AirHint found the following cheapest one-way flights from St. Louis (STL) to San Juan (SJU) in October 2025 (see full year).
One-Way flights
| 12 Oct | American Airlines | ||
| 19 Oct | Spirit Airlines | ||
| 18 Oct | Spirit Airlines | ||
| 17 Oct | Frontier Airlines | ||
| 09 Oct | Spirit Airlines | ||
| 05 Oct | Delta |
Also check the deals for return flights from St. Louis to San Juan in October.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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