$114+ Cheap flights from Ontario to San Diego (ONT - SAN)
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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAN
Jul 27 — Aug 31
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to San Diego 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 Ontario to San Diego
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to San DiegoExplore the most affordable flight options available from Ontario to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 27, 2026.
Explore the most affordable flight options available from Ontario to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/118:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Tue 8/1810:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Deal found 6/24![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/248:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Fri 8/2810:00 am
SAN
- ONT
1 stop25h 02m
Frontier
Deal found 6/24![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/248:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Thu 8/273:45 pm
SAN
- ONT
1 stop8h 10m
Frontier
Deal found 6/24![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 8/48:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Sat 8/156:25 am
SAN
- ONT
1 stop17h 25m
Frontier
Deal found 6/22![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 6/25. 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.
Fri 8/288:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Mon 8/3110:00 am
SAN
- ONT
1 stop28h 03m
Frontier
Deal found 6/25![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/238:48 am
ONT
- SAN
1 stop6h 02m
Frontier
Thu 8/273:45 pm
SAN
- ONT
1 stop8h 10m
Frontier
Deal found 6/24![Frontier logo]()
$271
This American Airlines deal was found by Cheapflights users on 6/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:59 pm
ONT
- SAN
1 stop29h 19m
American Airlines
Thu 8/2710:57 am
SAN
- ONT
1 stop7h 18m
American Airlines
Deal found 6/27![American Airlines logo]()
$273
Best flights from Ontario to San DiegoDiscover carefully curated flight deals from Ontario to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 27, 2026.
Discover carefully curated flight deals from Ontario to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 27, 2026.
This American Airlines deal was found by Cheapflights users on 6/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:59 pm
ONT
- SAN
1 stop29h 19m
American Airlines
Thu 8/2710:57 am
SAN
- ONT
1 stop7h 18m
American Airlines
Deal found 6/25![American Airlines logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 6/25. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Wed 9/27:57 am
SAN
- ONT
1 stop7h 50m
Alaska Airlines
Deal found 6/25![Alaska Airlines logo]()
$323
This United Airlines deal was found by Cheapflights users on 6/27. 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 9/19:01 am
ONT
- SAN
1 stop13h 46m
United Airlines
Wed 9/29:49 am
SAN
- ONT
1 stop10h 12m
United Airlines
Deal found 6/27![United Airlines logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 6/26. 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.
Mon 8/244:27 pm
ONT
- SAN
1 stop19h 53m
Alaska Airlines
Fri 8/289:59 pm
SAN
- ONT
1 stop17h 53m
Alaska Airlines
Deal found 6/26![Alaska Airlines logo]()
$333
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 7/246:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Wed 7/298:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$373
This Booking.com deal was found by Cheapflights users on 6/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/113:14 pm
ONT
- SAN
1 stop8h 30m
Alaska Airlines
Sun 9/139:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 6/27![Alaska Airlines logo]()
$393
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 7/215:26 pm
ONT
- SAN
1 stop6h 30m
Alaska Airlines
Tue 7/288:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$443
This Booking.com deal was found by Cheapflights users on 6/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/246:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Mon 7/278:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/25![Alaska Airlines logo]()
$453
This Alaska Airlines deal was found by Cheapflights users on 6/24. 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 7/224:18 pm
ONT
- SAN
1 stop5h 04m
Alaska Airlines
Wed 7/298:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$453
Last-minute flights from Ontario to San DiegoDiscover last-minute flight deals from Ontario to San Diego. Data last updated June 27, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Diego. Data last updated June 27, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/168:58 am
ONT
- SAN
1 stop15h 06m
Frontier
Sun 7/198:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Deal found 6/22![Frontier logo]()
$370
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 7/206:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Mon 7/278:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$413
This Booking.com deal was found by Cheapflights users on 6/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Thu 7/238:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/25![Alaska Airlines logo]()
$448
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 7/215:26 pm
ONT
- SAN
1 stop6h 30m
Alaska Airlines
Tue 7/288:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$443
This Alaska Airlines deal was found by Cheapflights users on 6/24. 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 7/224:18 pm
ONT
- SAN
1 stop5h 04m
Alaska Airlines
Wed 7/298:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$453
This Alaska Airlines deal was found by Cheapflights users on 6/26. 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.
Thu 7/236:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Mon 7/278:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/26![Alaska Airlines logo]()
$468
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 7/246:43 pm
ONT
- SAN
1 stop13h 32m
Alaska Airlines
Wed 7/298:24 am
SAN
- ONT
1 stop9h 39m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$373
This American Airlines deal was found by Cheapflights users on 6/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:11 am
ONT
- SAN
1 stop9h 15m
American Airlines
Mon 7/276:20 am
SAN
- ONT
1 stop29h 42m
American Airlines
Deal found 6/25![American Airlines logo]()
$387
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/251:50 pm
ONT
- SAN
1 stop10h 41m
United Airlines
Mon 7/276:20 am
SAN
- ONT
3 stops16h 17m
United Airlines
Deal found 6/25![United Airlines logo]()
$455
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 7/3011:52 am
ONT
- SAN
1 stop8h 14m
Frontier
Sun 8/28:51 pm
SAN
- ONT
1 stop19h 03m
Frontier
Deal found 6/25![Frontier logo]()
$348
One-way flights from Ontario to San DiegoSearch for one-way flight options from Ontario to San Diego. Find affordable one-way fares based on user searches. Data last updated June 27, 2026.
Search for one-way flight options from Ontario to San Diego. Find affordable one-way fares based on user searches. Data last updated June 27, 2026.
This Trip.com deal was found by Cheapflights users on 6/24. 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 9/172:58 pm
ONT
- SAN
1 stop5h 50m
Frontier
Deal found 6/24![Frontier logo]()
$114
This Priceline deal was found by Cheapflights users on 6/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/154:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 9/84:27 pm
ONT
- SAN
1 stop19h 53m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$167
This Priceline deal was found by Cheapflights users on 6/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/274:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$172
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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.
Sun 8/304:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$177
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:00 am
ONT
- SAN
1 stop14h 53m
United Airlines
Deal found 6/25![United Airlines logo]()
$187
This Booking.com deal was found by Cheapflights users on 6/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Deal found 6/27![Alaska Airlines logo]()
$197
This Trip.com deal was found by Cheapflights users on 6/24. 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.
Sat 7/253:40 pm
ONT
- SAN
1 stop16h 24m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$199
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 8/176:43 pm
ONT
- SAN
1 stop18h 07m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$202
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 9/104:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 9/116:14 pm
ONT
- SAN
1 stop16h 16m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$211
Find flight deals from Ontario to San Diego
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Diego (SAN). 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 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $125 (Kiwi.com) |
One-way from | $114 (Trip.com) |
Popular in | January |
Cheapest in | February |
Average price | $239 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Diego 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 27, 2026.
Use the filters below to find and compare flights from Ontario to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Mon 8/24
12:59 pm-6:18 pm
1 stop29h 19m
San Diego
Thu 8/27
10:57 am-6:15 pm
1 stop7h 18m
$289
Quickest round-trip
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Tue 9/1
4:27 pm-8:36 pm
1 stop4h 09m
San Diego
Wed 9/2
7:57 am-3:47 pm
1 stop7h 50m
$323
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Mon 8/24
4:27 pm-12:20 pm
1 stop19h 53m
San Diego
Fri 8/28
9:59 pm-3:52 pm
1 stop17h 53m
$333
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Tue 9/1
9:01 am-10:47 pm
1 stop13h 46m
San Diego
Wed 9/2
9:49 am-8:01 pm
1 stop10h 12m
$363
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Fri 7/24
6:43 pm-8:15 am
1 stop13h 32m
San Diego
Wed 7/29
8:24 am-6:03 pm
1 stop9h 39m
$373
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Fri 9/11
3:14 pm-11:44 pm
1 stop8h 30m
San Diego
Sun 9/13
9:59 pm-3:47 pm
1 stop17h 48m
$393
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Tue 7/21
5:26 pm-11:56 pm
1 stop6h 30m
San Diego
Tue 7/28
8:24 am-6:03 pm
1 stop9h 39m
$443
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Fri 7/24
6:43 pm-8:15 am
1 stop13h 32m
San Diego
Mon 7/27
8:24 am-6:03 pm
1 stop9h 39m
$453
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Wed 7/22
4:18 pm-9:22 pm
1 stop5h 04m
San Diego
Wed 7/29
8:24 am-6:03 pm
1 stop9h 39m
$453
Cheapest one-way
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Sat 9/5
4:32 pm-8:05 am
1 stop15h 33m
$162
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Ontario to San Diego
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 Ontario to San Diego 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 Ontario-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Diego flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-San Diego 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 Ontario-San Diego 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 Ontario to San Diego
Have a flexible travel schedule? Discover the best time to fly to San Diego from Ontario with our price prediction graph.
ONT-SAN
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 Ontario to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsEl Cajon
National City
Chula Vista
Poway
Coronado
La Mesa
Santee
Julian
Lemon Grove
Browse thousands of different options on Cheapflights for your next trip
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