| Eureka to Popovo | 6,337.69 mi (10,199.53 km) |
| Eureka to Provadia | 6,370.58 mi (10,252.46 km) |
| Eureka to Radnevo | 6,399.20 mi (10,298.51 km) |
| Eureka to Radomir | 6,323.28 mi (10,176.33 km) |
| Eureka to Rakitovo | 6,382.55 mi (10,271.72 km) |
| Eureka to Rakovski | 6,380.97 mi (10,269.18 km) |
| Eureka to Razgrad | 6,331.24 mi (10,189.14 km) |
| Eureka to Razlog | 6,376.12 mi (10,261.38 km) |
| Eureka to Ruse | 6,302.14 mi (10,142.32 km) |
| Eureka to Samokov | 6,349.30 mi (10,218.21 km) |
| Eureka to Sandanski | 6,392.15 mi (10,287.17 km) |
| Eureka to Sevlievo | 6,336.94 mi (10,198.32 km) |
| Eureka to Shumen | 6,355.00 mi (10,227.38 km) |
| Eureka to Silistra | 6,307.30 mi (10,150.61 km) |
| Eureka to Sliven | 6,382.31 mi (10,271.33 km) |
