AirHint found the following cheapest one-way flights from Ontario (ONT) to San Juan (SJU) in April 2026 (see full year).
One-Way flights
| 20 Apr | Southwest Airlines | ||
| 29 Apr | Southwest Airlines | ||
| 17 Apr | Southwest Airlines | ||
| 05 Apr | Southwest Airlines |
Also check the deals for return flights from Ontario to San Juan in April.
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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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