| Amarillo to Popovo | 6,102.35 mi (9,820.78 km) |
| Amarillo to Provadia | 6,149.75 mi (9,897.06 km) |
| Amarillo to Radnevo | 6,147.99 mi (9,894.24 km) |
| Amarillo to Radomir | 6,034.72 mi (9,711.94 km) |
| Amarillo to Rakitovo | 6,102.54 mi (9,821.09 km) |
| Amarillo to Rakovski | 6,116.43 mi (9,843.45 km) |
| Amarillo to Razgrad | 6,101.77 mi (9,819.86 km) |
| Amarillo to Razlog | 6,086.64 mi (9,795.50 km) |
| Amarillo to Ruse | 6,068.35 mi (9,766.06 km) |
| Amarillo to Samokov | 6,066.31 mi (9,762.78 km) |
| Amarillo to Sandanski | 6,096.49 mi (9,811.36 km) |
| Amarillo to Sevlievo | 6,082.81 mi (9,789.34 km) |
| Amarillo to Shumen | 6,128.42 mi (9,862.75 km) |
| Amarillo to Silistra | 6,094.36 mi (9,807.92 km) |
| Amarillo to Sliven | 6,140.87 mi (9,882.78 km) |
