| South Portland to Zottegem | 3,362.45 mi (5,411.35 km) |
| South Portland to Zulte | 3,346.34 mi (5,385.41 km) |
| South Portland to Zwevegem | 3,345.28 mi (5,383.71 km) |
| South Portland to Zwijndrecht | 3,374.86 mi (5,431.31 km) |
| South Portland to Asenovgrad | 4,530.67 mi (7,291.42 km) |
| South Portland to Aytos | 4,597.32 mi (7,398.67 km) |
| South Portland to Balchik | 4,601.91 mi (7,406.06 km) |
| South Portland to Bankya | 4,431.62 mi (7,132.00 km) |
| South Portland to Bansko | 4,481.85 mi (7,212.85 km) |
| South Portland to Berkovitsa | 4,409.03 mi (7,095.66 km) |
| South Portland to Blagoevgrad | 4,458.26 mi (7,174.87 km) |
| South Portland to Botevgrad | 4,449.90 mi (7,161.42 km) |
| South Portland to Burgas | 4,614.56 mi (7,426.42 km) |
| South Portland to Byala Slatina | 4,432.41 mi (7,133.27 km) |
| South Portland to Chirpan | 4,541.49 mi (7,308.82 km) |
