| Sliven to Oswego (Illinois) | 5,333.43 mi (8,583.33 km) |
| Sliven to Oswego (New York) | 4,812.52 mi (7,745.01 km) |
| Sliven to Otsego (Minnesota) | 5,327.00 mi (8,572.98 km) |
| Sliven to Ottawa (Illinois) | 5,367.25 mi (8,637.76 km) |
| Sliven to Ottawa (Kansas) | 5,734.44 mi (9,228.69 km) |
| Sliven to Ottumwa (Iowa) | 5,509.33 mi (8,866.40 km) |
| Sliven to Overland (Missouri) | 5,558.02 mi (8,944.77 km) |
| Sliven to Overland Park (Kansas) | 5,699.40 mi (9,172.30 km) |
| Sliven to Overlea (Maryland) | 4,997.33 mi (8,042.43 km) |
| Sliven to Oviedo (Florida) | 5,698.56 mi (9,170.95 km) |
| Sliven to Owasso (Oklahoma) | 5,878.33 mi (9,460.26 km) |
| Sliven to Owatonna (Minnesota) | 5,375.93 mi (8,651.73 km) |
| Sliven to Owensboro (Kentucky) | 5,486.48 mi (8,829.64 km) |
| Sliven to Owings Mills (Maryland) | 5,006.16 mi (8,056.64 km) |
| Sliven to Owosso (Michigan) | 5,119.88 mi (8,239.66 km) |
