| Monmouth to Popovo | 1,458.17 mi (2,346.69 km) |
| Monmouth to Provadia | 1,514.77 mi (2,437.78 km) |
| Monmouth to Radnevo | 1,487.26 mi (2,393.51 km) |
| Monmouth to Radomir | 1,354.73 mi (2,180.23 km) |
| Monmouth to Rakitovo | 1,424.55 mi (2,292.59 km) |
| Monmouth to Rakovski | 1,447.88 mi (2,330.14 km) |
| Monmouth to Razgrad | 1,463.02 mi (2,354.51 km) |
| Monmouth to Razlog | 1,403.80 mi (2,259.19 km) |
| Monmouth to Ruse | 1,428.53 mi (2,299.00 km) |
| Monmouth to Samokov | 1,388.22 mi (2,234.13 km) |
| Monmouth to Sandanski | 1,409.95 mi (2,269.09 km) |
| Monmouth to Sevlievo | 1,424.22 mi (2,292.06 km) |
| Monmouth to Shumen | 1,489.99 mi (2,397.91 km) |
| Monmouth to Silistra | 1,472.59 mi (2,369.91 km) |
| Monmouth to Sliven | 1,488.40 mi (2,395.34 km) |
