| Hertford to Popovo | 1,348.25 mi (2,169.79 km) |
| Hertford to Provadia | 1,404.41 mi (2,260.18 km) |
| Hertford to Radnevo | 1,378.73 mi (2,218.85 km) |
| Hertford to Radomir | 1,248.21 mi (2,008.80 km) |
| Hertford to Rakitovo | 1,317.89 mi (2,120.93 km) |
| Hertford to Rakovski | 1,340.06 mi (2,156.62 km) |
| Hertford to Razgrad | 1,352.77 mi (2,177.07 km) |
| Hertford to Razlog | 1,297.85 mi (2,088.69 km) |
| Hertford to Ruse | 1,318.25 mi (2,121.52 km) |
| Hertford to Samokov | 1,281.49 mi (2,062.36 km) |
| Hertford to Sandanski | 1,304.69 mi (2,099.70 km) |
| Hertford to Sevlievo | 1,315.34 mi (2,116.84 km) |
| Hertford to Shumen | 1,379.78 mi (2,220.55 km) |
| Hertford to Silistra | 1,361.47 mi (2,191.07 km) |
| Hertford to Sliven | 1,379.16 mi (2,219.54 km) |
