| Waltham to Popovo | 4,619.91 mi (7,435.02 km) |
| Waltham to Provadia | 4,674.80 mi (7,523.36 km) |
| Waltham to Radnevo | 4,651.80 mi (7,486.35 km) |
| Waltham to Radomir | 4,519.43 mi (7,273.33 km) |
| Waltham to Rakitovo | 4,589.32 mi (7,385.79 km) |
| Waltham to Rakovski | 4,612.88 mi (7,423.72 km) |
| Waltham to Razgrad | 4,623.56 mi (7,440.90 km) |
| Waltham to Razlog | 4,567.95 mi (7,351.41 km) |
| Waltham to Ruse | 4,589.05 mi (7,385.36 km) |
| Waltham to Samokov | 4,553.04 mi (7,327.42 km) |
| Waltham to Sandanski | 4,573.22 mi (7,359.89 km) |
| Waltham to Sevlievo | 4,588.33 mi (7,384.21 km) |
| Waltham to Shumen | 4,650.66 mi (7,484.52 km) |
| Waltham to Silistra | 4,628.53 mi (7,448.89 km) |
| Waltham to Sliven | 4,651.87 mi (7,486.47 km) |
