| Willowbrook to Popovo | 6,646.72 mi (10,696.87 km) |
| Willowbrook to Provadia | 6,685.71 mi (10,759.61 km) |
| Willowbrook to Radnevo | 6,702.67 mi (10,786.90 km) |
| Willowbrook to Radomir | 6,610.76 mi (10,638.99 km) |
| Willowbrook to Rakitovo | 6,674.22 mi (10,741.12 km) |
| Willowbrook to Rakovski | 6,678.88 mi (10,748.62 km) |
| Willowbrook to Razgrad | 6,642.51 mi (10,690.08 km) |
| Willowbrook to Razlog | 6,663.85 mi (10,724.44 km) |
| Willowbrook to Ruse | 6,611.36 mi (10,639.96 km) |
| Willowbrook to Samokov | 6,639.36 mi (10,685.02 km) |
| Willowbrook to Sandanski | 6,677.54 mi (10,746.46 km) |
| Willowbrook to Sevlievo | 6,638.50 mi (10,683.63 km) |
| Willowbrook to Shumen | 6,667.69 mi (10,730.61 km) |
| Willowbrook to Silistra | 6,624.74 mi (10,661.49 km) |
| Willowbrook to Sliven | 6,689.46 mi (10,765.65 km) |
