AirHint found the following cheapest return flights from Louisville (SDF) to San Juan (SJU) in April 2026 (see full year).
Return flights
| 25 Apr - 02 May | American Airlines | ||
| 07 Apr - 14 Apr | Southwest Airlines | ||
| 03 Apr - 07 Apr | Southwest Airlines | ||
| 04 Apr - 11 Apr | Allegiant Air |
Also check the deals for one-way flights from Louisville to San Juan in April.
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