| Delaware to Popovo | 5,175.33 mi (8,328.89 km) |
| Delaware to Provadia | 5,227.83 mi (8,413.38 km) |
| Delaware to Radnevo | 5,212.36 mi (8,388.48 km) |
| Delaware to Radomir | 5,086.19 mi (8,185.42 km) |
| Delaware to Rakitovo | 5,155.67 mi (8,297.25 km) |
| Delaware to Rakovski | 5,175.88 mi (8,329.77 km) |
| Delaware to Razgrad | 5,177.47 mi (8,332.34 km) |
| Delaware to Razlog | 5,136.17 mi (8,265.86 km) |
| Delaware to Ruse | 5,143.15 mi (8,277.11 km) |
| Delaware to Samokov | 5,119.23 mi (8,238.61 km) |
| Delaware to Sandanski | 5,143.11 mi (8,277.03 km) |
| Delaware to Sevlievo | 5,147.93 mi (8,284.79 km) |
| Delaware to Shumen | 5,204.57 mi (8,375.94 km) |
| Delaware to Silistra | 5,177.98 mi (8,333.15 km) |
| Delaware to Sliven | 5,209.84 mi (8,384.43 km) |
