| Duncan to Opole | 5,377.30 mi (8,653.93 km) |
| Duncan to Orzesze | 5,427.87 mi (8,735.31 km) |
| Duncan to Osowa | 5,225.57 mi (8,409.74 km) |
| Duncan to Ostroda | 5,304.31 mi (8,536.46 km) |
| Duncan to Ostroleka | 5,382.54 mi (8,662.37 km) |
| Duncan to Ostrow Mazowiecka | 5,405.26 mi (8,698.93 km) |
| Duncan to Ostrow Wielkopolski | 5,329.30 mi (8,576.69 km) |
| Duncan to Ostrowiec Swietokrzyski | 5,477.77 mi (8,815.61 km) |
| Duncan to Ostrzeszow | 5,343.57 mi (8,599.64 km) |
| Duncan to Oswiecim | 5,448.64 mi (8,768.74 km) |
| Duncan to Otwock | 5,417.91 mi (8,719.28 km) |
| Duncan to Ozarow Mazowiecki | 5,398.67 mi (8,688.32 km) |
| Duncan to Ozimek | 5,386.29 mi (8,668.40 km) |
| Duncan to Ozorkow | 5,362.30 mi (8,629.78 km) |
| Duncan to Pabianice | 5,379.99 mi (8,658.25 km) |
