$167+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Apr 11 — Apr 181
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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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 Juan
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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 12, 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 12, 2026.
This Frontier deal was found by Cheapflights users on 3/8. 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 8/114:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Wed 8/196:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/8![Frontier logo]()
$276
This Frontier deal was found by Cheapflights users on 3/10. 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 8/114:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Sat 8/226:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/10![Frontier logo]()
$296
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Sun 4/265:10 am
ONT
- SJU
1 stop9h 28m
United Airlines
Tue 5/57:20 am
SJU
- ONT
2 stops16h 16m
United Airlines
Deal found 3/8![United Airlines logo]()
$314
This Frontier deal was found by Cheapflights users on 3/9. 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 8/154:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Sat 8/226:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/9![Frontier logo]()
$316
This American Airlines deal was found by Cheapflights users on 3/10. 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 4/284:52 pm
ONT
- SJU
2 stops13h 21m
American Airlines
Thu 5/711:59 pm
SJU
- ONT
1 stop13h 10m
American Airlines
Deal found 3/10![American Airlines logo]()
$334
This Frontier deal was found by Cheapflights users on 3/10. 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 8/154:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Wed 8/196:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/10![Frontier logo]()
$336
This United Airlines deal was found by Cheapflights users on 3/8. 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 4/227:40 am
SJU
- ONT
2 stops18h 05m
United Airlines
Deal found 3/8![United Airlines logo]()
$340
This Frontier deal was found by Cheapflights users on 3/9. 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 8/184:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Sun 8/236:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/9![Frontier logo]()
$351
This Delta deal was found by Cheapflights users on 3/9. 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 11/147:00 am
ONT
- SJU
1 stop12h 13m
Delta
Wed 11/181:55 pm
SJU
- ONT
1 stop12h 19m
Delta
Deal found 3/9![Delta logo]()
$353
This United Airlines deal was found by Cheapflights users on 3/9. 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 5/56:00 am
ONT
- SJU
1 stop11h 38m
United Airlines
Sat 5/97:40 am
SJU
- ONT
1 stop13h 21m
United Airlines
Deal found 3/9![United Airlines logo]()
$354
This Frontier deal was found by Cheapflights users on 3/9. 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.
Mon 7/274:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Wed 8/56:15 am
SJU
- ONT
1 stop12h 10m
Frontier
Deal found 3/9![Frontier logo]()
$356
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/286:00 am
ONT
- SJU
2 stops12h 24m
United Airlines
Wed 5/61:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/10![United Airlines logo]()
$359
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 12, 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 12, 2026.
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/286:00 am
ONT
- SJU
2 stops12h 24m
United Airlines
Wed 5/61:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/10![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 3/8. 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 5/19:55 pm
ONT
- SJU
1 stop9h 30m
Southwest
Fri 5/85:05 am
SJU
- ONT
2 stops13h 10m
Southwest
Deal found 3/8![Southwest logo]()
$429
This United Airlines deal was found by Cheapflights users on 3/7. 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 5/125:00 am
ONT
- SJU
1 stop9h 38m
United Airlines
Sat 5/167:40 am
SJU
- ONT
1 stop13h 21m
United Airlines
Deal found 3/7![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Sun 4/266:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Sat 5/97:40 am
SJU
- ONT
1 stop13h 21m
United Airlines
Deal found 3/9![United Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/295:10 am
ONT
- SJU
2 stops13h 14m
United Airlines
Wed 5/61:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/10![United Airlines logo]()
$501
This Southwest deal was found by Cheapflights users on 3/9. 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 7/178:45 pm
ONT
- SJU
2 stops11h 50m
Southwest
Tue 7/215:00 am
SJU
- ONT
1 stop10h 05m
Southwest
Deal found 3/9![Southwest logo]()
$656
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/287:00 am
ONT
- SJU
1 stop10h 34m
United Airlines
Mon 5/42:55 pm
SJU
- ONT
1 stop10h 03m
United Airlines
Deal found 3/10![United Airlines logo]()
$587
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Sun 4/266:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Sun 5/102:55 pm
SJU
- ONT
1 stop10h 03m
United Airlines
Deal found 3/9![United Airlines logo]()
$655
This United Airlines deal was found by Cheapflights users on 3/8. 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 7/131:50 pm
ONT
- SJU
2 stops12h 39m
United Airlines
Wed 7/221:40 pm
SJU
- ONT
1 stop10h 02m
United Airlines
Deal found 3/8![United Airlines logo]()
$665
This United Airlines deal was found by Cheapflights users on 3/9. 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
Wed 4/291:00 am
SJU
- ONT
2 stops24h 35m
United Airlines
Deal found 3/9![United Airlines logo]()
$669
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Sun 5/176:00 am
ONT
- SJU
1 stop11h 38m
United Airlines
Sun 5/241:40 pm
SJU
- ONT
1 stop10h 02m
United Airlines
Deal found 3/8![United Airlines logo]()
$696
Last-minute flights from Ontario to San JuanDiscover last-minute flight deals from Ontario to San Juan. Data last updated March 12, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Juan. Data last updated March 12, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/8. 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 4/75:18 pm
ONT
- SJU
1 stop14h 49m
Multiple Airlines
Tue 4/1411:00 am
SJU
- ONT
2 stops39h 55m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$407
This United Airlines deal was found by Cheapflights users on 3/8. 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 4/227:40 am
SJU
- ONT
2 stops18h 05m
United Airlines
Deal found 3/8![United Airlines logo]()
$340
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/246:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Sat 5/27:40 am
SJU
- ONT
1 stop13h 21m
United Airlines
Deal found 3/10![United Airlines logo]()
$402
This Delta deal was found by Cheapflights users on 3/7. 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 4/257:05 am
ONT
- SJU
1 stop13h 07m
Delta
Wed 5/612:55 pm
SJU
- ONT
1 stop11h 05m
Delta
Deal found 3/7![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 3/8. 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 4/256:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Tue 4/287:20 am
SJU
- ONT
2 stops16h 16m
United Airlines
Deal found 3/8![United Airlines logo]()
$382
This American Airlines deal was found by Cheapflights users on 3/8. 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 4/2512:19 pm
ONT
- SJU
2 stops13h 13m
American Airlines
Tue 4/286:45 am
SJU
- ONT
2 stops14h 39m
American Airlines
Deal found 3/8![American Airlines logo]()
$396
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Sun 4/265:10 am
ONT
- SJU
1 stop9h 28m
United Airlines
Tue 5/57:20 am
SJU
- ONT
2 stops16h 16m
United Airlines
Deal found 3/8![United Airlines logo]()
$314
This Southwest deal was found by Cheapflights users on 3/8. 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.
Sun 4/263:50 pm
ONT
- SJU
2 stops14h 20m
Southwest
Tue 5/55:35 am
SJU
- ONT
2 stops13h 45m
Southwest
Deal found 3/8![Southwest logo]()
$414
This American Airlines deal was found by Cheapflights users on 3/10. 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 4/284:52 pm
ONT
- SJU
2 stops13h 21m
American Airlines
Thu 5/711:59 pm
SJU
- ONT
1 stop13h 10m
American Airlines
Deal found 3/10![American Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 3/10. 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 4/286:00 am
ONT
- SJU
2 stops12h 24m
United Airlines
Wed 5/61:00 am
SJU
- ONT
2 stops14h 22m
United Airlines
Deal found 3/10![United Airlines logo]()
$359
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 12, 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 12, 2026.
This United Airlines deal was found by Cheapflights users on 3/11. 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 7/291:18 pm
ONT
- SJU
2 stops13h 11m
United Airlines
Deal found 3/11![United Airlines logo]()
$167
This Trip.com deal was found by Cheapflights users on 3/10. 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.
Tue 3/316:15 am
ONT
- SJU
2 stops16h 48m
Frontier
Deal found 3/10![Frontier logo]()
$170
This Super.com deal was found by Cheapflights users on 3/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/64:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Deal found 3/9![Frontier logo]()
$176
This CheapOair deal was found by Cheapflights users on 3/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/234:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Deal found 3/9![Frontier logo]()
$178
This Frontier deal was found by Cheapflights users on 3/10. 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 6/94:15 pm
ONT
- SJU
1 stop10h 38m
Frontier
Deal found 3/10![Frontier logo]()
$188
This Trip.com deal was found by Cheapflights users on 3/10. 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.
Tue 3/242:23 pm
ONT
- SJU
2 stops20h 46m
Frontier
Deal found 3/10![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 5/76:00 am
ONT
- SJU
2 stops43h 01m
Frontier
Deal found 3/11![Frontier logo]()
$195
This United Airlines deal was found by Cheapflights users on 3/7. 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 5/96:59 pm
ONT
- SJU
2 stops14h 35m
United Airlines
Deal found 3/7![United Airlines logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 5/88:06 pm
ONT
- SJU
2 stops23h 37m
Frontier
Deal found 3/11![Frontier logo]()
$203
This Southwest deal was found by Cheapflights users on 3/7. 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.
Wed 7/11:05 pm
ONT
- SJU
1 stop8h 40m
Southwest
Deal found 3/7![Southwest logo]()
$207
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 12, 2026.
Round-trip from | $276 (Frontier) |
|---|---|
One-way from | $167 (United Airlines) |
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 12, 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
Tue 4/28
6:00 am-9:24 pm
2 stops12h 24m
San Juan Luis Munoz Marin Intl
Wed 5/6
1:00 am-12:22 pm
2 stops14h 22m
$359
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Fri 5/1
9:55 pm-10:25 am
1 stop9h 30m
San Juan Luis Munoz Marin Intl
Fri 5/8
5:05 am-3:15 pm
2 stops13h 10m
$429
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Tue 5/12
5:00 am-5:38 pm
1 stop9h 38m
San Juan Luis Munoz Marin Intl
Sat 5/16
7:40 am-6:01 pm
1 stop13h 21m
$444
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sun 4/26
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Sat 5/9
7:40 am-6:01 pm
1 stop13h 21m
$464
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Wed 4/29
5:10 am-9:24 pm
2 stops13h 14m
San Juan Luis Munoz Marin Intl
Wed 5/6
1:00 am-12:22 pm
2 stops14h 22m
$501
Quickest round-trip
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Tue 4/28
7:00 am-8:34 pm
1 stop10h 34m
San Juan Luis Munoz Marin Intl
Mon 5/4
2:55 pm-9:58 pm
1 stop10h 03m
$587
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sun 4/26
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Sun 5/10
2:55 pm-9:58 pm
1 stop10h 03m
$655
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Fri 7/17
8:45 pm-11:35 am
2 stops11h 50m
San Juan Luis Munoz Marin Intl
Tue 7/21
5:00 am-12:05 pm
1 stop10h 05m
$656
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 7/13
1:50 pm-5:29 am
2 stops12h 39m
San Juan Luis Munoz Marin Intl
Wed 7/22
1:40 pm-8:42 pm
1 stop10h 02m
$665
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 4/27
6:49 pm-1:45 pm
2 stops15h 56m
San Juan Luis Munoz Marin Intl
Wed 4/29
1:00 am-10:35 pm
2 stops24h 35m
$669
Showing 1-10 of 20 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 6, 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.
How much does it cost to fly round-trip from Ontario to San Juan?
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 12, 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
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
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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Search flights from Ontario to San Juan by cabin class
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Ontario and San Juan flights
Browse other Ontario and San Juan flight options. Last updated on March 12, 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 12, 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$73 | Average$467 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$292 | Average$597 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$321 | Average$549 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$365 | Average$602 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$445 | Average$570 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$455 | Average$467 | FlexibilityNo cancel fee | On-time62% |