| Sliven to Odessa (Texas) | 6,345.31 mi (10,211.79 km) |
| Sliven to Ogden (Utah) | 6,083.78 mi (9,790.90 km) |
| Sliven to Oildale (California) | 6,614.28 mi (10,644.65 km) |
| Sliven to Ojus (Florida) | 5,785.75 mi (9,311.26 km) |
| Sliven to Okemos (Michigan) | 5,142.49 mi (8,276.03 km) |
| Sliven to Oklahoma City (Oklahoma) | 5,981.10 mi (9,625.65 km) |
| Sliven to Okmulgee (Oklahoma) | 5,920.88 mi (9,528.74 km) |
| Sliven to Olathe (Kansas) | 5,704.14 mi (9,179.92 km) |
| Sliven to Old Jamestown (Missouri) | 5,547.64 mi (8,928.07 km) |
| Sliven to Oldsmar (Florida) | 5,791.79 mi (9,320.98 km) |
| Sliven to Olean (New York) | 4,948.52 mi (7,963.88 km) |
| Sliven to Olive Branch (Mississippi) | 5,731.53 mi (9,224.01 km) |
| Sliven to Olivehurst (California) | 6,440.12 mi (10,364.37 km) |
| Sliven to Olney (Maryland) | 5,029.51 mi (8,094.22 km) |
| Sliven to Olympia (Washington) | 5,958.02 mi (9,588.51 km) |
