Cheapest return flights from Ontario to San Jose in May from 334€

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

Return flights

14 May - 21 May Avianca
15 May - 19 May Southwest Airlines
15 May - 22 May Southwest Airlines
16 May - 22 May Southwest Airlines
20 May - 27 May Southwest Airlines
02 May - 09 May Southwest Airlines
18 May - 25 May Southwest Airlines
25 May - 03 Jun Southwest Airlines
29 May - 06 Jun Southwest Airlines
17 May - 21 May Southwest Airlines
22 May - 25 May Southwest Airlines
24 May - 03 Jun Southwest Airlines
24 May - 02 Jun Southwest Airlines
17 May - 24 May Southwest Airlines
24 May - 04 Jun Southwest Airlines
29 May - 08 Jun Southwest Airlines
29 May - 07 Jun Southwest Airlines
28 May - 08 Jun Southwest Airlines
28 May - 07 Jun Southwest Airlines
04 May - 19 Jun Southwest Airlines

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

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