| Deltona to Olympia Heights (Florida) | 226.25 mi (364.11 km) |
| Deltona to Omaha (Nebraska) | 1,193.68 mi (1,921.04 km) |
| Deltona to On Top of the World Designated Place (Florida) | 66.30 mi (106.70 km) |
| Deltona to Onalaska (Wisconsin) | 1,172.91 mi (1,887.62 km) |
| Deltona to Oneida (New York) | 1,026.56 mi (1,652.08 km) |
| Deltona to Oneonta (New York) | 997.03 mi (1,604.57 km) |
| Deltona to Ontario (California) | 2,162.24 mi (3,479.80 km) |
| Deltona to Ontario (Oregon) | 2,221.08 mi (3,574.49 km) |
| Deltona to Opa-locka (Florida) | 215.81 mi (347.31 km) |
| Deltona to Opelika (Alabama) | 358.29 mi (576.61 km) |
| Deltona to Opelousas (Louisiana) | 661.41 mi (1,064.44 km) |
| Deltona to Orange (California) | 2,174.85 mi (3,500.09 km) |
| Deltona to Orange (Texas) | 758.70 mi (1,221.02 km) |
| Deltona to Orange City (Florida) | 4.95 mi (7.96 km) |
| Deltona to Orangeburg (South Carolina) | 317.65 mi (511.20 km) |
