Cheapest return flights from Ontario to San Jose in May from $404

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

Return flights

12 May - 19 May Avianca
07 May - 19 May Southwest Airlines
04 May - 11 May Southwest Airlines
03 May - 15 May Southwest Airlines
04 May - 15 May Southwest Airlines
08 May - 11 May Southwest Airlines
02 May - 09 May Southwest Airlines
19 May - 31 May Southwest Airlines
02 May - 15 May Southwest Airlines
01 May - 03 May Southwest Airlines
29 May - 07 Jun Southwest Airlines
24 May - 04 Jun Southwest Airlines
24 May - 06 Jun Southwest Airlines
22 May - 01 Jun Southwest Airlines
21 May - 01 Jun Southwest Airlines

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

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