| Viareggio to Smolyan | 749.15 mi (1,205.63 km) |
| Viareggio to Sofia | 662.08 mi (1,065.51 km) |
| Viareggio to Sopot | 733.46 mi (1,180.39 km) |
| Viareggio to Sozopol | 883.73 mi (1,422.22 km) |
| Viareggio to Sredets | 859.83 mi (1,383.76 km) |
| Viareggio to Stamboliyski | 730.64 mi (1,175.86 km) |
| Viareggio to Stara Zagora | 781.39 mi (1,257.52 km) |
| Viareggio to Svilengrad | 819.92 mi (1,319.54 km) |
| Viareggio to Svishtov | 752.87 mi (1,211.63 km) |
| Viareggio to Targovishte | 817.55 mi (1,315.73 km) |
| Viareggio to Teteven | 705.92 mi (1,136.07 km) |
| Viareggio to Troyan | 728.75 mi (1,172.81 km) |
| Viareggio to Tryavna | 767.97 mi (1,235.93 km) |
| Viareggio to Tutrakan | 812.75 mi (1,307.99 km) |
| Viareggio to Varna | 884.24 mi (1,423.04 km) |
