| Euclid to Smolyan | 5,077.11 mi (8,170.82 km) |
| Euclid to Sofia | 4,973.52 mi (8,004.11 km) |
| Euclid to Sopot | 5,030.31 mi (8,095.50 km) |
| Euclid to Sozopol | 5,152.58 mi (8,292.28 km) |
| Euclid to Sredets | 5,136.98 mi (8,267.17 km) |
| Euclid to Stamboliyski | 5,045.55 mi (8,120.03 km) |
| Euclid to Stara Zagora | 5,074.53 mi (8,166.67 km) |
| Euclid to Svilengrad | 5,126.31 mi (8,250.00 km) |
| Euclid to Svishtov | 5,008.93 mi (8,061.09 km) |
| Euclid to Targovishte | 5,071.97 mi (8,162.55 km) |
| Euclid to Teteven | 4,999.73 mi (8,046.29 km) |
| Euclid to Troyan | 5,018.42 mi (8,076.36 km) |
| Euclid to Tryavna | 5,048.91 mi (8,125.44 km) |
| Euclid to Tutrakan | 5,036.20 mi (8,104.98 km) |
| Euclid to Varna | 5,123.03 mi (8,244.71 km) |
