AirHint found the following cheapest return flights from St. Louis (STL) to San Juan (SJU) in November 2025 (see full year).
Return flights
| 08 Nov - 12 Nov | United | ||
| 16 Nov - 19 Nov | United | ||
| 14 Nov - 22 Nov | Frontier Airlines | ||
| 03 Nov - 07 Nov | Frontier Airlines | ||
| 22 Nov - 05 Dec | Frontier Airlines |
Also check the deals for one-way flights from St. Louis to San Juan in November.
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