| North Platte to Smolyan | 5,783.51 mi (9,307.65 km) |
| North Platte to Sofia | 5,679.42 mi (9,140.15 km) |
| North Platte to Sopot | 5,727.12 mi (9,216.91 km) |
| North Platte to Sozopol | 5,830.87 mi (9,383.87 km) |
| North Platte to Sredets | 5,819.39 mi (9,365.41 km) |
| North Platte to Stamboliyski | 5,748.33 mi (9,251.05 km) |
| North Platte to Stara Zagora | 5,767.07 mi (9,281.20 km) |
| North Platte to Svilengrad | 5,820.78 mi (9,367.64 km) |
| North Platte to Svishtov | 5,693.13 mi (9,162.21 km) |
| North Platte to Targovishte | 5,750.89 mi (9,255.16 km) |
| North Platte to Teteven | 5,697.47 mi (9,169.19 km) |
| North Platte to Troyan | 5,713.40 mi (9,194.84 km) |
| North Platte to Tryavna | 5,738.69 mi (9,235.54 km) |
| North Platte to Tutrakan | 5,707.81 mi (9,185.84 km) |
| North Platte to Varna | 5,792.82 mi (9,322.65 km) |
