Cheapest one-way flights from Ontario to San Jose in October from $154

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in October 2025 (see full year).

One-Way flights

28 Oct Avianca
20 Oct Southwest Airlines
04 Oct Avianca
03 Oct Frontier Airlines
30 Oct Avianca
29 Oct Southwest Airlines
01 Oct Southwest Airlines
19 Oct Southwest Airlines
22 Oct Southwest Airlines
15 Oct Southwest Airlines

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

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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