| Irving to Popovo | 6,068.16 mi (9,765.76 km) |
| Irving to Provadia | 6,118.57 mi (9,846.88 km) |
| Irving to Radnevo | 6,108.94 mi (9,831.39 km) |
| Irving to Radomir | 5,987.74 mi (9,636.34 km) |
| Irving to Rakitovo | 6,056.72 mi (9,747.34 km) |
| Irving to Rakovski | 6,074.42 mi (9,775.83 km) |
| Irving to Razgrad | 6,069.13 mi (9,767.32 km) |
| Irving to Razlog | 6,038.59 mi (9,718.17 km) |
| Irving to Ruse | 6,035.11 mi (9,712.58 km) |
| Irving to Samokov | 6,020.28 mi (9,688.71 km) |
| Irving to Sandanski | 6,046.67 mi (9,731.18 km) |
| Irving to Sevlievo | 6,044.05 mi (9,726.96 km) |
| Irving to Shumen | 6,096.10 mi (9,810.72 km) |
| Irving to Silistra | 6,066.13 mi (9,762.49 km) |
| Irving to Sliven | 6,104.48 mi (9,824.21 km) |
