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Cheap Flights from San Juan (SJU) to Ontario (ONT)

Compare San Juan Luis Munoz Marin to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from San Juan Luis Munoz Marin to Ontario International

Looking for a cheap last-minute deal or the best return flight from San Juan Luis Munoz Marin to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.$678 per passenger.Departing Sun, 28 Sep, returning Fri, 3 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Sun, 28 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 3 Oct, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $678, select.
Ontario.$730 per passenger.Departing Tue, 23 Sep, returning Tue, 30 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Tue, 23 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 30 Sep, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $730, select.
Ontario.$733 per passenger.Departing Fri, 5 Dec, returning Wed, 10 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Fri, 5 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 10 Dec, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $733, select.
Ontario.$830 per passenger.Departing Sat, 30 Aug, returning Sat, 6 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Sat, 30 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 6 Sep, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $830, select.
Ontario.$854 per passenger.Departing Thu, 30 Oct, returning Thu, 6 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Thu, 30 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 6 Nov, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $854, select.
Ontario.$868 per passenger.Departing Thu, 28 Aug, returning Sun, 31 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Thu, 28 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 31 Aug, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $868, select.
Ontario.$961 per passenger.Departing Wed, 30 Jul, returning Tue, 5 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Wed, 30 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 5 Aug, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $961, select.
Ontario.$1,004 per passenger.Departing Wed, 23 Jul, returning Wed, 30 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Juan Luis Munoz Marin on Wed, 23 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 30 Jul, arriving in San Juan Luis Munoz Marin.Price includes taxes and charges.From $1,004, select.

Find the cheapest month to fly from San Juan Luis Munoz Marin to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Juan Luis Munoz Marin to Ontario International flights are currently cheapest in September.
Jul
from $1,004
Aug
from $868
Sep
from $730
Oct
from $1,160
Nov
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Dec
from $733
Jan
from $1,283
Feb
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Mar
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Apr
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May
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Jun
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San Juan Luis Munoz Marin to Ontario International: Alternative routes

Compare routes from San Juan Luis Munoz Marin to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

San Juan to Ontario: Flight information

The things to know before you go.
Cheapest flight found$678
Cheapest month to flySeptember

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

The best price we found for a return flight from San Juan Luis Munoz Marin to Ontario International is $678. 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 San Juan Luis Munoz Marin to Ontario International. But we found flights with one or more stops from $678.
As of July 2025, there are no flights flying from San Juan Luis Munoz Marin to Ontario International.
The cheapest month to fly from San Juan Luis Munoz Marin to Ontario International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Juan Luis Munoz Marin Airport to Ontario International Airport on Sunday, 28 September 2025.
No airlines currently offer direct flights between San Juan Luis Munoz Marin Airport and Ontario International Airport. 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 Ontario International 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 Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to Ontario International.

Travelling from Luis Munoz Marin International Airport (SJU) to Ontario International Airport (ONT): what you need to know

  • Ontario is three hours behind San Juan and observes the UTC-7 timezone.

  • Your SJU to ONT flight won't wait if you're running late, so be at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.

  • Flying during a peak month such as July? School holidays and other high seasons can mean longer lines and delays at check-in and security. Be extra cautious and get there up to four hours ahead of an international flight and two hours before a domestic departure.

  • We make it easy to book a flight with a stopover. To see your options for tickets from Luis Munoz Marin International Airport to Ontario International Airport, uncheck 'Direct flights only.' Then, pick a flight with a stop long enough to visit the city of your choice. Top stopovers between SJU and ONT include:

    • George Bush Intercontinental Airport

    • Hartsfield-Jackson Atlanta International Airport

    • Denver International Airport

How to find the cheapest flights from Luis Munoz Marin International Airport (SJU) to Ontario International Airport (ONT)

  • Currently, $257 is the cheapest price we've seen for a one-way Luis Munoz Marin International Airport to Ontario International Airport flight. The best price for a return plane ticket is $678. Bear in mind that fares may change due to availability at the time of booking.

  • It's a good idea to book in advance if you want to get cheap tickets from SJU to ONT. That's because airlines adjust prices based on demand, which tends to increase closer to departure.

  • The 'Whole month' search function shows you the cheapest flights from Luis Munoz Marin International Airport to Ontario International Airport across each month. It's an easy way to snap up a bargain if your travel plans are flexible.

  • Getting your hands on cheap flights from SJU to ONT is a breeze with Price Alerts. Simply create one of these automatic alerts and we'll notify you when a new deal comes up.

  • Find the ideal flight for you with the help of the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Luis Munoz Marin International Airport to Ontario International Airport, use the 'Sort by' function. You can also filter by airline, arrival and departure times, and number of stops.

Handy information about Luis Munoz Marin International Airport (SJU)

  • 73.65% of flights departing from Luis Munoz Marin International Airport make it to their destination on schedule.

  • Central San Juan to Luis Munoz Marin International Airport is around 8 kilometres. Depending on traffic, it'll take about 10 minutes to get there if you're ride-sharing, catching a cab or driving.

  • The journey on public transport will take about 55 minutes.

  • Looking for a handy hotel near SJU? If you're catching an early flight from Luis Munoz Marin International Airport to Ontario International Airport, these accommodation options will have you moments from your departure lounge:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • From Ontario International Airport, Ontario is approximately 6 kilometres away. It takes around 10 minutes to reach the centre driving.

  • If you're travelling by public transport, expect a journey of about 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • August is the busiest month for flights from Luis Munoz Marin International Airport to Ontario International Airport. To skip the crowds, head to Ontario in May.

  • When booking your flight from Luis Munoz Marin International Airport to Ontario International Airport, think about the kind of weather you enjoy. August is the warmest month in Ontario, with temperatures ranging from 15ºC (59ºF) to 35ºC (95ºF).

  • Look for cheap tickets from SJU to ONT in January if you like cooler conditions. Temperatures are at their lowest then, ranging between 4ºC (39ºF) and 23ºC (73ºF) on average.

Explore more of United States

  • Ontario has its own special appeal, but there are so many other parts of United States waiting to be discovered. About 56 kilometres west of Ontario, a visit to Los Angeles will fill your itinerary to the brim. Check out popular attractions like Griffith Observatory, The Broad and La Brea Tar Pits & Museum.

  • San Diego is another essential stop in United States and is around 153 kilometres south of Ontario. No trip is complete without visiting San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Plan the rest of your trip from San Juan to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.