Cheapest return flights from Ontario to San Jose in October from 347€

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

Return flights

14 Oct - 21 Oct Southwest Airlines
30 Oct - 05 Nov Southwest Airlines
01 Oct - 15 Oct Southwest Airlines
31 Oct - 11 Nov Southwest Airlines
31 Oct - 08 Nov Southwest Airlines
18 Oct - 23 Oct Southwest Airlines
16 Oct - 24 Oct Southwest Airlines
13 Oct - 20 Oct Southwest Airlines
11 Oct - 23 Oct Southwest Airlines
10 Oct - 28 Oct Southwest Airlines
11 Oct - 26 Oct Southwest Airlines
12 Oct - 24 Oct Southwest Airlines
09 Oct - 27 Oct Southwest Airlines
30 Oct - 29 Nov Southwest Airlines

Also check the deals for one-way 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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