| Red Bluff to Popovo | 6,340.30 mi (10,203.73 km) |
| Red Bluff to Provadia | 6,374.62 mi (10,258.96 km) |
| Red Bluff to Radnevo | 6,400.64 mi (10,300.84 km) |
| Red Bluff to Radomir | 6,321.08 mi (10,172.79 km) |
| Red Bluff to Rakitovo | 6,381.35 mi (10,269.79 km) |
| Red Bluff to Rakovski | 6,381.15 mi (10,269.48 km) |
| Red Bluff to Razgrad | 6,334.35 mi (10,194.15 km) |
| Red Bluff to Razlog | 6,374.05 mi (10,258.04 km) |
| Red Bluff to Ruse | 6,304.75 mi (10,146.52 km) |
| Red Bluff to Samokov | 6,347.70 mi (10,215.64 km) |
| Red Bluff to Sandanski | 6,389.58 mi (10,283.04 km) |
| Red Bluff to Sevlievo | 6,337.88 mi (10,199.83 km) |
| Red Bluff to Shumen | 6,358.46 mi (10,232.96 km) |
| Red Bluff to Silistra | 6,311.78 mi (10,157.83 km) |
| Red Bluff to Sliven | 6,384.56 mi (10,274.95 km) |
