AirHint found the following cheapest return flights from Dublin (DUB) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 05 Dec - 10 Dec | Ryanair | ||
| 05 Dec - 14 Dec | KLM | ||
| 05 Dec - 13 Dec | Delta | ||
| 18 Dec - 27 Dec | United | ||
| 20 Dec - 21 Dec | United | ||
| 24 Dec - 02 Jan | Aer Lingus | ||
| 20 Dec - 03 Jan | Aer Lingus |
Also check the deals for one-way flights from Dublin to San Juan in December.
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