| Eureka to Smolyan | 6,420.50 mi (10,332.79 km) |
| Eureka to Sofia | 6,321.72 mi (10,173.83 km) |
| Eureka to Sopot | 6,353.68 mi (10,225.27 km) |
| Eureka to Sozopol | 6,424.87 mi (10,339.83 km) |
| Eureka to Sredets | 6,419.97 mi (10,331.95 km) |
| Eureka to Stamboliyski | 6,382.18 mi (10,271.13 km) |
| Eureka to Stara Zagora | 6,385.19 mi (10,275.97 km) |
| Eureka to Svilengrad | 6,438.49 mi (10,361.74 km) |
| Eureka to Svishtov | 6,303.85 mi (10,145.06 km) |
| Eureka to Targovishte | 6,350.66 mi (10,220.39 km) |
| Eureka to Teteven | 6,327.09 mi (10,182.47 km) |
| Eureka to Troyan | 6,338.19 mi (10,200.33 km) |
| Eureka to Tryavna | 6,354.59 mi (10,226.72 km) |
| Eureka to Tutrakan | 6,299.92 mi (10,138.74 km) |
| Eureka to Varna | 6,377.14 mi (10,263.01 km) |
