Cheapest return flights from Ontario to San Jose in May from $430

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

Return flights

12 May - 16 May Avianca
02 May - 09 May Avianca
05 May - 12 May Avianca
03 May - 19 May Southwest Airlines
28 May - 01 Jun Avianca
24 May - 27 May jetBlue
07 May - 11 May Avianca
04 May - 11 May Southwest Airlines
23 May - 30 May jetBlue
18 May - 24 May Southwest Airlines
15 May - 22 May Southwest Airlines
26 May - 23 Jun Southwest Airlines
29 May - 07 Jun Southwest Airlines
28 May - 04 Jun Southwest Airlines

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

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