| Ukiah to Popovo | 6,425.43 mi (10,340.73 km) |
| Ukiah to Provadia | 6,459.46 mi (10,395.50 km) |
| Ukiah to Radnevo | 6,485.99 mi (10,438.20 km) |
| Ukiah to Radomir | 6,407.05 mi (10,311.15 km) |
| Ukiah to Rakitovo | 6,467.16 mi (10,407.89 km) |
| Ukiah to Rakovski | 6,466.73 mi (10,407.20 km) |
| Ukiah to Razgrad | 6,419.37 mi (10,330.98 km) |
| Ukiah to Razlog | 6,460.00 mi (10,396.37 km) |
| Ukiah to Ruse | 6,389.88 mi (10,283.51 km) |
| Ukiah to Samokov | 6,433.58 mi (10,353.84 km) |
| Ukiah to Sandanski | 6,475.62 mi (10,421.50 km) |
| Ukiah to Sevlievo | 6,423.32 mi (10,337.33 km) |
| Ukiah to Shumen | 6,443.42 mi (10,369.69 km) |
| Ukiah to Silistra | 6,396.53 mi (10,294.22 km) |
| Ukiah to Sliven | 6,469.75 mi (10,412.06 km) |
