| Riverton to Popovo | 6,084.19 mi (9,791.56 km) |
| Riverton to Provadia | 6,124.40 mi (9,856.27 km) |
| Riverton to Radnevo | 6,138.93 mi (9,879.66 km) |
| Riverton to Radomir | 6,044.43 mi (9,727.58 km) |
| Riverton to Rakitovo | 6,108.46 mi (9,830.62 km) |
| Riverton to Rakovski | 6,114.17 mi (9,839.80 km) |
| Riverton to Razgrad | 6,080.45 mi (9,785.54 km) |
| Riverton to Razlog | 6,097.49 mi (9,812.97 km) |
| Riverton to Ruse | 6,048.93 mi (9,734.82 km) |
| Riverton to Samokov | 6,073.40 mi (9,774.19 km) |
| Riverton to Sandanski | 6,110.82 mi (9,834.41 km) |
| Riverton to Sevlievo | 6,074.52 mi (9,775.99 km) |
| Riverton to Shumen | 6,105.89 mi (9,826.48 km) |
| Riverton to Silistra | 6,064.09 mi (9,759.21 km) |
| Riverton to Sliven | 6,126.47 mi (9,859.60 km) |
