Cheap flight deals from San Jose to Ontario

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

Round-trip
One way

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from San Jose to Ontario?

We monitor flight fares to help you find the best deals effortlessly

Cheapest flights

From price

Apr

30 6
6 13
13 20
20 27
May

27 4
4 11
11 18
18 25
Jun

25 1
1 8
8 15
15 22

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

When are flight tickets from San Jose (SJI) to Ontario (ONT) the cheapest?

Airlines adjust prices for flights from San Jose to Ontario based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much do flights from San Jose (SJI) to Ontario (ONT) cost?

According to Trip.com's data, the lowest price is around Rp 13,452,585.

How to find a cheap flight from San Jose to Ontario

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from San Jose to Ontario. Book your flights at the right time and save more.

Be flexible with your travel dates to get the cheapest San Jose to Ontario ticket.

Tap "Date" on flight search bar to get the calender for San Jose to Ontario airfare over next 6 months in 2025.

Compare cheap San Jose to Ontario flight deals from hundreds of airlines.

Compare prices from over 500 airlines with our powerful search and find the cheapest flight tickets from San Jose to Ontario.

Set up a Price Alert to track fare drops.

Set up a Price Alert for your San Jose to Ontario route to track ticket prices effortlessly—no need to check manually every day.

Don't miss out on cheap San Jose to Ontario flight deals and promo codes.

Stay updated on the latest deals with Trip.com Deals and Promo Codes for cheap flights. Sign up for a free membership to unlock even more exclusive flight discounts.

Book early or wait unitl the last minute to fine the best fares.

It's always better to book early! Airlines typically release their lowest fares about a year before departure, so check as soon as flights become available. If you miss that window, you may still find great deals closer to your travel date.

Search for flights on the go.

For the best booking experience on the go, download Trip.com and search for cheap flights from San Jose to Ontario to access exclusive deals just for you.