AirHint found the following cheapest return flights from Sioux Falls (FSD) to San Juan (SJU) in May 2026 (see full year).
Return flights
| 01 May - 04 May | Allegiant Air | ||
| 29 May - 04 Jun | Frontier Airlines | ||
| 07 May - 11 May | United |
Also check the deals for one-way flights from Sioux Falls to San Juan in May.
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