| Biddeford to Sestu | 3,971.18 mi (6,391.00 km) |
| Biddeford to Settimo Torinese | 3,709.77 mi (5,970.29 km) |
| Biddeford to Seveso | 3,751.60 mi (6,037.62 km) |
| Biddeford to Sezze | 4,066.47 mi (6,544.35 km) |
| Biddeford to Siano | 4,163.73 mi (6,700.87 km) |
| Biddeford to Siena | 3,925.11 mi (6,316.85 km) |
| Biddeford to Signa | 3,898.75 mi (6,274.43 km) |
| Biddeford to Silea | 3,884.39 mi (6,251.32 km) |
| Biddeford to Silvi Paese | 4,072.88 mi (6,554.66 km) |
| Biddeford to Sinalunga | 3,946.06 mi (6,350.56 km) |
| Biddeford to Siniscola | 3,951.76 mi (6,359.74 km) |
| Biddeford to Sinnai | 3,976.10 mi (6,398.91 km) |
| Biddeford to Siracusa | 4,336.35 mi (6,978.68 km) |
| Biddeford to Solaro | 3,750.27 mi (6,035.47 km) |
| Biddeford to Soliera | 3,858.07 mi (6,208.97 km) |
