Cheap flights from Ontario to San Jose

One-way fares from $362 · ONT → SJO · prices found by travellers in the last 48 hours

Compare all dates San Jose → Ontario
Cheapest fare
$362

United Airlines · Tue, Dec 1

Cheapest month
December

from $362

Direct flights
Not recently

Usually 1+ stop

Quickest trip
6h 52m

4,340 km

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Cheapest month to fly from Ontario to San Jose

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $373
  2. December 2026 Cheapest $362
  3. January 2027 $381

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Where to stay, what to do and getting around, from our travel partners.

Where to stay

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Things to do

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Getting around

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About flights from Ontario to San Jose

Ontario (ONT) and San Jose (SJO) are about 4,340 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 6h 52m. Over the next few months, one-way fares start from $362, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Ontario to San Jose?

The cheapest one-way fare we've seen recently is $362 with United Airlines, departing Tuesday, December 1, 2026. Over the coming months, the lowest fare in each month ranges from $362 to $381.

What is the cheapest month to fly from Ontario to San Jose?

December 2026 currently has the lowest fares, from $362 one way.

Are there direct flights from Ontario to San Jose?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Ontario to San Jose?

The quickest journey we've seen takes about 6h 52m. Ontario and San Jose are around 4,340 km apart.

Which airlines fly from Ontario to San Jose?

Recent fares on this route were with United Airlines.

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