| Grimbergen to Provadia | 1,203.05 mi (1,936.12 km) |
| Grimbergen to Radnevo | 1,177.55 mi (1,895.09 km) |
| Grimbergen to Radomir | 1,048.19 mi (1,686.90 km) |
| Grimbergen to Rakitovo | 1,117.73 mi (1,798.81 km) |
| Grimbergen to Rakovski | 1,139.21 mi (1,833.37 km) |
| Grimbergen to Razgrad | 1,151.38 mi (1,852.97 km) |
| Grimbergen to Razlog | 1,098.23 mi (1,767.43 km) |
| Grimbergen to Ruse | 1,116.87 mi (1,797.43 km) |
| Grimbergen to Samokov | 1,081.30 mi (1,740.19 km) |
| Grimbergen to Sandanski | 1,105.63 mi (1,779.33 km) |
| Grimbergen to Sevlievo | 1,114.06 mi (1,792.90 km) |
| Grimbergen to Shumen | 1,178.39 mi (1,896.44 km) |
| Grimbergen to Silistra | 1,160.45 mi (1,867.57 km) |
| Grimbergen to Sliven | 1,177.79 mi (1,895.47 km) |
| Grimbergen to Smolyan | 1,159.84 mi (1,866.58 km) |
