$144+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJU
Mar 6 — Mar 131
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 February 4, 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 February 4, 2026.
This United Airlines deal was found by Cheapflights users on 2/1. 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 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
1 stop10h 34m
United Airlines
Sat 5/27:40 am
SJU
- ONT
1 stop13h 21m
United Airlines
Deal found 2/1![United Airlines logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:18 pm
ONT
- SJU
1 stop14h 49m
Multiple Airlines
Mon 4/139:10 pm
SJU
- ONT
2 stops29h 45m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 2/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/25:00 pm
ONT
- SJU
2 stops16h 01m
Delta
Fri 3/66:15 am
SJU
- ONT
1 stop9h 47m
Delta
Deal found 2/1![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:10 am
ONT
- SJU
2 stops13h 14m
United Airlines
Thu 5/71:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 2/3![United Airlines logo]()
$342
This United Airlines deal was found by Cheapflights users on 2/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:30 pm
ONT
- SJU
2 stops15h 04m
United Airlines
Fri 10/162:55 pm
SJU
- ONT
1 stop9h 26m
United Airlines
Deal found 2/1![United Airlines logo]()
$348
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/215:02 pm
ONT
- SJU
2 stops12h 58m
American Airlines
Wed 2/258:00 am
SJU
- ONT
2 stops12h 19m
American Airlines
Deal found 2/2![American Airlines logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/244:00 pm
ONT
- SJU
1 stop16h 07m
Multiple Airlines
Fri 4/36:55 pm
SJU
- ONT
2 stops27h 24m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$354
This American Airlines deal was found by Cheapflights users on 2/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/112:22 pm
ONT
- SJU
2 stops17h 38m
American Airlines
Tue 4/146:56 pm
SJU
- ONT
2 stops18h 13m
American Airlines
Deal found 2/1![American Airlines logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/22:06 pm
ONT
- SJU
1 stop17h 31m
Multiple Airlines
Sat 3/77:00 am
SJU
- ONT
2 stops20h 59m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$365
This American Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:59 pm
ONT
- SJU
1 stop11h 04m
American Airlines
Mon 9/217:05 pm
SJU
- ONT
2 stops17h 12m
American Airlines
Deal found 2/4![American Airlines logo]()
$371
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:53 pm
ONT
- SJU
2 stops15h 52m
United Airlines
Mon 9/282:55 pm
SJU
- ONT
1 stop9h 26m
United Airlines
Deal found 2/2![United Airlines logo]()
$373
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 February 4, 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 February 4, 2026.
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:10 am
ONT
- SJU
2 stops13h 14m
United Airlines
Thu 5/71:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 2/3![United Airlines logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:33 pm
ONT
- SJU
2 stops17h 35m
Multiple Airlines
Tue 4/286:49 pm
SJU
- ONT
1 stop28h 50m
Multiple Airlines
Deal found 2/4![Multiple Airlines logo]()
$394
This Southwest deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/159:55 pm
ONT
- SJU
1 stop12h 50m
Southwest
Tue 5/195:05 am
SJU
- ONT
1 stop14h 15m
Southwest
Deal found 2/2![Southwest logo]()
$397
This Delta deal was found by Cheapflights users on 1/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/165:00 pm
ONT
- SJU
2 stops16h 01m
Delta
Fri 2/206:15 am
SJU
- ONT
1 stop9h 47m
Delta
Deal found 1/31![Delta logo]()
$400
This JetBlue deal was found by Cheapflights users on 2/1. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1511:25 pm
ONT
- SJU
1 stop11h 04m
JetBlue
Sun 5/1712:00 pm
SJU
- ONT
1 stop13h 09m
JetBlue
Deal found 2/1![JetBlue logo]()
$441
This American Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/17:05 pm
ONT
- SJU
2 stops10h 55m
American Airlines
Thu 3/52:23 pm
SJU
- ONT
2 stops13h 36m
American Airlines
Deal found 2/4![American Airlines logo]()
$458
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Thu 4/161:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 2/4![United Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:05 am
ONT
- SJU
1 stop11h 33m
United Airlines
Thu 4/161:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 2/4![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 1/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/79:45 pm
ONT
- SJU
2 stops9h 50m
Southwest
Mon 4/135:05 am
SJU
- ONT
2 stops12h 15m
Southwest
Deal found 1/31![Southwest logo]()
$463
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/255:10 am
ONT
- SJU
2 stops12h 28m
United Airlines
Tue 5/52:55 pm
SJU
- ONT
1 stop10h 03m
United Airlines
Deal found 2/4![United Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/89:40 pm
ONT
- SJU
1 stop12h 00m
Southwest
Sat 6/135:00 am
SJU
- ONT
1 stop17h 15m
Southwest
Deal found 2/4![Southwest logo]()
$476
This United Airlines deal was found by Cheapflights users on 2/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:00 am
ONT
- SJU
1 stop9h 38m
United Airlines
Tue 5/121:40 pm
SJU
- ONT
1 stop9h 56m
United Airlines
Deal found 2/1![United Airlines logo]()
$431
Last-minute flights from Ontario to San JuanDiscover last-minute flight deals from Ontario to San Juan. Data last updated February 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Juan. Data last updated February 4, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 1/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/165:00 pm
ONT
- SJU
2 stops16h 01m
Delta
Fri 2/206:15 am
SJU
- ONT
1 stop9h 47m
Delta
Deal found 1/31![Delta logo]()
$400
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/215:02 pm
ONT
- SJU
2 stops12h 58m
American Airlines
Wed 2/258:00 am
SJU
- ONT
2 stops12h 19m
American Airlines
Deal found 2/2![American Airlines logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/222:06 pm
ONT
- SJU
1 stop17h 31m
Multiple Airlines
Fri 2/273:53 am
SJU
- ONT
2 stops32h 06m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$383
This American Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/110:37 pm
ONT
- SJU
1 stop19h 12m
American Airlines
Thu 3/57:33 am
SJU
- ONT
1 stop20h 26m
American Airlines
Deal found 2/4![American Airlines logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/12:06 pm
ONT
- SJU
1 stop17h 31m
Multiple Airlines
Sat 3/73:59 am
SJU
- ONT
2 stops47h 00m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$398
This Delta deal was found by Cheapflights users on 2/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/25:00 pm
ONT
- SJU
2 stops16h 01m
Delta
Fri 3/66:15 am
SJU
- ONT
1 stop9h 47m
Delta
Deal found 2/1![Delta logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/22:06 pm
ONT
- SJU
1 stop17h 31m
Multiple Airlines
Sat 3/77:00 am
SJU
- ONT
2 stops20h 59m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$365
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/25:00 am
ONT
- SJU
1 stop9h 25m
United Airlines
Sat 3/73:25 pm
SJU
- ONT
1 stop11h 26m
United Airlines
Deal found 2/3![United Airlines logo]()
$379
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:22 pm
ONT
- SJU
2 stops29h 57m
Multiple Airlines
Fri 4/36:55 pm
SJU
- ONT
1 stop26h 50m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$393
This Kiwi.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/244:00 pm
ONT
- SJU
1 stop16h 07m
Multiple Airlines
Fri 4/36:55 pm
SJU
- ONT
2 stops27h 24m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$354
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 February 4, 2026.
Search for one-way flight options from Ontario to San Juan. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/216:00 am
ONT
- SJU
2 stops25h 37m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:15 am
ONT
- SJU
2 stops28h 54m
Frontier
Deal found 2/2![Frontier logo]()
$158
This Delta deal was found by Cheapflights users on 2/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/127:05 am
ONT
- SJU
1 stop12h 49m
Delta
Deal found 2/1![Delta logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/244:00 pm
ONT
- SJU
1 stop16h 07m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:22 pm
ONT
- SJU
2 stops29h 57m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:15 am
ONT
- SJU
2 stops39h 14m
Frontier
Deal found 2/2![Frontier logo]()
$185
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/127:00 am
ONT
- SJU
1 stop10h 34m
United Airlines
Deal found 2/4![United Airlines logo]()
$187
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/222:06 pm
ONT
- SJU
1 stop17h 31m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$189
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/91:46 pm
ONT
- SJU
2 stops30h 57m
Frontier
Deal found 2/2![Frontier logo]()
$191
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 February 4, 2026.
Round-trip from | $284 (American Airlines) |
|---|---|
One-way from | $144 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $480 |
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 February 4, 2026.
Use the filters below to find and compare flights from Ontario to San Juan that are best for you.
Fly from
Ontario
Fly to
San Juan
Route
Depart
Return
Price
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Wed 4/29
5:10 am-9:24 pm
2 stops13h 14m
San Juan Luis Munoz Marin Intl
Thu 5/7
1:40 pm-8:36 pm
1 stop9h 56m
$342
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sat 4/11
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Thu 4/16
1:40 pm-8:36 pm
1 stop9h 56m
$374
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sun 4/12
6:05 am-8:38 pm
1 stop11h 33m
San Juan Luis Munoz Marin Intl
Thu 4/16
1:40 pm-8:36 pm
1 stop9h 56m
$374
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Thu 4/23
5:33 pm-2:08 pm
2 stops17h 35m
San Juan Luis Munoz Marin Intl
Tue 4/28
6:49 pm-8:39 pm
1 stop28h 50m
$394
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Fri 5/15
9:55 pm-1:45 pm
1 stop12h 50m
San Juan Luis Munoz Marin Intl
Tue 5/19
5:05 am-4:20 pm
1 stop14h 15m
$397
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Mon 2/16
5:00 pm-1:01 pm
2 stops16h 01m
San Juan Luis Munoz Marin Intl
Fri 2/20
6:15 am-12:02 pm
1 stop9h 47m
$400
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sat 4/25
5:10 am-8:38 pm
2 stops12h 28m
San Juan Luis Munoz Marin Intl
Tue 5/5
2:55 pm-9:58 pm
1 stop10h 03m
$431
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Wed 5/6
5:00 am-5:38 pm
1 stop9h 38m
San Juan Luis Munoz Marin Intl
Tue 5/12
1:40 pm-8:36 pm
1 stop9h 56m
$431
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Fri 5/15
11:25 pm-1:29 pm
1 stop11h 04m
San Juan Luis Munoz Marin Intl
Sun 5/17
12:00 pm-10:09 pm
1 stop13h 09m
$441
OntarioSan Juan
ONT - SJU
ONTSJU
Ontario
Sun 3/1
7:05 pm-10:00 am
2 stops10h 55m
San Juan Luis Munoz Marin Intl
Thu 3/5
2:23 pm-11:59 pm
2 stops13h 36m
$458
Showing 1-10 of 23 results
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 January 30, 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 $145). Flying from Ontario to San Juan in November is currently the most expensive (average of $286). 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 February 4, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United 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.
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
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 February 4, 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 February 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to San Juan
Discover the top 5 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 February 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$73 | Average$467 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$292 | Average$530 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$321 | Average$536 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$365 | Average$619 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$480 | Average$605 | FlexibilityNo cancel fee | On-time63% |