Cheapest return flights from Ontario to San Jose in May from $557

AirHint found the following cheapest return flights from Ontario (ONT) to San Jose (SJO) in May 2026 (see full year).

Return flights

07 May - 13 May Avianca
08 May - 16 May Southwest Airlines
18 May - 23 May Southwest Airlines

Also check the deals for one-way flights from Ontario to San Jose in May.

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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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