| Greenock to Popovo | 1,616.65 mi (2,601.75 km) |
| Greenock to Provadia | 1,668.49 mi (2,685.17 km) |
| Greenock to Radnevo | 1,656.52 mi (2,665.91 km) |
| Greenock to Radomir | 1,538.25 mi (2,475.57 km) |
| Greenock to Rakitovo | 1,606.48 mi (2,585.38 km) |
| Greenock to Rakovski | 1,622.46 mi (2,611.09 km) |
| Greenock to Razgrad | 1,618.34 mi (2,604.47 km) |
| Greenock to Razlog | 1,589.96 mi (2,558.79 km) |
| Greenock to Ruse | 1,584.11 mi (2,549.38 km) |
| Greenock to Samokov | 1,570.15 mi (2,526.91 km) |
| Greenock to Sandanski | 1,599.65 mi (2,574.39 km) |
| Greenock to Sevlievo | 1,591.62 mi (2,561.46 km) |
| Greenock to Shumen | 1,645.41 mi (2,648.03 km) |
| Greenock to Silistra | 1,618.58 mi (2,604.85 km) |
| Greenock to Sliven | 1,652.27 mi (2,659.07 km) |
