| Sliven to Nottingham | 1,446.35 mi (2,327.67 km) |
| Sliven to Nuneaton | 1,450.07 mi (2,333.66 km) |
| Sliven to Oadby | 1,435.89 mi (2,310.84 km) |
| Sliven to Oakengates | 1,492.99 mi (2,402.73 km) |
| Sliven to Oakham | 1,423.71 mi (2,291.24 km) |
| Sliven to Oldbury | 1,471.81 mi (2,368.65 km) |
| Sliven to Oldham | 1,497.16 mi (2,409.44 km) |
| Sliven to Ollerton | 1,446.69 mi (2,328.22 km) |
| Sliven to Olton | 1,462.03 mi (2,352.90 km) |
| Sliven to Omagh | 1,718.74 mi (2,766.04 km) |
| Sliven to Ormesby | 1,485.64 mi (2,390.91 km) |
| Sliven to Ormskirk | 1,527.68 mi (2,458.57 km) |
| Sliven to Orpington | 1,363.74 mi (2,194.72 km) |
| Sliven to Ossett | 1,479.40 mi (2,380.86 km) |
| Sliven to Oswaldtwistle | 1,512.24 mi (2,433.72 km) |
