| Southborough to Islahiye | 2,023.43 mi (3,256.40 km) |
| Southborough to Isparta | 1,738.55 mi (2,797.93 km) |
| Southborough to Istanbul | 1,529.73 mi (2,461.87 km) |
| Southborough to Izmir | 1,570.72 mi (2,527.83 km) |
| Southborough to Kadinhani | 1,784.79 mi (2,872.34 km) |
| Southborough to Kadirli | 1,985.59 mi (3,195.50 km) |
| Southborough to Kagithane | 1,527.79 mi (2,458.74 km) |
| Southborough to Kahramanmaras | 2,011.15 mi (3,236.64 km) |
| Southborough to Kahta | 2,074.00 mi (3,337.78 km) |
| Southborough to Kaman | 1,799.07 mi (2,895.33 km) |
| Southborough to Kangal | 1,959.47 mi (3,153.47 km) |
| Southborough to Kapakli | 1,475.36 mi (2,374.37 km) |
| Southborough to Karaagac | 2,023.21 mi (3,256.04 km) |
| Southborough to Karaagac | 1,476.05 mi (2,375.47 km) |
| Southborough to Karabuk | 1,676.72 mi (2,698.42 km) |
