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

Return flights

21 Jan - 28 Jan	Southwest Airlines
12 Jan - 19 Jan	Southwest Airlines
08 Jan - 13 Jan	Southwest Airlines
10 Jan - 23 Jan	Southwest Airlines
05 Jan - 08 Jan	Southwest Airlines
15 Jan - 18 Jan	Southwest Airlines

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

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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Cheapest return flights from Ontario to San Jose in January from 409€

Return flights