Cheapest return flights from Ontario to San Juan in May from 356€

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

Return flights

01 May - 06 May Southwest Airlines
02 May - 06 May Southwest Airlines
01 May - 08 May Southwest Airlines
02 May - 05 May Southwest Airlines
03 May - 06 May Southwest Airlines
01 May - 05 May Southwest Airlines
17 May - 22 May Southwest Airlines
10 May - 20 May Southwest Airlines
05 May - 11 May Southwest Airlines
31 May - 04 Jun Southwest Airlines
16 May - 19 May Southwest Airlines
29 May - 06 Jun Southwest Airlines
27 May - 03 Jun Southwest Airlines
29 May - 08 Jun Southwest Airlines

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

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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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