Cheapest one-way flights from Ontario to San Jose in April from $249

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in April 2026 (see full year).

One-Way flights

07 Apr Southwest Airlines
20 Apr Southwest Airlines

Also check the deals for return flights from Ontario to San Jose in April.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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