| Gladstone to Popovo | 5,640.13 mi (9,076.91 km) |
| Gladstone to Provadia | 5,689.02 mi (9,155.60 km) |
| Gladstone to Radnevo | 5,683.53 mi (9,146.76 km) |
| Gladstone to Radomir | 5,566.69 mi (8,958.72 km) |
| Gladstone to Rakitovo | 5,635.05 mi (9,068.74 km) |
| Gladstone to Rakovski | 5,650.61 mi (9,093.78 km) |
| Gladstone to Razgrad | 5,640.29 mi (9,077.18 km) |
| Gladstone to Razlog | 5,618.20 mi (9,041.62 km) |
| Gladstone to Ruse | 5,606.56 mi (9,022.88 km) |
| Gladstone to Samokov | 5,598.70 mi (9,010.24 km) |
| Gladstone to Sandanski | 5,627.33 mi (9,056.31 km) |
| Gladstone to Sevlievo | 5,618.43 mi (9,041.99 km) |
| Gladstone to Shumen | 5,667.12 mi (9,120.35 km) |
| Gladstone to Silistra | 5,635.05 mi (9,068.74 km) |
| Gladstone to Sliven | 5,677.64 mi (9,137.27 km) |
