Cheapest one-way flights from Ontario to San Jose in March from $159

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in March 2026 (see full year).

One-Way flights

10 Mar Frontier Airlines
11 Mar United
17 Mar Frontier Airlines
03 Mar Southwest Airlines
25 Mar Frontier Airlines
02 Mar Southwest Airlines
12 Mar Avianca
26 Mar Frontier Airlines
23 Mar Frontier Airlines
14 Mar Avianca

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

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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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