$174+ Cheap flights from Ontario (ONT) to San Juan
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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Apr 23 — Apr 301
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to San Juan 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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Cheapest flights from Ontario to San JuanExplore the most affordable flight options available from Ontario to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 24, 2026.
Explore the most affordable flight options available from Ontario to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 24, 2026.
This United Airlines deal was found by Cheapflights users on 3/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:30 pm
ONT
- SJU
2 stops14h 27m
United Airlines
Tue 10/277:10 am
SJU
- ONT
2 stops16h 10m
United Airlines
Deal found 3/23![United Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am
ONT
- SJU
1 stop10h 00m
United Airlines
Wed 11/182:25 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Deal found 3/22![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 3/20. 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 4/1810:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Fri 4/2412:55 pm
SJU
- ONT
1 stop11h 05m
Delta
Deal found 3/20![Delta logo]()
$388
This American Airlines deal was found by Cheapflights users on 3/20. 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.
Fri 5/110:26 pm
ONT
- SJU
1 stop19h 25m
American Airlines
Wed 5/67:25 am
SJU
- ONT
1 stop16h 42m
American Airlines
Deal found 3/20![American Airlines logo]()
$402
This Frontier deal was found by Cheapflights users on 3/18. 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.
Tue 8/44:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Wed 8/126:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/18![Frontier logo]()
$406
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:00 am
ONT
- SJU
2 stops13h 50m
United Airlines
Thu 4/301:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/22![United Airlines logo]()
$411
This United Airlines deal was found by Cheapflights users on 3/21. 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.
Wed 4/156:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Thu 4/161:00 am
SJU
- ONT
2 stops14h 20m
United Airlines
Deal found 3/21![United Airlines logo]()
$415
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:45 pm
ONT
- SJU
2 stops14h 49m
United Airlines
Tue 4/281:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 3/22![United Airlines logo]()
$428
This American Airlines deal was found by Cheapflights users on 3/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/184:52 pm
ONT
- SJU
2 stops13h 21m
American Airlines
Fri 5/2212:44 am
SJU
- ONT
1 stop11h 47m
American Airlines
Deal found 3/22![American Airlines logo]()
$442
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:00 am
ONT
- SJU
1 stop10h 00m
United Airlines
Wed 11/42:25 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Deal found 3/22![United Airlines logo]()
$444
This Southwest deal was found by Cheapflights users on 3/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/89:55 pm
ONT
- SJU
1 stop9h 30m
Southwest
Fri 5/155:05 am
SJU
- ONT
2 stops13h 10m
Southwest
Deal found 3/20![Southwest logo]()
$446
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 4/298:05 am
ONT
- SJU
1 stop12h 05m
Multiple Airlines
Mon 5/46:30 am
SJU
- ONT
2 stops44h 19m
Multiple Airlines
Deal found 3/21![Multiple Airlines logo]()
$448
Best flights from Ontario to San JuanDiscover carefully curated flight deals from Ontario to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 24, 2026.
Discover carefully curated flight deals from Ontario to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 24, 2026.
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:49 pm
ONT
- SJU
2 stops15h 56m
United Airlines
Thu 4/301:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/22![United Airlines logo]()
$478
This Delta deal was found by Cheapflights users on 3/20. 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.
Fri 4/1710:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Fri 4/2412:55 pm
SJU
- ONT
1 stop11h 05m
Delta
Deal found 3/20![Delta logo]()
$604
This United Airlines deal was found by Cheapflights users on 3/20. 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.
Mon 4/276:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Wed 4/291:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/20![United Airlines logo]()
$512
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Mon 4/205:10 am
ONT
- SJU
1 stop9h 28m
United Airlines
Fri 4/247:00 am
SJU
- ONT
2 stops18h 45m
United Airlines
Deal found 3/18![United Airlines logo]()
$524
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/315:10 am
ONT
- SJU
2 stops12h 28m
United Airlines
Tue 4/72:55 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Deal found 3/22![United Airlines logo]()
$590
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Mon 4/205:10 am
ONT
- SJU
1 stop9h 28m
United Airlines
Wed 4/291:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 3/19![United Airlines logo]()
$591
This United Airlines deal was found by Cheapflights users on 3/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Sat 4/181:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 3/23![United Airlines logo]()
$595
This United Airlines deal was found by Cheapflights users on 3/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/15:10 am
ONT
- SJU
1 stop9h 28m
United Airlines
Wed 4/87:00 am
SJU
- ONT
2 stops16h 36m
United Airlines
Deal found 3/23![United Airlines logo]()
$665
This United Airlines deal was found by Cheapflights users on 3/20. 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 4/45:10 am
ONT
- SJU
2 stops12h 28m
United Airlines
Wed 4/87:00 am
SJU
- ONT
2 stops16h 36m
United Airlines
Deal found 3/20![United Airlines logo]()
$723
This United Airlines deal was found by Cheapflights users on 3/20. 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.
Mon 4/67:00 am
ONT
- SJU
1 stop10h 34m
United Airlines
Wed 4/82:55 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Deal found 3/20![United Airlines logo]()
$746
Last-minute flights from Ontario to San JuanDiscover last-minute flight deals from Ontario to San Juan. Data last updated March 24, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Juan. Data last updated March 24, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 3/21. 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.
Wed 4/156:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Thu 4/161:00 am
SJU
- ONT
2 stops14h 20m
United Airlines
Deal found 3/21![United Airlines logo]()
$415
This Delta deal was found by Cheapflights users on 3/20. 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 4/1810:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Fri 4/2412:55 pm
SJU
- ONT
1 stop11h 05m
Delta
Deal found 3/20![Delta logo]()
$388
This Delta deal was found by Cheapflights users on 3/20. 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.
Sun 4/1910:15 pm
ONT
- SJU
1 stop12h 10m
Delta
Fri 4/2412:55 pm
SJU
- ONT
1 stop11h 05m
Delta
Deal found 3/20![Delta logo]()
$446
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 4/218:15 am
ONT
- SJU
1 stop11h 55m
Multiple Airlines
Sun 4/261:59 am
SJU
- ONT
2 stops48h 56m
Multiple Airlines
Deal found 3/21![Multiple Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:45 pm
ONT
- SJU
2 stops14h 49m
United Airlines
Tue 4/281:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 3/22![United Airlines logo]()
$428
This American Airlines deal was found by Cheapflights users on 3/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2411:59 pm
ONT
- SJU
1 stop11h 43m
American Airlines
Tue 4/287:25 am
SJU
- ONT
1 stop16h 02m
American Airlines
Deal found 3/22![American Airlines logo]()
$477
This American Airlines deal was found by Cheapflights users on 3/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:00 am
ONT
- SJU
1 stop14h 02m
American Airlines
Fri 5/17:25 am
SJU
- ONT
1 stop16h 42m
American Airlines
Deal found 3/22![American Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 3/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:00 am
ONT
- SJU
2 stops13h 50m
United Airlines
Thu 4/301:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/22![United Airlines logo]()
$411
This American Airlines deal was found by Cheapflights users on 3/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2810:26 pm
ONT
- SJU
1 stop19h 25m
American Airlines
Tue 5/57:25 am
SJU
- ONT
2 stops13h 59m
American Airlines
Deal found 3/23![American Airlines logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 4/298:05 am
ONT
- SJU
1 stop12h 05m
Multiple Airlines
Mon 5/46:30 am
SJU
- ONT
2 stops44h 19m
Multiple Airlines
Deal found 3/21![Multiple Airlines logo]()
$448
One-way flights from Ontario to San JuanSearch for one-way flight options from Ontario to San Juan. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
Search for one-way flight options from Ontario to San Juan. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
This Trip.com deal was found by Cheapflights users on 3/19. 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 4/1811:44 am
ONT
- SJU
2 stops27h 23m
Frontier
Deal found 3/19![Frontier logo]()
$174
This Delta deal was found by Cheapflights users on 3/19. 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 4/1810:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Deal found 3/19![Delta logo]()
$177
This Delta deal was found by Cheapflights users on 3/19. 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.
Tue 4/2110:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Deal found 3/19![Delta logo]()
$211
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/2212:59 am
ONT
- SJU
3 stops20h 59m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$218
This Delta deal was found by Cheapflights users on 3/19. 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.
Mon 4/2010:15 pm
ONT
- SJU
1 stop10h 30m
Delta
Deal found 3/19![Delta logo]()
$222
This Frontier deal was found by Cheapflights users on 3/18. 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.
Wed 6/174:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Deal found 3/18![Frontier logo]()
$223
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Fri 4/1710:26 pm
ONT
- SJU
1 stop19h 25m
American Airlines
Deal found 3/19![American Airlines logo]()
$229
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Wed 4/226:15 am
ONT
- SJU
2 stops19h 17m
American Airlines
Deal found 3/19![American Airlines logo]()
$234
This Delta deal was found by Cheapflights users on 3/21. 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.
Fri 4/1010:25 pm
ONT
- SJU
1 stop9h 25m
Delta
Deal found 3/21![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Thu 4/237:00 am
ONT
- SJU
1 stop10h 34m
United Airlines
Deal found 3/19![United Airlines logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 5/235:59 pm
ONT
- SJU
2 stops52h 32m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$254
Find flight deals from Ontario to San Juan
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Juan (PR1). 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 March 24, 2026.
Round-trip from | $354 (American Airlines) |
|---|---|
One-way from | $174 (Trip.com) |
Popular in | December |
Cheapest in | October |
Average price | $585 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Juan 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 March 24, 2026.
Use the filters below to find and compare flights from Ontario to San Juan that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/27
6:49 pm-1:45 pm
2 stops15h 56m
San Juan Luis Munoz Marin Intl
Thu 4/30
1:00 am-12:22 pm
2 stops14h 22m
$478
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/27
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Wed 4/29
1:00 am-12:22 pm
2 stops14h 22m
$512
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/20
5:10 am-5:38 pm
1 stop9h 28m
San Juan Luis Munoz Marin Intl
Fri 4/24
7:00 am-10:45 pm
2 stops18h 45m
$524
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Tue 3/31
5:10 am-8:38 pm
2 stops12h 28m
San Juan Luis Munoz Marin Intl
Tue 4/7
2:55 pm-9:50 pm
1 stop9h 55m
$590
Quickest round-trip
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/20
5:10 am-5:38 pm
1 stop9h 28m
San Juan Luis Munoz Marin Intl
Wed 4/29
1:40 pm-8:36 pm
1 stop9h 56m
$591
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Tue 4/14
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Sat 4/18
1:40 pm-8:36 pm
1 stop9h 56m
$595
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Fri 4/17
10:15 pm-11:45 am
1 stop10h 30m
San Juan Luis Munoz Marin Intl
Fri 4/24
12:55 pm-9:00 pm
1 stop11h 05m
$604
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Wed 4/1
5:10 am-5:38 pm
1 stop9h 28m
San Juan Luis Munoz Marin Intl
Wed 4/8
7:00 am-8:36 pm
2 stops16h 36m
$665
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sat 4/4
5:10 am-8:38 pm
2 stops12h 28m
San Juan Luis Munoz Marin Intl
Wed 4/8
7:00 am-8:36 pm
2 stops16h 36m
$723
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/6
7:00 am-8:34 pm
1 stop10h 34m
San Juan Luis Munoz Marin Intl
Wed 4/8
2:55 pm-9:50 pm
1 stop9h 55m
$746
Showing 1-10 of 22 resultsSorted by cheapest first
Best time to book a flight from Ontario to San Juan
Have a flexible travel schedule? Discover the best time to fly to San Juan from Ontario with our price prediction graph.
ONT-PR1
ONT-SJU
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.
Cheapflights Insights
Everything you need to know about your flight from Ontario to San Juan
ONT-PR1
ONT-SJU
How far ahead should I book a flight from Ontario to San Juan?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Juan. Price data was last updated on March 13, 2026.
To ensure you get the cheapest price possible for a flight from Ontario to San Juan, you should look to book at least 24 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Ontario to San Juan?
Currently, April is the cheapest month in which you can book a flight from Ontario to San Juan (average of $141). Flying from Ontario to San Juan in February is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Reviews of airlines servicing San Juan
Get insights into the airlines that provide service to San Juan. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Juan. Reviews last updated March 24, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to San Juan. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to San Juan. 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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Alternative routes for Ontario to San Juan
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Complete your trip
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Ontario and San Juan flights
Browse other Ontario and San Juan flight options. Last updated on March 24, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on March 24, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from Ontario to San Juan
Discover the top 6 airlines that operate flights from Ontario to San Juan. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$467 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$292 | Average$597 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$321 | Average$551 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$365 | Average$577 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$445 | Average$560 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$455 | Average$492 | FlexibilityNo cancel fee | On-time62% |