$46+ Cheap flights from San Diego to Ontario (SAN - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — ONT
Dec 3 — Dec 101
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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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Best
Last-minute
One-way
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 November 3, 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 November 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Tue 12/17:51 pm -
1 stop27h 07m
Tue 12/1511:00 am -
1 stop21h 02m
Deal found 10/29![Frontier logo]()
$89
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:50 am -
1 stop10h 46m
Fri 12/1810:48 pm -
1 stop13h 41m
Deal found 10/31![Frontier logo]()
$112
This Mytrip deal was found by Cheapflights users on 11/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:57 am -
1 stop9h 34m
Sat 12/128:44 am -
2 stops9h 32m
Deal found 11/1![Frontier logo]()
$113
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/39:05 am -
1 stop3h 55m
Sat 12/511:30 am -
1 stop12h 28m
Deal found 10/30![Frontier logo]()
$114
This Trip.com deal was found by Cheapflights users on 10/29. 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.
Thu 11/196:25 am -
2 stops13h 58m
Sun 11/2210:40 pm -
1 stop9h 15m
Deal found 10/29![Frontier logo]()
$152
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:29 pm -
2 stops15h 01m
Sun 11/2210:40 pm -
1 stop9h 15m
Deal found 10/31![Frontier logo]()
$156
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 November 3, 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 November 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Tue 12/17:51 pm -
1 stop27h 07m
Tue 12/1511:00 am -
1 stop21h 02m
Deal found 10/29![Frontier logo]()
$89
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:50 am -
1 stop10h 46m
Fri 12/1810:48 pm -
1 stop13h 41m
Deal found 10/31![Frontier logo]()
$112
This Mytrip deal was found by Cheapflights users on 11/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:57 am -
1 stop9h 34m
Sat 12/128:44 am -
2 stops9h 32m
Deal found 11/1![Frontier logo]()
$113
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1211:14 am -
1 stop11h 03m
Sun 12/1311:30 am -
1 stop12h 28m
Deal found 10/29![Frontier logo]()
$152
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:29 pm -
2 stops15h 01m
Sun 11/2210:40 pm -
1 stop9h 15m
Deal found 10/31![Frontier logo]()
$156
This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/308:37 pm -
1 stop10h 30m
Thu 2/118:02 am -
2 stops6h 36m
Deal found 10/29![Frontier logo]()
$214
Last-minute flights from San Diego to OntarioDiscover last-minute flight deals from San Diego to Ontario. Data last updated November 3, 2026 and is based on user searches.
Discover last-minute flight deals from San Diego to Ontario. Data last updated November 3, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 10/29. 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.
Thu 11/196:25 am -
2 stops13h 58m
Sun 11/2210:40 pm -
1 stop9h 15m
Deal found 10/29![Frontier logo]()
$152
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:29 pm -
2 stops15h 01m
Sun 11/2210:40 pm -
1 stop9h 15m
Deal found 10/31![Frontier logo]()
$156
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:50 am -
1 stop10h 46m
Fri 12/1810:48 pm -
1 stop13h 41m
Deal found 10/31![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Tue 12/17:51 pm -
1 stop27h 07m
Tue 12/1511:00 am -
1 stop21h 02m
Deal found 10/29![Frontier logo]()
$89
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/39:05 am -
1 stop3h 55m
Sat 12/511:30 am -
1 stop12h 28m
Deal found 10/30![Frontier logo]()
$114
This Mytrip deal was found by Cheapflights users on 11/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:57 am -
1 stop9h 34m
Sat 12/128:44 am -
2 stops9h 32m
Deal found 11/1![Frontier logo]()
$113
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 November 3, 2026.
Search for one-way flight options from San Diego to Ontario. Find affordable one-way fares based on user searches. Data last updated November 3, 2026.
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/98:57 am -
1 stop9h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Frontier logo]()
$46
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:32 pm -
1 stop5h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Frontier logo]()
$52
This Frontier deal was found by Cheapflights users on 11/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/49:05 am -
1 stop3h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$57
This Booking.com deal was found by Cheapflights users on 11/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:57 am -
1 stop9h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$58
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/39:05 am -
1 stop3h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Frontier logo]()
$63
This Mytrip deal was found by Cheapflights users on 10/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/207:53 pm -
1 stop11h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/31![Frontier logo]()
$64
This Mytrip deal was found by Cheapflights users on 11/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/227:53 pm -
1 stop11h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$73
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 November 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $89 (Kiwi.com) |
One-way from | $46 (Mytrip) |
Popular in | March |
Cheapest in | December |
Average price | $279 |
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 7,457,451 searches. Data last updated November 3, 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 San Diego - ONT Ontario
SANONT
San Diego
Tue 12/8
8:57 am-6:31 pm
1 stop9h 34m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$58
Quickest round-trip
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Thu 12/3
9:05 am-1:00 pm
1 stop3h 55m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$63
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Sun 12/20
7:53 pm-7:07 am
1 stop11h 14m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$64
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Wed 12/9
9:58 am-6:31 pm
2 stops8h 33m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$66
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Mon 2/8
5:26 pm-12:05 am
1 stop6h 39m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$77
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Tue 12/1
7:51 pm-10:58 pm
1 stop27h 07m
Ontario
Tue 12/15
11:00 am-8:02 am
1 stop21h 02m
$89
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Fri 11/27
8:11 pm-12:24 am
1 stop4h 13m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$93
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Thu 11/26
8:50 am-7:36 pm
1 stop10h 46m
Ontario
Fri 12/18
10:48 pm-12:29 pm
1 stop13h 41m
$112
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Tue 12/8
8:57 am-6:31 pm
1 stop9h 34m
Ontario
Sat 12/12
8:44 am-6:16 pm
2 stops9h 32m
$113
San DiegoOntario
SAN San Diego - ONT Ontario
SANONT
San Diego
Sun 11/22
8:50 am-7:36 pm
1 stop10h 46m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$134
Showing 1-10 of 14 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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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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