| Sliven to Orangevale (California) | 6,457.88 mi (10,392.96 km) |
| Sliven to Orchards (Washington) | 6,037.93 mi (9,717.11 km) |
| Sliven to Orcutt (California) | 6,681.99 mi (10,753.62 km) |
| Sliven to Oregon (Ohio) | 5,157.37 mi (8,299.98 km) |
| Sliven to Oregon (Wisconsin) | 5,307.43 mi (8,541.48 km) |
| Sliven to Oregon City (Oregon) | 6,061.26 mi (9,754.65 km) |
| Sliven to Orem (Utah) | 6,132.87 mi (9,869.90 km) |
| Sliven to Orinda (California) | 6,529.51 mi (10,508.24 km) |
| Sliven to Orland Park (Illinois) | 5,320.39 mi (8,562.35 km) |
| Sliven to Orlando (Florida) | 5,713.82 mi (9,195.50 km) |
| Sliven to Ormond Beach (Florida) | 5,663.62 mi (9,114.72 km) |
| Sliven to Oro Valley (Arizona) | 6,585.67 mi (10,598.62 km) |
| Sliven to Oroville (California) | 6,413.53 mi (10,321.58 km) |
| Sliven to Oshkosh (Wisconsin) | 5,223.75 mi (8,406.81 km) |
| Sliven to Oskaloosa (Iowa) | 5,502.63 mi (8,855.63 km) |
