| Healdsburg to Popovo | 6,452.12 mi (10,383.68 km) |
| Healdsburg to Provadia | 6,486.55 mi (10,439.09 km) |
| Healdsburg to Radnevo | 6,512.35 mi (10,480.61 km) |
| Healdsburg to Radomir | 6,432.36 mi (10,351.89 km) |
| Healdsburg to Rakitovo | 6,492.76 mi (10,449.09 km) |
| Healdsburg to Rakovski | 6,492.73 mi (10,449.04 km) |
| Healdsburg to Razgrad | 6,446.20 mi (10,374.16 km) |
| Healdsburg to Razlog | 6,485.35 mi (10,437.16 km) |
| Healdsburg to Ruse | 6,416.57 mi (10,326.47 km) |
| Healdsburg to Samokov | 6,459.06 mi (10,394.86 km) |
| Healdsburg to Sandanski | 6,500.82 mi (10,462.06 km) |
| Healdsburg to Sevlievo | 6,449.53 mi (10,379.52 km) |
| Healdsburg to Shumen | 6,470.35 mi (10,413.02 km) |
| Healdsburg to Silistra | 6,423.74 mi (10,338.01 km) |
| Healdsburg to Sliven | 6,496.34 mi (10,454.84 km) |
