AirHint found the following cheapest one-way flights from Denver (DEN) to San Juan (SJU) in October 2025 (see full year).
One-Way flights
| 21 Oct | Frontier Airlines | ||
| 24 Oct | Frontier Airlines | ||
| 18 Oct | Frontier Airlines | ||
| 17 Oct | Frontier Airlines | ||
| 24 Oct | United | direct | |
| 18 Oct | United | direct | |
| 17 Oct | United | direct |
Also check the deals for return flights from Denver to San Juan in October.
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