| Ottumwa to Popovo | 5,471.86 mi (8,806.11 km) |
| Ottumwa to Provadia | 5,520.83 mi (8,884.92 km) |
| Ottumwa to Radnevo | 5,515.18 mi (8,875.83 km) |
| Ottumwa to Radomir | 5,398.28 mi (8,687.69 km) |
| Ottumwa to Rakitovo | 5,466.65 mi (8,797.72 km) |
| Ottumwa to Rakovski | 5,482.23 mi (8,822.79 km) |
| Ottumwa to Razgrad | 5,472.06 mi (8,806.44 km) |
| Ottumwa to Razlog | 5,449.79 mi (8,770.59 km) |
| Ottumwa to Ruse | 5,438.31 mi (8,752.12 km) |
| Ottumwa to Samokov | 5,430.30 mi (8,739.22 km) |
| Ottumwa to Sandanski | 5,458.93 mi (8,785.29 km) |
| Ottumwa to Sevlievo | 5,450.08 mi (8,771.06 km) |
| Ottumwa to Shumen | 5,498.90 mi (8,849.62 km) |
| Ottumwa to Silistra | 5,466.95 mi (8,798.21 km) |
| Ottumwa to Sliven | 5,509.33 mi (8,866.40 km) |
