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Cheap Flights from San Jose to Ontario International

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Compare San Jose 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 Jose to Ontario International

Looking for a cheap last-minute deal or the best return flight from San Jose to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.125 € per passenger.Departing Thu, 5 Jun, returning Mon, 9 Jun.Return flight with Spirit Airlines and Frontier Airlines.Outbound indirect flight with Spirit Airlines, departs from San Jose International on Thu, 5 Jun, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 9 Jun, arriving in San Jose International.Price includes taxes and charges.From 125 €, select.
Ontario.134 € per passenger.Departing Thu, 22 May, returning Sun, 25 May.Return flight with Spirit Airlines and Frontier Airlines.Outbound indirect flight with Spirit Airlines, departs from San Jose International on Thu, 22 May, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sun, 25 May, arriving in San Jose International.Price includes taxes and charges.From 134 €, select.
Ontario.154 € per passenger.Departing Tue, 15 Jul, returning Tue, 15 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Jose International on Tue, 15 Jul, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Tue, 15 Jul, arriving in San Jose International.Price includes taxes and charges.From 154 €, select.
Ontario.154 € per passenger.Departing Tue, 20 May, returning Wed, 21 May.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Jose International on Tue, 20 May, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 21 May, arriving in San Jose International.Price includes taxes and charges.From 154 €, select.
Ontario.154 € per passenger.Departing Tue, 29 Jul, returning Tue, 5 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Jose International on Tue, 29 Jul, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Tue, 5 Aug, arriving in San Jose International.Price includes taxes and charges.From 154 €, select.
Ontario.154 € per passenger.Departing Tue, 3 Jun, returning Wed, 4 Jun.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Jose International on Tue, 3 Jun, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 4 Jun, arriving in San Jose International.Price includes taxes and charges.From 154 €, select.
Ontario.154 € per passenger.Departing Tue, 7 Oct, returning Wed, 29 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Jose International on Tue, 7 Oct, arriving in Ontario International.Inbound direct flight with Southwest Airlines departs from Ontario International on Wed, 29 Oct, arriving in San Jose International.Price includes taxes and charges.From 154 €, select.
Ontario.162 € per passenger.Departing Wed, 10 Sep, returning Wed, 17 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from San Jose International on Wed, 10 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 17 Sep, arriving in San Jose International.Price includes taxes and charges.From 162 €, select.

Find the cheapest month to fly from San Jose 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 to Ontario International flights are currently cheapest in June.
May
from 134 €
Jun
from 125 €
Jul
from 154 €
Aug
from 163 €
Sep
from 162 €
Oct
from 154 €
Nov
from 223 €
Dec
from 223 €
Jan
Find prices
Feb
Find prices
Mar
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Apr
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Direct flights from San Jose to Ontario International

San Jose to Ontario International: Alternative routes

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

San Jose to Ontario: Flight information

The things to know before you go.
Cheapest flight found125 €
Cheapest month to flyJune
Average flight time1 hr, 17 mins
Most popular airlineSouthwest Airlines
Average flights per week22

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

The best price we found for a return flight from San Jose to Ontario International is 125 €. 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.
1 hour and 17 minutes is the average flight time from San Jose to Ontario International.
Southwest Airlines and Sun Country Airlines fly direct from San Jose to Ontario International.
As of May 2025, there are 22 flights per week flying from San Jose to Ontario International.
The cheapest month to fly from San Jose to Ontario International is usually May 2025.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Jose to Ontario International Airport on Thursday, 5 June 2025.
Yes – the average flight time is 1 hour and 17 minutes.
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.

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

  • San Jose's main airport is Norman Y. Mineta San Jose International Airport (SJC). Check out your departure options from this terminal when booking flights from San Jose to Ontario International Airport (ONT).

  • Expect to be in the air for 1 hour 16 minutes. That's the average journey time for a direct flight from San Jose to Ontario International Airport.

  • Ontario (where Ontario International Airport is located) and San Jose share the UTC-7 timezone. Easily coordinate travel plans without worrying about time differences.

  • Norman Y. Mineta San Jose International Airport (SJC) to Ontario International Airport (ONT) is the most popular route. There are 19 direct departures a week to choose from. If you prefer a later start to the day, hop on the last flight with Southwest Airlines at 21:50. Go for the first SJC to ONT departure operated by Southwest Airlines at 06:30 if you want to get going earlier.

  • Your flight from San Jose to ONT won't wait if you're late, so don't forget to check in on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • Popular months like August or holiday periods such as Christmas and New Year will mean longer lines at check-in and security. If you're travelling then, play it safe and head to the airport even earlier. Arriving two hours before domestic flights and up four hours ahead of an international flight is a smart idea.

Airports in San Jose

Norman Y. Mineta San Jose International Airport (SJC)

  • You can take a direct flight from San Jose to Ontario International Airport (ONT) leaving from Norman Y. Mineta San Jose International Airport (SJC).

  • Southwest Airlines is a well-known airline that offers direct flights from San Jose to Ontario International Airport taking off from SJC.

  • The distance from central San Jose to SJC is around 6 kilometres. Use travel apps like Google Maps for the quickest way to get there, whether you want to drive or use public transport.

  • Need a handy hotel near Norman Y. Mineta San Jose International Airport? If you're catching an early flight from San Jose to Ontario International Airport, these stays will have you moments from your departure gate:

About Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • Ontario International Airport is approximately 6 kilometres from the centre of Ontario. With your own car rental or in a cab, the drive is about 10 minutes.

  • Getting there on public transport takes roughly 1 hour and 28 minutes.

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

  • 52 € is the lowest price we've found for a one-way ticket from San Jose to Ontario International Airport. Return flights start from 125 €. Prices may vary depending on availability at the time of booking.

  • To secure cheap tickets from San Jose to ONT, book your trip 9 months before your departure.

  • The cheapest month for tickets from San Jose to Ontario International Airport is June. Use the 'Whole month' tool to find the most affordable day to fly if you're flexible with your departure dates.

  • Log into your online account or use the app to create a Price Alert. You'll get notified right away if there's a deal you can't miss. It's simple to do, and it'll save you time searching for cheap tickets from San Jose to ONT every day.

  • Use the filters to tailor your flights from San Jose to Ontario International Airport. Select your preferred departure and arrival times, number of stops and airlines. You can also sort your results by 'Cheapest' to get the best deals.

The best time to fly from San Jose to Ontario International Airport (ONT)

  • May is the quietest time of year to travel to Ontario. Alternatively, follow the crowds and visit in August. This is the most popular month for flights from San Jose to Ontario International Airport, but the best time to go is your call.

  • The warmest month in Ontario is August, with the temperature ranging between 15ºC and 35ºC. Book your flights from San Jose to ONT in this month if you enjoy this type of weather.

  • Look for cheap flights from San Jose to Ontario International Airport in January if you like travelling in cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC and 23ºC on average.

More about Ontario

  • When it comes to searching for somewhere to rest your head, you'll find the best places to stay in Ontario right here. Explore these hotels once you've booked your flight from San Jose to Ontario International Airport:

  • Graber Olive House and Anthony Munoz Park are just two of the major attractions to add to your Ontario to-do list. Continue your sightseeing adventures at James R. Bryant Dog Park.

Complete your Ontario trip with a car rental

  • Finding you a cheap flight from San Jose to Ontario International Airport isn't the only trick up our sleeve. Check out our car rentals in Ontario and see the sights your way. We search for deals from trusted car rental providers and put them all in one place. You can instantly compare rates and then book with no fees.

Plan the rest of your trip from San Jose to Ontario

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