| Princeton to Popovo | 5,789.32 mi (9,317.01 km) |
| Princeton to Provadia | 5,847.37 mi (9,410.44 km) |
| Princeton to Radnevo | 5,811.86 mi (9,353.28 km) |
| Princeton to Radomir | 5,669.94 mi (9,124.88 km) |
| Princeton to Rakitovo | 5,739.48 mi (9,236.79 km) |
| Princeton to Rakovski | 5,769.06 mi (9,284.41 km) |
| Princeton to Razgrad | 5,795.41 mi (9,326.81 km) |
| Princeton to Razlog | 5,714.80 mi (9,197.08 km) |
| Princeton to Ruse | 5,761.07 mi (9,271.54 km) |
| Princeton to Samokov | 5,704.10 mi (9,179.86 km) |
| Princeton to Sandanski | 5,716.60 mi (9,199.98 km) |
| Princeton to Sevlievo | 5,751.03 mi (9,255.40 km) |
| Princeton to Shumen | 5,822.15 mi (9,369.84 km) |
| Princeton to Silistra | 5,807.38 mi (9,346.08 km) |
| Princeton to Sliven | 5,816.50 mi (9,360.75 km) |
