| Oak Harbor to Smolyan | 5,914.81 mi (9,518.97 km) |
| Oak Harbor to Sofia | 5,817.27 mi (9,362.00 km) |
| Oak Harbor to Sopot | 5,846.98 mi (9,409.80 km) |
| Oak Harbor to Sozopol | 5,913.96 mi (9,517.61 km) |
| Oak Harbor to Sredets | 5,909.82 mi (9,510.93 km) |
| Oak Harbor to Stamboliyski | 5,876.28 mi (9,456.95 km) |
| Oak Harbor to Stara Zagora | 5,877.27 mi (9,458.55 km) |
| Oak Harbor to Svilengrad | 5,930.26 mi (9,543.83 km) |
| Oak Harbor to Svishtov | 5,795.41 mi (9,326.82 km) |
| Oak Harbor to Targovishte | 5,840.72 mi (9,399.73 km) |
| Oak Harbor to Teteven | 5,820.92 mi (9,367.86 km) |
| Oak Harbor to Troyan | 5,831.33 mi (9,384.63 km) |
| Oak Harbor to Tryavna | 5,846.54 mi (9,409.10 km) |
| Oak Harbor to Tutrakan | 5,789.35 mi (9,317.06 km) |
| Oak Harbor to Varna | 5,865.39 mi (9,439.43 km) |
