Cheapest return flights from Ontario to San Jose in December from $565

Best time to book flights for Ontario (ONT) to San Jose (SJO) flights at AirHint

AirHint found the following cheapest return flights from Ontario (ONT) to San Jose (SJO) in December 2025 (see full year).

Return flights

03 Dec - 09 Dec Southwest Airlines
09 Dec - 24 Dec Southwest Airlines
08 Dec - 23 Dec Southwest Airlines
03 Dec - 08 Dec Southwest Airlines
07 Dec - 22 Dec Southwest Airlines
01 Dec - 22 Dec Southwest Airlines
15 Dec - 22 Dec Southwest Airlines
26 Dec - 05 Jan Southwest Airlines
26 Dec - 04 Jan Southwest Airlines

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

Skyscanner

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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