| South Portland to Prokuplje | 4,346.69 mi (6,995.32 km) |
| South Portland to Raca | 4,282.22 mi (6,891.57 km) |
| South Portland to Raska | 4,304.56 mi (6,927.52 km) |
| South Portland to Razanj | 4,327.83 mi (6,964.96 km) |
| South Portland to Rekovac | 4,302.87 mi (6,924.80 km) |
| South Portland to Ruma | 4,205.61 mi (6,768.28 km) |
| South Portland to Sabac | 4,209.41 mi (6,774.39 km) |
| South Portland to Secanj | 4,229.21 mi (6,806.25 km) |
| South Portland to Senta | 4,180.05 mi (6,727.14 km) |
| South Portland to Sid | 4,176.80 mi (6,721.91 km) |
| South Portland to Sjenica | 4,280.22 mi (6,888.34 km) |
| South Portland to Smederevo | 4,263.05 mi (6,860.72 km) |
| South Portland to Smederevska Palanka | 4,276.00 mi (6,881.56 km) |
| South Portland to Sokobanja | 4,341.38 mi (6,986.77 km) |
| South Portland to Sombor | 4,146.66 mi (6,673.41 km) |
