| Kalamazoo to Popovo | 5,169.92 mi (8,320.18 km) |
| Kalamazoo to Provadia | 5,220.77 mi (8,402.02 km) |
| Kalamazoo to Radnevo | 5,210.08 mi (8,384.81 km) |
| Kalamazoo to Radomir | 5,088.37 mi (8,188.94 km) |
| Kalamazoo to Rakitovo | 5,157.38 mi (8,300.00 km) |
| Kalamazoo to Rakovski | 5,175.30 mi (8,328.84 km) |
| Kalamazoo to Razgrad | 5,171.12 mi (8,322.11 km) |
| Kalamazoo to Razlog | 5,139.19 mi (8,270.72 km) |
| Kalamazoo to Ruse | 5,137.03 mi (8,267.25 km) |
| Kalamazoo to Samokov | 5,120.94 mi (8,241.36 km) |
| Kalamazoo to Sandanski | 5,147.25 mi (8,283.69 km) |
| Kalamazoo to Sevlievo | 5,145.24 mi (8,280.46 km) |
| Kalamazoo to Shumen | 5,198.13 mi (8,365.57 km) |
| Kalamazoo to Silistra | 5,168.91 mi (8,318.56 km) |
| Kalamazoo to Sliven | 5,205.92 mi (8,378.11 km) |
