| Kouvola to Popovo | 1,210.54 mi (1,948.18 km) |
| Kouvola to Provadia | 1,222.28 mi (1,967.06 km) |
| Kouvola to Radnevo | 1,283.34 mi (2,065.33 km) |
| Kouvola to Radomir | 1,275.32 mi (2,052.42 km) |
| Kouvola to Rakitovo | 1,309.44 mi (2,107.33 km) |
| Kouvola to Rakovski | 1,285.79 mi (2,069.28 km) |
| Kouvola to Razgrad | 1,197.74 mi (1,927.58 km) |
| Kouvola to Razlog | 1,318.74 mi (2,122.31 km) |
| Kouvola to Ruse | 1,178.10 mi (1,895.97 km) |
| Kouvola to Samokov | 1,287.12 mi (2,071.42 km) |
| Kouvola to Sandanski | 1,341.26 mi (2,158.54 km) |
| Kouvola to Sevlievo | 1,234.57 mi (1,986.85 km) |
| Kouvola to Shumen | 1,215.03 mi (1,955.40 km) |
| Kouvola to Silistra | 1,157.60 mi (1,862.98 km) |
| Kouvola to Sliven | 1,256.54 mi (2,022.21 km) |
