| Holyhead to Popovo | 1,559.61 mi (2,509.95 km) |
| Holyhead to Provadia | 1,614.78 mi (2,598.74 km) |
| Holyhead to Radnevo | 1,592.36 mi (2,562.66 km) |
| Holyhead to Radomir | 1,464.03 mi (2,356.13 km) |
| Holyhead to Rakitovo | 1,533.55 mi (2,468.01 km) |
| Holyhead to Rakovski | 1,554.60 mi (2,501.88 km) |
| Holyhead to Razgrad | 1,563.42 mi (2,516.08 km) |
| Holyhead to Razlog | 1,514.07 mi (2,436.67 km) |
| Holyhead to Ruse | 1,528.90 mi (2,460.53 km) |
| Holyhead to Samokov | 1,497.12 mi (2,409.38 km) |
| Holyhead to Sandanski | 1,521.34 mi (2,448.36 km) |
| Holyhead to Sevlievo | 1,528.53 mi (2,459.93 km) |
| Holyhead to Shumen | 1,590.51 mi (2,559.67 km) |
| Holyhead to Silistra | 1,569.83 mi (2,526.40 km) |
| Holyhead to Sliven | 1,591.73 mi (2,561.64 km) |
