| Gilbert to Popovo | 6,513.56 mi (10,482.57 km) |
| Gilbert to Provadia | 6,556.63 mi (10,551.88 km) |
| Gilbert to Radnevo | 6,564.97 mi (10,565.30 km) |
| Gilbert to Radomir | 6,462.63 mi (10,400.60 km) |
| Gilbert to Rakitovo | 6,528.43 mi (10,506.49 km) |
| Gilbert to Rakovski | 6,537.44 mi (10,520.99 km) |
| Gilbert to Razgrad | 6,511.02 mi (10,478.47 km) |
| Gilbert to Razlog | 6,515.41 mi (10,485.53 km) |
| Gilbert to Ruse | 6,478.67 mi (10,426.41 km) |
| Gilbert to Samokov | 6,492.77 mi (10,449.10 km) |
| Gilbert to Sandanski | 6,527.34 mi (10,504.74 km) |
| Gilbert to Sevlievo | 6,500.04 mi (10,460.80 km) |
| Gilbert to Shumen | 6,537.00 mi (10,520.29 km) |
| Gilbert to Silistra | 6,497.96 mi (10,457.45 km) |
| Gilbert to Sliven | 6,554.54 mi (10,548.51 km) |
