| Northbrook to Popovo | 5,256.75 mi (8,459.92 km) |
| Northbrook to Provadia | 5,306.90 mi (8,540.63 km) |
| Northbrook to Radnevo | 5,298.13 mi (8,526.51 km) |
| Northbrook to Radomir | 5,178.23 mi (8,333.55 km) |
| Northbrook to Rakitovo | 5,247.01 mi (8,444.24 km) |
| Northbrook to Rakovski | 5,264.03 mi (8,471.65 km) |
| Northbrook to Razgrad | 5,257.57 mi (8,461.24 km) |
| Northbrook to Razlog | 5,229.33 mi (8,415.79 km) |
| Northbrook to Ruse | 5,223.60 mi (8,406.57 km) |
| Northbrook to Samokov | 5,210.59 mi (8,385.64 km) |
| Northbrook to Sandanski | 5,237.80 mi (8,429.43 km) |
| Northbrook to Sevlievo | 5,233.17 mi (8,421.97 km) |
| Northbrook to Shumen | 5,284.52 mi (8,504.61 km) |
| Northbrook to Silistra | 5,254.26 mi (8,455.92 km) |
| Northbrook to Sliven | 5,293.32 mi (8,518.77 km) |
