| Waterbury to Popovo | 4,727.65 mi (7,608.42 km) |
| Waterbury to Provadia | 4,782.43 mi (7,696.58 km) |
| Waterbury to Radnevo | 4,759.77 mi (7,660.11 km) |
| Waterbury to Radomir | 4,627.61 mi (7,447.43 km) |
| Waterbury to Rakitovo | 4,697.49 mi (7,559.88 km) |
| Waterbury to Rakovski | 4,720.94 mi (7,597.62 km) |
| Waterbury to Razgrad | 4,731.23 mi (7,614.18 km) |
| Waterbury to Razlog | 4,676.19 mi (7,525.59 km) |
| Waterbury to Ruse | 4,696.73 mi (7,558.65 km) |
| Waterbury to Samokov | 4,661.21 mi (7,501.49 km) |
| Waterbury to Sandanski | 4,681.51 mi (7,534.16 km) |
| Waterbury to Sevlievo | 4,696.25 mi (7,557.89 km) |
| Waterbury to Shumen | 4,758.34 mi (7,657.80 km) |
| Waterbury to Silistra | 4,735.98 mi (7,621.82 km) |
| Waterbury to Sliven | 4,759.73 mi (7,660.05 km) |
