AirHint found the following cheapest return flights from St. Louis (STL) to San Juan (SJU) in January 2026 (see full year).
Return flights
| 05 Jan - 09 Jan | Frontier Airlines | ||
| 07 Jan - 18 Jan | Frontier Airlines | ||
| 16 Jan - 22 Jan | Southwest Airlines |
Also check the deals for one-way flights from St. Louis to San Juan in January.
Powered by
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.
Find us on social media