| Alpena to Sestu | 4,483.72 mi (7,215.86 km) |
| Alpena to Settimo Torinese | 4,185.18 mi (6,735.40 km) |
| Alpena to Seveso | 4,218.21 mi (6,788.55 km) |
| Alpena to Sezze | 4,549.43 mi (7,321.60 km) |
| Alpena to Siano | 4,645.21 mi (7,475.74 km) |
| Alpena to Siena | 4,401.57 mi (7,083.64 km) |
| Alpena to Signa | 4,372.61 mi (7,037.04 km) |
| Alpena to Silea | 4,339.53 mi (6,983.81 km) |
| Alpena to Silvi Paese | 4,544.40 mi (7,313.51 km) |
| Alpena to Sinalunga | 4,421.77 mi (7,116.16 km) |
| Alpena to Siniscola | 4,453.62 mi (7,167.42 km) |
| Alpena to Sinnai | 4,488.22 mi (7,223.09 km) |
| Alpena to Siracusa | 4,839.66 mi (7,788.68 km) |
| Alpena to Solaro | 4,217.29 mi (6,787.07 km) |
| Alpena to Soliera | 4,325.35 mi (6,960.98 km) |
