| Festus to Odessa (Texas) | 803.68 mi (1,293.39 km) |
| Festus to Ogden (Utah) | 1,161.23 mi (1,868.83 km) |
| Festus to Oildale (California) | 1,588.27 mi (2,556.08 km) |
| Festus to Ojus (Florida) | 1,036.63 mi (1,668.29 km) |
| Festus to Okemos (Michigan) | 441.86 mi (711.11 km) |
| Festus to Oklahoma City (Oklahoma) | 436.22 mi (702.04 km) |
| Festus to Okmulgee (Oklahoma) | 357.70 mi (575.66 km) |
| Festus to Olathe (Kansas) | 242.66 mi (390.52 km) |
| Festus to Old Jamestown (Missouri) | 43.37 mi (69.79 km) |
| Festus to Oldsmar (Florida) | 832.40 mi (1,339.61 km) |
| Festus to Olean (New York) | 685.76 mi (1,103.62 km) |
| Festus to Olive Branch (Mississippi) | 227.29 mi (365.78 km) |
| Festus to Olivehurst (California) | 1,673.51 mi (2,693.25 km) |
| Festus to Olney (Maryland) | 721.59 mi (1,161.29 km) |
| Festus to Olympia (Washington) | 1,745.20 mi (2,808.63 km) |
