| Wheat Ridge to Popovo | 5,940.99 mi (9,561.10 km) |
| Wheat Ridge to Provadia | 5,985.02 mi (9,631.95 km) |
| Wheat Ridge to Radnevo | 5,991.30 mi (9,642.06 km) |
| Wheat Ridge to Radomir | 5,887.01 mi (9,474.22 km) |
| Wheat Ridge to Rakitovo | 5,953.16 mi (9,580.69 km) |
| Wheat Ridge to Rakovski | 5,963.01 mi (9,596.53 km) |
| Wheat Ridge to Razgrad | 5,938.85 mi (9,557.66 km) |
| Wheat Ridge to Razlog | 5,939.68 mi (9,558.99 km) |
| Wheat Ridge to Ruse | 5,906.25 mi (9,505.19 km) |
| Wheat Ridge to Samokov | 5,917.39 mi (9,523.11 km) |
| Wheat Ridge to Sandanski | 5,951.32 mi (9,577.72 km) |
| Wheat Ridge to Sevlievo | 5,926.27 mi (9,537.40 km) |
| Wheat Ridge to Shumen | 5,965.00 mi (9,599.74 km) |
| Wheat Ridge to Silistra | 5,927.02 mi (9,538.62 km) |
| Wheat Ridge to Sliven | 5,981.50 mi (9,626.30 km) |
