| Highlands Ranch to Popovo | 5,950.49 mi (9,576.38 km) |
| Highlands Ranch to Provadia | 5,994.67 mi (9,647.50 km) |
| Highlands Ranch to Radnevo | 6,000.59 mi (9,657.02 km) |
| Highlands Ranch to Radomir | 5,895.88 mi (9,488.51 km) |
| Highlands Ranch to Rakitovo | 5,962.12 mi (9,595.11 km) |
| Highlands Ranch to Rakovski | 5,972.15 mi (9,611.25 km) |
| Highlands Ranch to Razgrad | 5,948.42 mi (9,573.06 km) |
| Highlands Ranch to Razlog | 5,948.53 mi (9,573.24 km) |
| Highlands Ranch to Ruse | 5,915.78 mi (9,520.52 km) |
| Highlands Ranch to Samokov | 5,926.32 mi (9,537.49 km) |
| Highlands Ranch to Sandanski | 5,960.09 mi (9,591.84 km) |
| Highlands Ranch to Sevlievo | 5,935.55 mi (9,552.34 km) |
| Highlands Ranch to Shumen | 5,974.60 mi (9,615.18 km) |
| Highlands Ranch to Silistra | 5,936.79 mi (9,554.33 km) |
| Highlands Ranch to Sliven | 5,990.92 mi (9,641.45 km) |
