| Wallingford Center to Popovo | 4,723.73 mi (7,602.10 km) |
| Wallingford Center to Provadia | 4,778.61 mi (7,690.43 km) |
| Wallingford Center to Radnevo | 4,755.61 mi (7,653.42 km) |
| Wallingford Center to Radomir | 4,623.19 mi (7,440.30 km) |
| Wallingford Center to Rakitovo | 4,693.07 mi (7,552.77 km) |
| Wallingford Center to Rakovski | 4,716.68 mi (7,590.76 km) |
| Wallingford Center to Razgrad | 4,727.37 mi (7,607.97 km) |
| Wallingford Center to Razlog | 4,671.68 mi (7,518.35 km) |
| Wallingford Center to Ruse | 4,692.86 mi (7,552.43 km) |
| Wallingford Center to Samokov | 4,656.80 mi (7,494.40 km) |
| Wallingford Center to Sandanski | 4,676.92 mi (7,526.78 km) |
| Wallingford Center to Sevlievo | 4,692.15 mi (7,551.28 km) |
| Wallingford Center to Shumen | 4,754.48 mi (7,651.59 km) |
| Wallingford Center to Silistra | 4,732.32 mi (7,615.93 km) |
| Wallingford Center to Sliven | 4,755.69 mi (7,653.55 km) |
