| Abbreviation | Definition |
|---|---|
| STM | Santarem, PA, Brazil |
| STN | Stansted Airport, London, England, UK |
| STO | Stockholm, Sweden |
| STQ | St. Marys, Pennsylvania USA |
| STR | Echterdingen Airport, Stuttgart, Germany |
| STS | Charles M. Schulz Airport (Sonoma County Airport), Santa Rosa, California USA |
| STT | Cyril E. King Airport, St. Thomas, Virgin Islands |
| STU | Santa Cruz, Belize |
| STV | Surat, India |
| STW | Stavropol, Russia |
| STX | St. Croix, Virgin Islands |
| STY | Salto, Uruguay |
| STZ | Santa Terezinha, MT, Brazil |
| SUA | Stuart, Florida USA |
| SUAA | Montevideo Angel San Adami, Uruguay |
| SUAG | Artigas, Uruguay |
| SUB | Surabaya, Indonesia |
| SUCA | Colonia, Uruguay |
| SUD | Stroud Airport, Stroud, Oklahoma USA |
| SUDU | Durazno-Santa Bernardina, Uruguay |