Cheapest return flights from Ontario to San Jose in April from 355€

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

Return flights

21 Apr - 28 Apr Southwest Airlines
15 Apr - 22 Apr Southwest Airlines
28 Apr - 03 May Southwest Airlines
21 Apr - 25 Apr Southwest Airlines
30 Apr - 03 May Southwest Airlines
02 Apr - 06 Apr Southwest Airlines
10 Apr - 13 Apr Southwest Airlines
18 Apr - 03 May Southwest Airlines
01 Apr - 06 Apr Southwest Airlines
12 Apr - 18 Apr Southwest Airlines
16 Apr - 26 Apr Southwest Airlines
02 Apr - 09 Apr Southwest Airlines
08 Apr - 12 Apr Southwest Airlines

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

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