| Niagara Falls to Selargius | 4,369.32 mi (7,031.73 km) |
| Niagara Falls to Selvazzano Dentro | 4,240.25 mi (6,824.02 km) |
| Niagara Falls to Senago | 4,125.06 mi (6,638.64 km) |
| Niagara Falls to Senigallia | 4,363.76 mi (7,022.80 km) |
| Niagara Falls to Seravezza | 4,229.81 mi (6,807.22 km) |
| Niagara Falls to Seregno | 4,125.32 mi (6,639.06 km) |
| Niagara Falls to Seriate | 4,145.14 mi (6,670.96 km) |
| Niagara Falls to Sermoneta | 4,440.86 mi (7,146.88 km) |
| Niagara Falls to Serramanna | 4,352.15 mi (7,004.11 km) |
| Niagara Falls to Serravalle Pistoiese | 4,258.46 mi (6,853.34 km) |
| Niagara Falls to Sessa Aurunca | 4,493.53 mi (7,231.64 km) |
| Niagara Falls to Sesto Calende | 4,099.10 mi (6,596.86 km) |
| Niagara Falls to Sesto Fiorentino | 4,276.18 mi (6,881.85 km) |
| Niagara Falls to Sesto San Giovanni | 4,130.99 mi (6,648.19 km) |
| Niagara Falls to Sestri Levante | 4,184.63 mi (6,734.50 km) |
