Cheapest return flights from Ontario to San Jose in August from $511

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

Return flights

27 Aug - 07 Sep Avianca
01 Aug - 08 Aug Avianca
11 Aug - 01 Sep Southwest Airlines
05 Aug - 12 Aug Southwest Airlines
03 Aug - 17 Aug Southwest Airlines
26 Aug - 30 Aug Southwest Airlines
02 Aug - 08 Aug jetBlue
09 Aug - 30 Aug Southwest Airlines

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

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