| | IATA | ICAO | City | Region | State | Country | | SLW | | Saltillo | | Coahuila | Mexico |
| SLZ | | Sao Luiz | | Maranhao | Brazil |
| SMF | | Sacramento | | CALIFORNIA | USA |
| SML | | Stella Maris | | Bahamas | USA |
| SMM | | Semporna Sabah | | | Malaysia |
| SMS | | St Marie | | | Madagascar |
| SMX | | Santa Maria | | CALIFORNIA | USA |
| SNA | | Santa Ana | | CALIFORNIA | USA |
| SNB | | Snake Bay | | Northern Territory | Australia |
| SNN | | Shannon | | | Ireland |
| SNO | | Sakon Nakhon | | | Thailand |
| SOF | | Sofia | | | Bulgaria |
| SOG | | Sogndal | | | Norway |
| SOM | | San Tome | | | Venezuela |
| SOP | | Southern Pines | | NORTH CAROLINA | USA |
| SOU | | Southampton | | England | Great Britain |
| SOW | | Show Low | | ARIZONA | USA |
| SPB | | St Thomas Island | | VIRGIN ISLANDS | USA |
| SPC | | Santa Cruz | Canary Islands | La Palma | Spain |
| SPD | | Saidpur | | | Bangladesh |
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