1 stop10h 17m
Delta
Fri 10/1611:55 am
ONT
- SAN
1 stop10h 54m
Delta
Deal found 6/3![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 6/3. 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 9/89:35 am
SAN
- ONT
1 stop10h 26m
United Airlines
Wed 9/96:00 am
ONT
- SAN
1 stop12h 35m
United Airlines
Deal found 6/3![United Airlines logo]()
$403
This Kiwi.com deal was found by Cheapflights users on 6/2. 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 8/76:25 am
SAN
- ONT
1 stop27h 39m
Frontier
Sun 8/1611:52 am
ONT
- SAN
1 stop8h 14m
Frontier
Deal found 6/2![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/157:46 pm
SAN
- ONT
1 stop15h 21m
Frontier
Mon 7/208:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/3![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 5/30. 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 6/209:43 am
SAN
- ONT
1 stop10h 08m
Frontier
Wed 6/243:34 pm
ONT
- SAN
2 stops23h 58m
Frontier
Deal found 5/30![Frontier logo]()
$250
This Alaska Airlines deal was found by Cheapflights users on 6/2. 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 9/49:59 pm
SAN
- ONT
1 stop17h 53m
Alaska Airlines
Mon 9/74:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/2![Alaska Airlines logo]()
$393
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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.
Thu 9/37:57 am
SAN
- ONT
1 stop7h 50m
Alaska Airlines
Fri 9/44:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 6/2. 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 7/177:46 pm
SAN
- ONT
1 stop15h 21m
Frontier
Sun 7/198:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/2![Frontier logo]()
$332
Last-minute flights from San Diego to OntarioDiscover last-minute flight deals from San Diego to Ontario. Data last updated June 4, 2026 and is based on user searches.
Discover last-minute flight deals from San Diego to Ontario. Data last updated June 4, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 5/30. 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 6/209:43 am
SAN
- ONT
1 stop10h 08m
Frontier
Wed 6/243:34 pm
ONT
- SAN
2 stops23h 58m
Frontier
Deal found 5/30![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/19:46 am
SAN
- ONT
1 stop5h 22m
Frontier
Wed 7/158:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/1![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/19:46 am
SAN
- ONT
1 stop10h 05m
Frontier
Wed 7/83:40 pm
ONT
- SAN
2 stops23h 47m
Frontier
Deal found 6/3![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/157:46 pm
SAN
- ONT
1 stop15h 21m
Frontier
Mon 7/208:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/3![Frontier logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 7/167:46 pm
SAN
- ONT
1 stop15h 21m
Frontier
Mon 7/208:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Deal found 6/3![Frontier logo]()
$265
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 June 4, 2026.
Search for one-way flight options from San Diego to Ontario. Find affordable one-way fares based on user searches. Data last updated June 4, 2026.
This Trip.com deal was found by Cheapflights users on 5/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/19:46 am
SAN
- ONT
1 stop5h 22m
Frontier
Deal found 5/30![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 6/1. 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.
Mon 7/68:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Deal found 6/1![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 5/31. 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 10/146:25 am
SAN
- ONT
1 stop17h 30m
Frontier
Deal found 5/31![Frontier logo]()
$98
This Trip.com deal was found by Cheapflights users on 6/3. 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.
Fri 7/178:51 pm
SAN
- ONT
1 stop18h 23m
Frontier
Deal found 6/3![Frontier logo]()
$150
This Trip.com deal was found by Cheapflights users on 6/2. 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.
Fri 7/248:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Deal found 6/2![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 6/2. 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 6/239:43 am
SAN
- ONT
2 stops27h 05m
Frontier
Deal found 6/2![Frontier logo]()
$157
This Trip.com deal was found by Cheapflights users on 5/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/58:51 pm
SAN
- ONT
1 stop19h 03m
Frontier
Deal found 5/30![Frontier logo]()
$162
This Trip.com deal was found by Cheapflights users on 5/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/128:51 pm
SAN
- ONT
1 stop19h 03m
Frontier
Deal found 5/30![Frontier logo]()
$165
This Alaska Airlines deal was found by Cheapflights users on 5/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/59:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 5/30![Alaska Airlines logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 6/1. 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 8/218:33 pm
SAN
- ONT
1 stop14h 31m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$200
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 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $126 (Kiwi.com) |
One-way from | $65 (Trip.com) |
Popular in | March |
Cheapest in | February |
Average price | $249 |
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 4, 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
Quickest round-trip
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 7/1
9:46 am-3:08 pm
1 stop5h 22m
Ontario
Wed 7/15
8:58 am-12:04 am
1 stop15h 06m
$126
San DiegoOntario
SAN - ONT
SANONT
San Diego
Fri 8/7
6:25 am-10:04 am
1 stop27h 39m
Ontario
Sun 8/16
11:52 am-8:06 pm
1 stop8h 14m
$204
San DiegoOntario
SAN - ONT
SANONT
San Diego
Wed 7/15
7:46 pm-11:07 am
1 stop15h 21m
Ontario
Mon 7/20
8:58 am-12:04 am
1 stop15h 06m
$212
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 6/20
9:43 am-7:51 pm
1 stop10h 08m
Ontario
Wed 6/24
3:34 pm-3:32 pm
2 stops23h 58m
$250
San DiegoOntario
SAN - ONT
SANONT
San Diego
Fri 7/17
7:46 pm-11:07 am
1 stop15h 21m
Ontario
Sun 7/19
8:58 am-12:04 am
1 stop15h 06m
$332
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 8/29
7:57 am-3:52 pm
1 stop7h 55m
Ontario
Fri 9/4
4:27 pm-8:05 am
1 stop15h 38m
$373
San DiegoOntario
SAN - ONT
SANONT
San Diego
Fri 9/4
9:59 pm-3:52 pm
1 stop17h 53m
Ontario
Mon 9/7
4:27 pm-8:05 am
1 stop15h 38m
$393
San DiegoOntario
SAN - ONT
SANONT
San Diego
Thu 9/3
7:57 am-3:47 pm
1 stop7h 50m
Ontario
Fri 9/4
4:27 pm-8:05 am
1 stop15h 38m
$398
San DiegoOntario
SAN - ONT
SANONT
San Diego
Sat 10/10
7:00 am-5:17 pm
1 stop10h 17m
Ontario
Fri 10/16
11:55 am-10:49 pm
1 stop10h 54m
$399
San DiegoOntario
SAN - ONT
SANONT
San Diego
Tue 9/8
9:35 am-8:01 pm
1 stop10h 26m
Ontario
Wed 9/9
6:00 am-6:35 pm
1 stop12h 35m
$403
Showing 1-10 of 22 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 June.
| 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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