| Ottawa to Smolyan | 5,362.94 mi (8,630.82 km) |
| Ottawa to Sofia | 5,258.78 mi (8,463.19 km) |
| Ottawa to Sopot | 5,312.51 mi (8,549.66 km) |
| Ottawa to Sozopol | 5,428.60 mi (8,736.49 km) |
| Ottawa to Sredets | 5,414.42 mi (8,713.67 km) |
| Ottawa to Stamboliyski | 5,329.96 mi (8,577.74 km) |
| Ottawa to Stara Zagora | 5,355.37 mi (8,618.64 km) |
| Ottawa to Svilengrad | 5,408.05 mi (8,703.41 km) |
| Ottawa to Svishtov | 5,286.50 mi (8,507.80 km) |
| Ottawa to Targovishte | 5,347.89 mi (8,606.60 km) |
| Ottawa to Teteven | 5,282.15 mi (8,500.79 km) |
| Ottawa to Troyan | 5,299.92 mi (8,529.39 km) |
| Ottawa to Tryavna | 5,328.66 mi (8,575.64 km) |
| Ottawa to Tutrakan | 5,309.33 mi (8,544.54 km) |
| Ottawa to Varna | 5,395.87 mi (8,683.81 km) |
