| Sint-Niklaas to Provadia | 1,218.28 mi (1,960.63 km) |
| Sint-Niklaas to Radnevo | 1,193.70 mi (1,921.07 km) |
| Sint-Niklaas to Radomir | 1,065.10 mi (1,714.11 km) |
| Sint-Niklaas to Rakitovo | 1,134.57 mi (1,825.91 km) |
| Sint-Niklaas to Rakovski | 1,155.64 mi (1,859.83 km) |
| Sint-Niklaas to Razgrad | 1,166.68 mi (1,877.58 km) |
| Sint-Niklaas to Razlog | 1,115.30 mi (1,794.90 km) |
| Sint-Niklaas to Ruse | 1,132.16 mi (1,822.03 km) |
| Sint-Niklaas to Samokov | 1,098.13 mi (1,767.27 km) |
| Sint-Niklaas to Sandanski | 1,122.88 mi (1,807.10 km) |
| Sint-Niklaas to Sevlievo | 1,130.06 mi (1,818.66 km) |
| Sint-Niklaas to Shumen | 1,193.71 mi (1,921.09 km) |
| Sint-Niklaas to Silistra | 1,175.17 mi (1,891.25 km) |
| Sint-Niklaas to Sliven | 1,193.62 mi (1,920.94 km) |
| Sint-Niklaas to Smolyan | 1,176.68 mi (1,893.68 km) |
