| Groningen to Smolyan | 1,162.22 mi (1,870.41 km) |
| Groningen to Sofia | 1,057.97 mi (1,702.64 km) |
| Groningen to Sopot | 1,108.54 mi (1,784.02 km) |
| Groningen to Sozopol | 1,224.32 mi (1,970.36 km) |
| Groningen to Sredets | 1,209.59 mi (1,946.65 km) |
| Groningen to Stamboliyski | 1,127.78 mi (1,814.98 km) |
| Groningen to Stara Zagora | 1,150.66 mi (1,851.81 km) |
| Groningen to Svilengrad | 1,203.64 mi (1,937.07 km) |
| Groningen to Svishtov | 1,081.58 mi (1,740.64 km) |
| Groningen to Targovishte | 1,143.62 mi (1,840.47 km) |
| Groningen to Teteven | 1,078.39 mi (1,735.50 km) |
| Groningen to Troyan | 1,095.57 mi (1,763.14 km) |
| Groningen to Tryavna | 1,123.69 mi (1,808.40 km) |
| Groningen to Tutrakan | 1,107.15 mi (1,781.79 km) |
| Groningen to Varna | 1,193.98 mi (1,921.53 km) |
