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Cheap Flights from Ontario International to San Juan

Compare Ontario International to San Juan flight deals

Find the cheapest month or even day of the year to fly to San Juan

Book the best San Juan fare with no extra fees

Flight deals from Ontario International to San Juan

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to San Juan? If you want to travel next month, return fares start from R 8,099. Find the lowest prices on one-way and return tickets right here.
San Juan.R 3,057 per passenger.Departing Mon, 2 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 2 Nov, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 3,057, select.
San Juan.R 3,059 per passenger.Departing Mon, 19 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 19 Oct, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 3,059, select.
San Juan.R 3,059 per passenger.Departing Mon, 31 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 31 Aug, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 3,059, select.
San Juan.R 3,149 per passenger.Departing Sun, 13 Sep.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 13 Sep, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 3,149, select.
San Juan.R 3,401 per passenger.Departing Tue, 28 Jul.One-way flight with United.Outbound indirect flight with United, departs from Ontario International on Tue, 28 Jul, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 3,401, select.
San Juan.R 4,139 per passenger.Departing Tue, 8 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 8 Dec, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 4,139, select.
San Juan.R 5,066 per passenger.Departing Mon, 29 Jun.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 29 Jun, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 5,066, select.
San Juan.R 5,470 per passenger.Departing Mon, 4 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 4 Jan, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 5,470, select.
San Juan.R 14,039 per passenger.Departing Tue, 16 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 16 Feb, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From R 14,039, select.

Find the cheapest month to fly from Ontario International to San Juan

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to San Juan flights are currently cheapest in November.
Jun
from R 5,066
Jul
from R 3,401
Aug
from R 3,059
Sep
from R 3,149
Oct
from R 3,059
Nov
from R 3,057
Dec
from R 4,139
Jan
from R 5,470
Feb
from R 14,039
Mar
Find prices
Apr
Find prices
May
Find prices

Alternative Ontario International to San Juan routes

Looking for the cheapest, fastest or easiest route from Ontario International to San Juan? You could fly into the following airports instead.

San Juan Isla Grande

1km from central San Juan
Closest
Search flights

San Juan Luis Munoz Marin

11km from central San Juan
Cheapest
from R 3,057
Search flights

Roosevelt Roads

55km from central San Juan
Search flights

Ponce

70km from central San Juan
from R 8,911
Search flights

Vieques

82km from central San Juan
Search flights

Culebra

85km from central San Juan
Search flights

Ontario to San Juan: Flight information

The things to know before you go.
Cheapest flight foundR 3,058
Cheapest month to flyNovember

Finding cheap flights from Ontario International to San Juan: Frequently asked questions

There are 6 airports in San Juan: San Juan Isla Grande, San Juan Luis Munoz Marin, Roosevelt Roads, Ponce, Vieques, and Culebra.
The best price we found for a return flight from Ontario International to San Juan is R 6,122. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to San Juan. But we found flights with one or more stops from R 6,119.
As of June 2026, there are no flights flying from Ontario International to San Juan.
The cheapest month to fly from Ontario International to San Juan is usually August.
If you're flying from Ontario International Airport, the cheapest airport near San Juan is San Juan Luis Munoz Marin – which is 11.3 km away from the centre of San Juan. We've found flights into this airport from R 6,122.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to San Juan on Tuesday, 25 August 2026.
No airlines currently offer direct flights between Ontario International Airport and San Juan. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Juan but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Juan is around 40 days in advance, so don’t leave your flight to the last minute.
In June, the average temperature is usually around 27°C. August is typically the warmest month in San Juan, when it usually averages around 29°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging 23°C. The rainiest month is September.
Currently, Southwest Airlines offers the cheapest flight tickets to San Juan.

Travelling from Ontario International Airport (ONT) to San Juan: what you need to know

  • San Juan is four hours ahead of Ontario, where Ontario International Airport is located. San Juan follows the UTC-4 timezone.

  • For a stress-free journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. That way, you can comfortably board your ONT to San Juan flight.

  • During popular months like July, it's a good idea to get to the airport earlier than usual. Plan to arrive two hours before a domestic departure and four hours ahead for international flights whenever you're travelling during high season in general.

  • Consider adding a stopover to potentially save on your plane ticket from ONT to San Juan. Just uncheck 'Direct flights only' during your search. Take a detour (and maybe pocket some savings) by stopping at one of these airports:

    • Dallas Fort Worth International Airport (DFW)

    • Denver International Airport (DEN)

    • Houston Hobby Airport (HOU)

  • Located around 5 kilometres from the centre of Ontario, ONT can be reached in about 15 minutes by car, depending on traffic. Travelling on public transport takes roughly 45 minutes.

  • Want an easy start to your journey? Stay near ONT. Whether you're boarding an early flight from Ontario International Airport to San Juan or just don't like being rushed, these hotels are all about convenience:

  • Ontario International Airport has an excellent on-time record, reducing your chances of a delayed flight. Departures from ONT land on schedule 83% of the time.

  • The address for ONT is 2900 E. Airport Drive.

How to find the cheapest flights from Ontario International Airport (ONT) to San Juan

  • R 3,057 is the lowest price we've seen for a one-way Ontario International Airport to San Juan flight. A return plane ticket right now is R 6,119. Depending on when you book and the availability, these fares could change.

  • Don't wait until the last minute. You're more likely to find cheap flights from ONT to San Juan if you book in advance. Airlines often have some great early bird rates.

  • The 'Whole month' search tool will show you the cheapest tickets from Ontario International Airport to San Juan across the entire month. It's a great way to snap up a bargain if your travel plans are flexible.

  • There's no need to check every day to find out if fares have dropped when you create a Price Alert. We'll notify you the moment there's an even better deal on cheap flights from ONT to San Juan.

  • Find an affordable flight from Ontario International Airport to San Juan with the help of our filters. Select your ideal times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

Airports in San Juan

Luis Munoz Marin International Airport (SJU)

  • Luis Munoz Marin International Airport (SJU) to central San Juan takes about 20 minutes by car. The centre is roughly 11 kilometres away.

  • It takes around 1 hour if you're using public transport.

  • The last thing you need is a lengthy journey to your hotel if you're getting in late on a flight from Ontario International Airport to San Juan. Reserve one of these accommodation options near SJU instead:

  • To get the best deal, book your ride from Luis Munoz Marin International Airport about two weeks in advance of your flight from ONT to San Juan.

Best time to go to San Juan

  • It's time to figure out your trip dates for your flight from Ontario International Airport to San Juan. March is the most popular month to visit San Juan. If you like a more relaxed vibe, go in December.

  • The warmest month in San Juan is August, with temperatures ranging between 24ºC (75ºF) and 32ºC (90ºF). Lock in your Ontario International Airport to San Juan plane ticket then if that's the weather you find most pleasant.

  • Search for cheap tickets from ONT to San Juan in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 21ºC (70ºF) and 28ºC (82ºF) on average.

More about San Juan

Explore more of Puerto Rico

  • You've seen San Juan, now it's time to explore more of Puerto Rico. Journey about 113 kilometres west to Aguadilla to check off its leading attractions. From Silla Aguadilla to Bridges Surf Beach and Playa Rompe Olas, you've got a jam-packed schedule ahead.

  • Isabela is another well-known destination in Puerto Rico and is around 105 kilometres west of San Juan. No trip is complete without dropping by Playa montones, Shore Island Beach and Guajataca Forest Reserve.

Plan the rest of your trip from Ontario to San Juan

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.