| University of California-Santa Barbara to Popovo | 6,654.30 mi (10,709.06 km) |
| University of California-Santa Barbara to Provadia | 6,692.08 mi (10,769.86 km) |
| University of California-Santa Barbara to Radnevo | 6,711.44 mi (10,801.02 km) |
| University of California-Santa Barbara to Radomir | 6,622.62 mi (10,658.08 km) |
| University of California-Santa Barbara to Rakitovo | 6,685.33 mi (10,759.00 km) |
| University of California-Santa Barbara to Rakovski | 6,688.75 mi (10,764.50 km) |
| University of California-Santa Barbara to Razgrad | 6,649.62 mi (10,701.53 km) |
| University of California-Santa Barbara to Razlog | 6,675.73 mi (10,743.55 km) |
| University of California-Santa Barbara to Ruse | 6,618.85 mi (10,652.02 km) |
| University of California-Santa Barbara to Samokov | 6,650.75 mi (10,703.34 km) |
| University of California-Santa Barbara to Sandanski | 6,689.90 mi (10,766.35 km) |
| University of California-Santa Barbara to Sevlievo | 6,647.58 mi (10,698.25 km) |
| University of California-Santa Barbara to Shumen | 6,674.54 mi (10,741.64 km) |
| University of California-Santa Barbara to Silistra | 6,630.56 mi (10,670.86 km) |
| University of California-Santa Barbara to Sliven | 6,697.47 mi (10,778.54 km) |
