| Richardson to Popovo | 6,052.73 mi (9,740.93 km) |
| Richardson to Provadia | 6,103.20 mi (9,822.15 km) |
| Richardson to Radnevo | 6,093.40 mi (9,806.38 km) |
| Richardson to Radomir | 5,972.04 mi (9,611.06 km) |
| Richardson to Rakitovo | 6,041.03 mi (9,722.10 km) |
| Richardson to Rakovski | 6,058.81 mi (9,750.71 km) |
| Richardson to Razgrad | 6,053.73 mi (9,742.54 km) |
| Richardson to Razlog | 6,022.86 mi (9,692.86 km) |
| Richardson to Ruse | 6,019.71 mi (9,687.78 km) |
| Richardson to Samokov | 6,004.59 mi (9,663.46 km) |
| Richardson to Sandanski | 6,030.91 mi (9,705.81 km) |
| Richardson to Sevlievo | 6,028.52 mi (9,701.96 km) |
| Richardson to Shumen | 6,080.71 mi (9,785.95 km) |
| Richardson to Silistra | 6,050.83 mi (9,737.87 km) |
| Richardson to Sliven | 6,088.99 mi (9,799.29 km) |
