| Delfzijl to Smolyan | 1,155.50 mi (1,859.61 km) |
| Delfzijl to Sofia | 1,051.31 mi (1,691.92 km) |
| Delfzijl to Sopot | 1,101.15 mi (1,772.13 km) |
| Delfzijl to Sozopol | 1,215.70 mi (1,956.48 km) |
| Delfzijl to Sredets | 1,201.22 mi (1,933.18 km) |
| Delfzijl to Stamboliyski | 1,120.82 mi (1,803.79 km) |
| Delfzijl to Stara Zagora | 1,142.96 mi (1,839.42 km) |
| Delfzijl to Svilengrad | 1,196.07 mi (1,924.88 km) |
| Delfzijl to Svishtov | 1,073.28 mi (1,727.27 km) |
| Delfzijl to Targovishte | 1,134.98 mi (1,826.57 km) |
| Delfzijl to Teteven | 1,071.08 mi (1,723.74 km) |
| Delfzijl to Troyan | 1,088.05 mi (1,751.04 km) |
| Delfzijl to Tryavna | 1,115.79 mi (1,795.69 km) |
| Delfzijl to Tutrakan | 1,097.99 mi (1,767.05 km) |
| Delfzijl to Varna | 1,184.80 mi (1,906.75 km) |
