| Dubuque to Popovo | 5,336.78 mi (8,588.72 km) |
| Dubuque to Provadia | 5,385.75 mi (8,667.53 km) |
| Dubuque to Radnevo | 5,380.13 mi (8,658.48 km) |
| Dubuque to Radomir | 5,263.35 mi (8,470.54 km) |
| Dubuque to Rakitovo | 5,331.69 mi (8,580.52 km) |
| Dubuque to Rakovski | 5,347.21 mi (8,605.50 km) |
| Dubuque to Razgrad | 5,336.98 mi (8,589.05 km) |
| Dubuque to Razlog | 5,314.88 mi (8,553.47 km) |
| Dubuque to Ruse | 5,303.23 mi (8,534.73 km) |
| Dubuque to Samokov | 5,295.34 mi (8,522.03 km) |
| Dubuque to Sandanski | 5,324.05 mi (8,568.24 km) |
| Dubuque to Sevlievo | 5,315.03 mi (8,553.72 km) |
| Dubuque to Shumen | 5,363.82 mi (8,632.23 km) |
| Dubuque to Silistra | 5,331.88 mi (8,580.83 km) |
| Dubuque to Sliven | 5,374.26 mi (8,649.03 km) |
