| Cedar Falls to Popovo | 5,394.35 mi (8,681.36 km) |
| Cedar Falls to Provadia | 5,442.65 mi (8,759.10 km) |
| Cedar Falls to Radnevo | 5,438.73 mi (8,752.80 km) |
| Cedar Falls to Radomir | 5,323.66 mi (8,567.61 km) |
| Cedar Falls to Rakitovo | 5,391.74 mi (8,677.17 km) |
| Cedar Falls to Rakovski | 5,406.45 mi (8,700.85 km) |
| Cedar Falls to Razgrad | 5,394.21 mi (8,681.15 km) |
| Cedar Falls to Razlog | 5,375.40 mi (8,650.88 km) |
| Cedar Falls to Ruse | 5,360.59 mi (8,627.04 km) |
| Cedar Falls to Samokov | 5,355.45 mi (8,618.77 km) |
| Cedar Falls to Sandanski | 5,384.95 mi (8,666.24 km) |
| Cedar Falls to Sevlievo | 5,373.59 mi (8,647.95 km) |
| Cedar Falls to Shumen | 5,420.98 mi (8,724.22 km) |
| Cedar Falls to Silistra | 5,388.14 mi (8,671.38 km) |
| Cedar Falls to Sliven | 5,432.29 mi (8,742.43 km) |
