| Dayton to Opole | 4,621.55 mi (7,437.67 km) |
| Dayton to Orzesze | 4,671.57 mi (7,518.17 km) |
| Dayton to Osowa | 4,492.14 mi (7,229.40 km) |
| Dayton to Ostroda | 4,570.62 mi (7,355.71 km) |
| Dayton to Ostroleka | 4,649.68 mi (7,482.94 km) |
| Dayton to Ostrow Mazowiecka | 4,671.84 mi (7,518.60 km) |
| Dayton to Ostrow Wielkopolski | 4,578.45 mi (7,368.30 km) |
| Dayton to Ostrowiec Swietokrzyski | 4,732.73 mi (7,616.60 km) |
| Dayton to Ostrzeszow | 4,591.76 mi (7,389.73 km) |
| Dayton to Oswiecim | 4,693.01 mi (7,552.68 km) |
| Dayton to Otwock | 4,678.88 mi (7,529.94 km) |
| Dayton to Ozarow Mazowiecki | 4,658.89 mi (7,497.76 km) |
| Dayton to Ozimek | 4,631.30 mi (7,453.35 km) |
| Dayton to Ozorkow | 4,617.01 mi (7,430.36 km) |
| Dayton to Pabianice | 4,633.25 mi (7,456.49 km) |
