| South Portland to Islahiye | 5,229.21 mi (8,415.59 km) |
| South Portland to Isparta | 4,950.18 mi (7,966.54 km) |
| South Portland to Istanbul | 4,738.96 mi (7,626.62 km) |
| South Portland to Izmir | 4,779.76 mi (7,692.28 km) |
| South Portland to Kadinhani | 4,995.45 mi (8,039.40 km) |
| South Portland to Kadirli | 5,191.51 mi (8,354.93 km) |
| South Portland to Kagithane | 4,736.83 mi (7,623.20 km) |
| South Portland to Kahramanmaras | 5,213.95 mi (8,391.04 km) |
| South Portland to Kahta | 5,269.87 mi (8,481.03 km) |
| South Portland to Kaman | 5,003.65 mi (8,052.59 km) |
| South Portland to Kangal | 5,151.68 mi (8,290.82 km) |
| South Portland to Kapakli | 4,685.28 mi (7,540.22 km) |
| South Portland to Karaagac | 5,231.48 mi (8,419.26 km) |
| South Portland to Karaagac | 4,686.06 mi (7,541.49 km) |
| South Portland to Karabuk | 4,875.48 mi (7,846.32 km) |
