AirHint found the following cheapest return flights from Grand Rapids (GRR) to San Juan (SJU) in January 2026 (see full year).
Return flights
| 24 Jan - 31 Jan | Frontier Airlines | ||
| 11 Jan - 15 Jan | Frontier Airlines | ||
| 09 Jan - 13 Jan | Allegiant Air | ||
| 25 Jan - 01 Feb | Allegiant Air | ||
| 02 Jan - 09 Jan | United |
Also check the deals for one-way flights from Grand Rapids to San Juan in January.
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