| Porvoo to Smolyan | 1,300.36 mi (2,092.73 km) |
| Porvoo to Sofia | 1,226.48 mi (1,973.83 km) |
| Porvoo to Sopot | 1,226.62 mi (1,974.05 km) |
| Porvoo to Sozopol | 1,245.09 mi (2,003.78 km) |
| Porvoo to Sredets | 1,248.42 mi (2,009.14 km) |
| Porvoo to Stamboliyski | 1,262.62 mi (2,031.99 km) |
| Porvoo to Stara Zagora | 1,240.99 mi (1,997.18 km) |
| Porvoo to Svilengrad | 1,287.25 mi (2,071.63 km) |
| Porvoo to Svishtov | 1,159.30 mi (1,865.71 km) |
| Porvoo to Targovishte | 1,185.19 mi (1,907.37 km) |
| Porvoo to Teteven | 1,209.01 mi (1,945.71 km) |
| Porvoo to Troyan | 1,210.55 mi (1,948.19 km) |
| Porvoo to Tryavna | 1,211.05 mi (1,949.00 km) |
| Porvoo to Tutrakan | 1,129.98 mi (1,818.53 km) |
| Porvoo to Varna | 1,190.59 mi (1,916.07 km) |
