Cheap Flights from San Jose (SJO) to Ontario (ONT)

Compare San Jose Juan Santamaria 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

Map with a flight path from San Jose Juan Santamaria to Ontario International. A plane icon is halfway along the route with a label that says "1+ stops".
1+ stops

Your route at a glance

Cheapest deal$492
Cheapest monthJanuary
Most popular airlineAmerican Airlines

Flight deals from San Jose Juan Santamaria to Ontario International

Looking for a cheap last-minute deal or the best return flight from San Jose Juan Santamaria to Ontario International? Find the lowest prices on one-way and return tickets right here.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Jose Juan Santamaria to Ontario International flights are currently cheapest in January.

San Jose Juan Santamaria to Ontario International: Alternative routes

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

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

The best price we found for a return flight from San Jose Juan Santamaria to Ontario International is $492. 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 Jose Juan Santamaria to Ontario International. But we found flights with one or more stops from $492.
As of August 2025, there are no flights flying from San Jose Juan Santamaria to Ontario International.
The cheapest month to fly from San Jose Juan Santamaria to Ontario International is usually January.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Jose Juan Santamaria Airport to Ontario International Airport on Thursday, 22 January 2026.
No airlines currently offer direct flights between San Jose Juan Santamaria 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, United offers the cheapest flight tickets to Ontario International.

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

  • The timezone in Ontario is UTC-7, which is one hour behind San Jose.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules worth sticking to. Be at the airport on time to board your SJO to ONT flight.

  • During popular months like July, it's a good idea to get to the airport well in advance. Arrive two hours before domestic departures and four hours ahead for an international flight whenever you're travelling during a peak period in general.

  • We make it a cinch to book a flight with a stopover. To see all your options for tickets from Juan Santamaria International Airport to Ontario International Airport, deselect 'Direct flights only.' Then, pick a flight offering a stop long enough to explore the city of your choice. Stopovers between SJO and ONT include:

    • George Bush Intercontinental Airport

    • William P. Hobby Airport

    • Dallas/Fort Worth International Airport

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

  • $282 is the lowest price for a one-way Juan Santamaria International Airport to Ontario International Airport flight. Return flights start from $492. These prices may change depending on availability and demand.

  • To get your hands on cheap tickets from SJO to ONT, book in advance. Airlines generally offer the most competitive fares when flights are first released.

  • If you can be flexible with your travel plans, try using the 'Whole month' search function. It'll give you the cheapest price across each month when searching for your flight from Juan Santamaria International Airport to Ontario International Airport.

  • Cut down on the time spent looking for cheap flights from SJO to ONT by setting up a Price Alert. We'll send you an email or notification on the app when a new discounted fare appears.

  • Select your preferred arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Juan Santamaria International Airport to Ontario International Airport.

Handy information about Juan Santamaria International Airport (SJO)

  • Of all flights departing from Juan Santamaria International Airport, 79.83% arrive on time at their destination.

  • To reach Juan Santamaria International Airport from central San Jose, it'll take about 20 minutes if you're going by car. This depends on traffic, however. It's approximately 18 kilometres from the airport to the city centre.

  • The trip when using public transport typically takes 2 hours 20 minutes.

  • Searching for a handy hotel close to SJO? If you've booked an early flight from Juan Santamaria International Airport to Ontario International Airport, these stays will put you moments from check-in:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport to the centre of Ontario has a drive time of about 10 minutes. It's approximately 6 kilometres away.

  • It'll take around 1 hour 30 minutes to get there using public transport.

When to fly to Ontario International Airport (ONT)

  • It's time to pick your travel dates for your flight from Juan Santamaria International Airport to Ontario International Airport. August is the busiest month to visit Ontario. If you'd like a more laid-back vibe, go in May.

  • The warmest month in Ontario is August, with temperatures ranging between 15ºC (59ºF) and 35ºC (95ºF). Book your flights from Juan Santamaria International Airport to Ontario International Airport in this month if you like this kind of weather.

  • If you like cooler conditions, look for a cheap ticket from SJO to ONT in January. Average temperatures are between 4ºC (39ºF) and 23ºC (73ºF) then.

Explore more of United States

  • Ontario has plenty going for it, but there are so many other corners of United States just waiting to be discovered. About 56 kilometres west of Ontario, a visit to Los Angeles will keep your itinerary packed. Start with leading attractions like Griffith Observatory, The Broad and La Brea Tar Pits & Museum.

  • If you're ready to explore another major destination in United States, consider San Diego, roughly 153 kilometres south of Ontario. San Diego Zoo, USS Midway Museum and SeaWorld San Diego are highlights.

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