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Cheap Flights from Ontario International (ONT) to San Jose International (SJC)

Compare Ontario International to San Jose International flight deals

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

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Flight deals from Ontario International to San Jose International

Looking for a cheap last-minute deal or the best return flight from Ontario International to San Jose International? Find the lowest prices on one-way and return tickets right here.
San Jose.£120 per passenger.Departing Thu, 19 Feb, returning Mon, 23 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 19 Feb, arriving in San Jose International.Inbound indirect flight with Frontier Airlines, departs from San Jose International on Mon, 23 Feb, arriving in Ontario International.Price includes taxes and charges.From £120, select.
San Jose.£125 per passenger.Departing Tue, 13 Jan, returning Tue, 13 Jan.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Tue, 13 Jan, arriving in San Jose International.Inbound direct flight with Southwest Airlines departs from San Jose International on Tue, 13 Jan, arriving in Ontario International.Price includes taxes and charges.From £125, select.
San Jose.£125 per passenger.Departing Tue, 10 Mar, returning Tue, 10 Mar.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Tue, 10 Mar, arriving in San Jose International.Inbound direct flight with Southwest Airlines departs from San Jose International on Tue, 10 Mar, arriving in Ontario International.Price includes taxes and charges.From £125, select.
San Jose.£146 per passenger.Departing Thu, 26 Feb, returning Sun, 1 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 26 Feb, arriving in San Jose International.Inbound indirect flight with Frontier Airlines, departs from San Jose International on Sun, 1 Mar, arriving in Ontario International.Price includes taxes and charges.From £146, select.
San Jose.£159 per passenger.Departing Thu, 12 Feb, returning Thu, 19 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Thu, 12 Feb, arriving in San Jose International.Inbound direct flight with Southwest Airlines departs from San Jose International on Thu, 19 Feb, arriving in Ontario International.Price includes taxes and charges.From £159, select.
San Jose.£159 per passenger.Departing Mon, 26 Jan, returning Thu, 26 Feb.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Ontario International on Mon, 26 Jan, arriving in San Jose International.Inbound direct flight with Southwest Airlines departs from San Jose International on Thu, 26 Feb, arriving in Ontario International.Price includes taxes and charges.From £159, select.
San Jose.£180 per passenger.Departing Tue, 20 Jan, returning Thu, 16 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 20 Jan, arriving in San Jose International.Inbound indirect flight with Southwest Airlines, departs from San Jose International on Thu, 16 Apr, arriving in Ontario International.Price includes taxes and charges.From £180, select.
San Jose.£203 per passenger.Departing Tue, 1 Sep, returning Mon, 14 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 1 Sep, arriving in San Jose International.Inbound indirect flight with Southwest Airlines, departs from San Jose International on Mon, 14 Sep, arriving in Ontario International.Price includes taxes and charges.From £203, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to San Jose International flights are currently cheapest in February.
Dec
from £462
Jan
from £125
Feb
from £120
Mar
from £125
Apr
from £206
May
from £203
Jun
from £206
Jul
Find prices
Aug
Find prices
Sep
from £203
Oct
Find prices
Nov
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Direct flights from Ontario International to San Jose International

Ontario International to San Jose International: Alternative routes

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

Ontario to San Jose: Flight information

The things to know before you go.
Cheapest flight found£120
Cheapest month to flyFebruary
Average flight time1 hr, 15 mins
Most popular airlineSouthwest Airlines
Average flights per week23

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

The best price we found for a return flight from Ontario International to San Jose International is £120. 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 15 minutes is the average flight time from Ontario International to San Jose International.
Southwest Airlines flies direct from Ontario International to San Jose International.
As of December 2025, there are 23 flights per week flying from Ontario International to San Jose International.
The cheapest month to fly from Ontario International to San Jose International is usually February.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to San Jose International Airport on Thursday, 19 February 2026.
Yes – the average flight time is 1 hour and 15 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 San Jose 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 San Jose is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to San Jose International.

Flying from Ontario International Airport (ONT) to Norman Y. Mineta San Jose International Airport (SJC): what you need to know

  • Hop on a direct flight from Ontario International Airport to Norman Y. Mineta San Jose International Airport and you'll be travelling for an average of 1 hour 15 minutes.

  • San Jose's timezone is UTC-7, which is the same as Ontario.

  • You can choose from 19 weekly Ontario International Airport to Norman Y. Mineta San Jose International Airport flights. The 05:45 departure with Southwest Airlines is the earliest flight you can take. Southwest Airlines operates the last service of the day at 21:40.

  • Arrive at the airport on time so you don't miss your ONT to SJC flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid sprinting to your gate.

  • Travelling during a peak month like August? School holidays and other popular periods can lead to longer queues and delays at check-in and security. Play things extra safe and arrive up to four hours before an international flight and two hours before a domestic departure.

  • Southwest Airlines is your gateway to discovering San Jose (and maybe even some other exciting corners of United States!). Browse the direct flights from Ontario International Airport to Norman Y. Mineta San Jose International Airport offered by this popular airline.

  • Southwest Airlines is the most frequently booked airline on this route.

  • Southwest Airlines is the most punctual carrier offering ONT to SJC flights. An impressive 86.85% of its departures on this route land as scheduled.

  • Think about adding a stopover when booking your ticket from Ontario International Airport to Norman Y. Mineta San Jose International Airport. Just deselect 'Direct flights only' to break up your trip, or even explore someplace new along the way. Here's where you can stop between ONT and SJC:

    • Harry Reid Airport (formerly McCarran Airport)

    • Phoenix Sky Harbour International Airport

    • Salt Lake City International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Norman Y. Mineta San Jose International Airport (SJC)

  • The cheapest price we've seen for a one-way Ontario International Airport to Norman Y. Mineta San Jose International Airport flight is £52. A return ticket right now is £120. Depending on the availability when you book, these fares could change.

  • Don't leave things to the last minute. You're more likely to get cheap tickets from ONT to SJC if you book in advance. Airlines often have some fantastic early bird deals.

  • Schedule your trip for November. That's the cheapest month for flights from Ontario International Airport to Norman Y. Mineta San Jose International Airport. If you have flexibility with your dates, try out the 'Whole month' tool to see the cheapest airfare across each month.

  • Finding cheap flights from ONT to SJC couldn't be easier with Price Alerts. Simply set up one of these automatic alerts and we'll let you know when there's a better deal.

  • Secure the right flight for you by using the filters. To see the 'Cheapest,' 'Best' or 'Fastest' flights from Ontario International Airport to Norman Y. Mineta San Jose International Airport, use the 'Sort by' tool. You can also filter by arrival and departure times, airline, and journey duration.

Handy information about Ontario International Airport (ONT)

  • ONT's address is 2900 E. Airport Drive.

  • Ontario International Airport maintains a solid on-time performance, reducing your chances of a delayed flight. Departures from ONT land on schedule 83.6% of the time.

  • To get to Ontario International Airport from central Ontario, it takes about 10 minutes if you're travelling by car. Of course, this depends on traffic. It's approximately 4 miles from the airport to the city centre.

  • Expect a trip time of around 1 hour 30 minutes on public transport.

  • Need a convenient hotel near ONT? If you're catching an early flight from Ontario International Airport to Norman Y. Mineta San Jose International Airport, these stays will have you moments from your check-in counter:

Arriving at Norman Y. Mineta San Jose International Airport (SJC)

Getting from Norman Y. Mineta San Jose International Airport (SJC) to central San Jose

  • The street address for SJC is 1701 Airport Boulevard, Suite B-1130.

  • From Norman Y. Mineta San Jose International Airport, San Jose is approximately 4 miles away. It takes around 10 minutes to get to the centre driving.

  • If you're travelling by public transport, expect a journey time of about 45 minutes.

When to fly to Norman Y. Mineta San Jose International Airport (SJC)

  • August is the busiest month for flights from Ontario International Airport to Norman Y. Mineta San Jose International Airport. For smaller crowds, head to San Jose in May.

  • Lock in your flight from Ontario International Airport to Norman Y. Mineta San Jose International Airport for August if you'd like to visit San Jose during its warmest month. You can expect temperatures of between 11ºC (52ºF) and 32ºC (90ºF).

  • If you like cooler conditions, search for a cheap ticket from ONT to SJC in January. Temperatures average between 3ºC (37ºF) and 18ºC (64ºF) then.

Explore more of United States

  • You've seen San Jose, now it's time to discover other parts of United States. Journey about 310 miles south-east to Los Angeles to check off its top attractions. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you'll have a full itinerary ahead.

  • If there's time to check out another well-known destination in United States, head for San Francisco, about 40 miles north-west of San Jose. Golden Gate Bridge, Alcatraz Island and Lombard Street are highlights.

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