| Highlands Ranch to Smolyan | 6,003.27 mi (9,661.32 km) |
| Highlands Ranch to Sofia | 5,899.42 mi (9,494.20 km) |
| Highlands Ranch to Sopot | 5,945.53 mi (9,568.40 km) |
| Highlands Ranch to Sozopol | 6,045.93 mi (9,729.98 km) |
| Highlands Ranch to Sredets | 6,035.17 mi (9,712.67 km) |
| Highlands Ranch to Stamboliyski | 5,967.63 mi (9,603.96 km) |
| Highlands Ranch to Stara Zagora | 5,984.66 mi (9,631.38 km) |
| Highlands Ranch to Svilengrad | 6,038.52 mi (9,718.05 km) |
| Highlands Ranch to Svishtov | 5,909.62 mi (9,510.61 km) |
| Highlands Ranch to Targovishte | 5,966.32 mi (9,601.87 km) |
| Highlands Ranch to Teteven | 5,916.11 mi (9,521.06 km) |
| Highlands Ranch to Troyan | 5,931.56 mi (9,545.93 km) |
| Highlands Ranch to Tryavna | 5,955.94 mi (9,585.15 km) |
| Highlands Ranch to Tutrakan | 5,922.19 mi (9,530.85 km) |
| Highlands Ranch to Varna | 6,006.61 mi (9,666.70 km) |
