| Kotka to Popovo | 1,183.02 mi (1,903.88 km) |
| Kotka to Provadia | 1,194.34 mi (1,922.11 km) |
| Kotka to Radnevo | 1,255.91 mi (2,021.20 km) |
| Kotka to Radomir | 1,249.21 mi (2,010.41 km) |
| Kotka to Rakitovo | 1,282.76 mi (2,064.40 km) |
| Kotka to Rakovski | 1,258.75 mi (2,025.76 km) |
| Kotka to Razgrad | 1,170.12 mi (1,883.12 km) |
| Kotka to Razlog | 1,292.34 mi (2,079.83 km) |
| Kotka to Ruse | 1,150.69 mi (1,851.86 km) |
| Kotka to Samokov | 1,260.70 mi (2,028.90 km) |
| Kotka to Sandanski | 1,314.93 mi (2,116.17 km) |
| Kotka to Sevlievo | 1,207.48 mi (1,943.26 km) |
| Kotka to Shumen | 1,187.26 mi (1,910.71 km) |
| Kotka to Silistra | 1,129.72 mi (1,818.11 km) |
| Kotka to Sliven | 1,228.98 mi (1,977.85 km) |
