| Groningen to Popovo | 1,126.16 mi (1,812.38 km) |
| Groningen to Provadia | 1,177.77 mi (1,895.43 km) |
| Groningen to Radnevo | 1,167.27 mi (1,878.54 km) |
| Groningen to Radomir | 1,053.34 mi (1,695.19 km) |
| Groningen to Rakitovo | 1,120.61 mi (1,803.45 km) |
| Groningen to Rakovski | 1,134.42 mi (1,825.67 km) |
| Groningen to Razgrad | 1,127.68 mi (1,814.83 km) |
| Groningen to Razlog | 1,105.69 mi (1,779.44 km) |
| Groningen to Ruse | 1,093.48 mi (1,759.78 km) |
| Groningen to Samokov | 1,084.48 mi (1,745.31 km) |
| Groningen to Sandanski | 1,116.75 mi (1,797.24 km) |
| Groningen to Sevlievo | 1,102.22 mi (1,773.86 km) |
| Groningen to Shumen | 1,154.74 mi (1,858.37 km) |
| Groningen to Silistra | 1,127.99 mi (1,815.32 km) |
| Groningen to Sliven | 1,162.23 mi (1,870.43 km) |
