| Sonoma to Popovo | 6,465.13 mi (10,404.63 km) |
| Sonoma to Provadia | 6,499.93 mi (10,460.63 km) |
| Sonoma to Radnevo | 6,525.04 mi (10,501.04 km) |
| Sonoma to Radomir | 6,444.09 mi (10,370.76 km) |
| Sonoma to Rakitovo | 6,504.75 mi (10,468.38 km) |
| Sonoma to Rakovski | 6,505.09 mi (10,468.92 km) |
| Sonoma to Razgrad | 6,459.35 mi (10,395.32 km) |
| Sonoma to Razlog | 6,497.10 mi (10,456.07 km) |
| Sonoma to Ruse | 6,429.59 mi (10,347.42 km) |
| Sonoma to Samokov | 6,470.95 mi (10,413.99 km) |
| Sonoma to Sandanski | 6,512.44 mi (10,480.75 km) |
| Sonoma to Sevlievo | 6,462.10 mi (10,399.74 km) |
| Sonoma to Shumen | 6,483.58 mi (10,434.32 km) |
| Sonoma to Silistra | 6,437.25 mi (10,359.76 km) |
| Sonoma to Sliven | 6,509.25 mi (10,475.62 km) |
