| Duluth to Opole | 4,525.89 mi (7,283.72 km) |
| Duluth to Orzesze | 4,576.56 mi (7,365.26 km) |
| Duluth to Osowa | 4,359.73 mi (7,016.31 km) |
| Duluth to Ostroda | 4,438.20 mi (7,142.59 km) |
| Duluth to Ostroleka | 4,515.53 mi (7,267.05 km) |
| Duluth to Ostrow Mazowiecka | 4,538.46 mi (7,303.94 km) |
| Duluth to Ostrow Wielkopolski | 4,474.43 mi (7,200.91 km) |
| Duluth to Ostrowiec Swietokrzyski | 4,617.87 mi (7,431.74 km) |
| Duluth to Ostrzeszow | 4,489.31 mi (7,224.85 km) |
| Duluth to Oswiecim | 4,596.67 mi (7,397.63 km) |
| Duluth to Otwock | 4,554.42 mi (7,329.63 km) |
| Duluth to Ozarow Mazowiecki | 4,535.77 mi (7,299.61 km) |
| Duluth to Ozimek | 4,534.23 mi (7,297.13 km) |
| Duluth to Ozorkow | 4,503.24 mi (7,247.27 km) |
| Duluth to Pabianice | 4,521.83 mi (7,277.19 km) |
