$161+ Cheap flights from San Juan to Ontario (ONT)
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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Mrz 11 — Mrz 181
1 adult, Economy
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Cheapest flights from San Juan to OntarioExplore the most affordable flight options available from San Juan to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Februar 9, 2026.
Explore the most affordable flight options available from San Juan to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Februar 9, 2026.
This American Airlines deal was found by Cheapflights users on 2/6. 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.
Do 3/58:40 am
SJU
- ONT
1 stop16h 44m
American Airlines
Mo 3/911:59 pm
ONT
- SJU
1 stop11h 04m
American Airlines
Deal found 2/6![American Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 2/8. 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.
Fr 5/295:35 am
SJU
- ONT
1 stop12h 40m
Southwest
Mo 6/229:40 am
ONT
- SJU
1 stop11h 45m
Southwest
Deal found 2/8![Southwest logo]()
$332
This American Airlines deal was found by Cheapflights users on 2/8. 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.
Mi 8/1210:32 am
SJU
- ONT
2 stops13h 56m
American Airlines
So 8/1611:59 pm
ONT
- SJU
1 stop11h 26m
American Airlines
Deal found 2/8![American Airlines logo]()
$378
This Southwest deal was found by Cheapflights users on 2/8. 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.
Do 7/1610:20 am
SJU
- ONT
1 stop15h 05m
Southwest
Mi 7/229:40 pm
ONT
- SJU
1 stop11h 45m
Southwest
Deal found 2/8![Southwest logo]()
$419
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Mi 4/292:55 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Di 5/125:00 am
ONT
- SJU
1 stop9h 38m
United Airlines
Deal found 2/6![United Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 2/8. 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.
Fr 5/225:35 am
SJU
- ONT
1 stop12h 40m
Southwest
Mi 5/279:55 pm
ONT
- SJU
1 stop11h 15m
Southwest
Deal found 2/8![Southwest logo]()
$443
This Southwest deal was found by Cheapflights users on 2/8. 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.
Do 7/165:00 am
SJU
- ONT
2 stops12h 00m
Southwest
Di 7/219:55 am
ONT
- SJU
2 stops11h 20m
Southwest
Deal found 2/8![Southwest logo]()
$458
This Southwest deal was found by Cheapflights users on 2/8. 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.
Sa 5/3010:00 am
SJU
- ONT
1 stop15h 00m
Southwest
Mo 6/229:40 am
ONT
- SJU
1 stop11h 45m
Southwest
Deal found 2/8![Southwest logo]()
$468
Best flights from San Juan to OntarioDiscover carefully curated flight deals from San Juan to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Februar 9, 2026.
Discover carefully curated flight deals from San Juan to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Februar 9, 2026.
This American Airlines deal was found by Cheapflights users on 2/6. 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.
Do 3/58:40 am
SJU
- ONT
1 stop16h 44m
American Airlines
Mo 3/97:59 pm
ONT
- SJU
2 stops10h 01m
American Airlines
Deal found 2/6![American Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 2/8. 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.
Fr 5/295:35 am
SJU
- ONT
1 stop12h 40m
Southwest
Mo 6/229:40 am
ONT
- SJU
1 stop11h 45m
Southwest
Deal found 2/8![Southwest logo]()
$332
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Mi 4/292:55 pm
SJU
- ONT
1 stop9h 55m
United Airlines
Di 5/125:00 am
ONT
- SJU
1 stop9h 38m
United Airlines
Deal found 2/6![United Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 2/8. 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.
Do 7/2310:20 am
SJU
- ONT
1 stop15h 05m
Southwest
Mi 7/291:05 pm
ONT
- SJU
1 stop8h 40m
Southwest
Deal found 2/8![Southwest logo]()
$419
This Southwest deal was found by Cheapflights users on 2/8. 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.
Do 7/165:00 am
SJU
- ONT
2 stops12h 00m
Southwest
Mi 7/229:40 pm
ONT
- SJU
1 stop11h 45m
Southwest
Deal found 2/8![Southwest logo]()
$419
This Southwest deal was found by Cheapflights users on 2/8. 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.
Fr 5/225:35 am
SJU
- ONT
1 stop12h 40m
Southwest
Mi 5/279:55 pm
ONT
- SJU
1 stop11h 15m
Southwest
Deal found 2/8![Southwest logo]()
$443
Last-minute flights from San Juan to OntarioDiscover last-minute flight deals from San Juan to Ontario. Data last updated Februar 9, 2026 and is based on user searches.
Discover last-minute flight deals from San Juan to Ontario. Data last updated Februar 9, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 2/6. 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.
Do 2/126:15 am
SJU
- ONT
1 stop9h 47m
Delta
Mo 2/1610:20 pm
ONT
- SJU
1 stop10h 41m
Delta
Deal found 2/6![Delta logo]()
$540
This United Airlines deal was found by Cheapflights users on 2/7. 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.
Sa 2/1410:15 am
SJU
- ONT
2 stops14h 35m
United Airlines
Mo 2/166:00 am
ONT
- SJU
1 stop11h 26m
United Airlines
Deal found 2/7![United Airlines logo]()
$550
This eDestinos deal was found by Cheapflights users on 2/8. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 2/174:11 pm
SJU
- ONT
2 stops30h 11m
Frontier
Sa 2/216:00 am
ONT
- SJU
2 stops29h 08m
Frontier
Deal found 2/8![Frontier logo]()
$474
This American Airlines deal was found by Cheapflights users on 2/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 2/178:00 am
SJU
- ONT
2 stops15h 09m
American Airlines
Sa 2/219:53 am
ONT
- SJU
2 stops10h 59m
American Airlines
Deal found 2/7![American Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 2/5. 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.
Fr 2/203:46 pm
SJU
- ONT
1 stop10h 13m
United Airlines
Di 2/245:00 am
ONT
- SJU
2 stops15h 36m
United Airlines
Deal found 2/5![United Airlines logo]()
$490
This American Airlines deal was found by Cheapflights users on 2/6. 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.
Do 3/58:40 am
SJU
- ONT
1 stop16h 44m
American Airlines
Mo 3/97:59 pm
ONT
- SJU
2 stops10h 01m
American Airlines
Deal found 2/6![American Airlines logo]()
$290
One-way flights from San Juan to OntarioSearch for one-way flight options from San Juan to Ontario. Find affordable one-way fares based on user searches. Data last updated Februar 9, 2026.
Search for one-way flight options from San Juan to Ontario. Find affordable one-way fares based on user searches. Data last updated Februar 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Mo 3/169:58 pm
SJU
- ONT
2 stops29h 01m
Frontier
Deal found 2/8![Frontier logo]()
$161
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/232:20 pm
SJU
- ONT
1 stop10h 34m
Delta
Deal found 2/8![Delta logo]()
$168
This American Airlines deal was found by Cheapflights users on 2/6. 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.
Mi 4/297:25 am
SJU
- ONT
1 stop16h 42m
American Airlines
Deal found 2/6![American Airlines logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 2/236:00 am
SJU
- ONT
3 stops59h 52m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$185
This United Airlines deal was found by Cheapflights users on 2/6. 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.
Di 4/281:00 am
SJU
- ONT
3 stops19h 47m
United Airlines
Deal found 2/6![United Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 2/236:00 am
SJU
- ONT
2 stops43h 34m
Frontier
Deal found 2/7![Frontier logo]()
$191
This Delta deal was found by Cheapflights users on 2/6. 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.
Sa 4/187:30 am
SJU
- ONT
1 stop14h 03m
Delta
Deal found 2/6![Delta logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
Do 3/194:11 pm
SJU
- ONT
2 stops58h 48m
Frontier
Deal found 2/6![Frontier logo]()
$212
This Southwest deal was found by Cheapflights users on 2/6. 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.
Do 3/195:00 am
SJU
- ONT
1 stop12h 05m
Southwest
Deal found 2/6![Southwest logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Do 3/191:39 am
SJU
- ONT
2 stops49h 20m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
Do 3/1912:05 pm
SJU
- ONT
3 stops29h 40m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$244
This American Airlines deal was found by Cheapflights users on 2/8. 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.
Fr 2/272:44 pm
SJU
- ONT
1 stop10h 40m
American Airlines
Deal found 2/8![American Airlines logo]()
$255
Find flight deals from San Juan to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from San Juan (PR1) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated Februar 9, 2026.
Round-trip from | $290 (American Airlines) |
|---|---|
One-way from | $161 (Kiwi.com) |
Popular in | April |
Cheapest in | January |
Average price | $461 |
Cheapflights Fare Finder
Customize your flight search to find flights from San Juan to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated Februar 9, 2026.
Use the filters below to find and compare flights from San Juan to Ontario that are best for you.
Fly from
San Juan
Fly to
Ontario
Route
Depart
Return
Price
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Do 3/5
8:40 am-9:24 pm
1 stop16h 44m
Ontario
Mo 3/9
7:59 pm-9:00 am
2 stops10h 01m
$290
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Fr 5/29
5:35 am-3:15 pm
1 stop12h 40m
Ontario
Mo 6/22
9:40 am-12:25 am
1 stop11h 45m
$332
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Do 7/23
10:20 am-10:25 pm
1 stop15h 05m
Ontario
Mi 7/29
1:05 pm-12:45 am
1 stop8h 40m
$419
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Do 7/16
5:00 am-2:00 pm
2 stops12h 00m
Ontario
Mi 7/22
9:40 pm-12:25 pm
1 stop11h 45m
$419
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Mi 4/29
2:55 pm-9:50 pm
1 stop9h 55m
Ontario
Di 5/12
5:00 am-5:38 pm
1 stop9h 38m
$431
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Fr 5/22
5:35 am-3:15 pm
1 stop12h 40m
Ontario
Mi 5/27
9:55 pm-12:10 pm
1 stop11h 15m
$443
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Sa 5/23
2:20 pm-9:54 pm
1 stop10h 34m
$168
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Fr 5/1
7:20 am-9:58 pm
2 stops17h 38m
$187
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Di 4/7
7:11 am-10:09 am
2 stops29h 58m
$187
San JuanOntario
SJU - ONT
SJUONT
San Juan Luis Munoz Marin Intl
Di 4/28
1:00 am-5:47 pm
3 stops19h 47m
$187
Showing 1-10 of 16 results
Best time to book a flight from San Juan to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from San Juan with our price prediction graph.
PR1-ONT
SJU-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Juan to Ontario
PR1-ONT
SJU-ONT
What is the cheapest month to book a flight from San Juan to Ontario?
Currently, October is the cheapest month in which you can book a flight from San Juan to Ontario (average of $172). Flying from San Juan to Ontario 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 Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated Februar 9, 2026.
Read through reviews of airlines operating flights from San Juan to Ontario, such as United Airlines and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Crew
8.1
Boarding
7.7
Comfort
7.3
Food
6.6
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Related info for your journey
Find useful and relevant information for your journey from San Juan to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on Februar 9, 2026.
San Juan and Ontario flights
Browse other San Juan and Ontario flight options. Last updated on Februar 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from San Juan to Ontario
Discover the top 2 airlines that operate flights from San Juan to Ontario. 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 Februar 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$355 | Average$600 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$367 | Average$520 | FlexibilityNo cancel fee | On-time69% |