| Keller to Popovo | 6,073.04 mi (9,773.62 km) |
| Keller to Provadia | 6,123.32 mi (9,854.53 km) |
| Keller to Radnevo | 6,114.06 mi (9,839.63 km) |
| Keller to Radomir | 5,993.21 mi (9,645.14 km) |
| Keller to Rakitovo | 6,062.14 mi (9,756.07 km) |
| Keller to Rakovski | 6,079.67 mi (9,784.28 km) |
| Keller to Razgrad | 6,073.94 mi (9,775.06 km) |
| Keller to Razlog | 6,044.11 mi (9,727.06 km) |
| Keller to Ruse | 6,039.95 mi (9,720.36 km) |
| Keller to Samokov | 6,025.71 mi (9,697.44 km) |
| Keller to Sandanski | 6,052.28 mi (9,740.20 km) |
| Keller to Sevlievo | 6,049.14 mi (9,735.16 km) |
| Keller to Shumen | 6,100.90 mi (9,818.45 km) |
| Keller to Silistra | 6,070.73 mi (9,769.90 km) |
| Keller to Sliven | 6,109.47 mi (9,832.24 km) |
