| Kalkar to Orzesze | 552.60 mi (889.32 km) |
| Kalkar to Osowa | 537.62 mi (865.22 km) |
| Kalkar to Ostroda | 587.10 mi (944.84 km) |
| Kalkar to Ostroleka | 649.10 mi (1,044.63 km) |
| Kalkar to Ostrow Mazowiecka | 662.64 mi (1,066.42 km) |
| Kalkar to Ostrow Wielkopolski | 493.07 mi (793.52 km) |
| Kalkar to Ostrowiec Swietokrzyski | 653.32 mi (1,051.42 km) |
| Kalkar to Ostrzeszow | 499.80 mi (804.35 km) |
| Kalkar to Oswiecim | 574.83 mi (925.09 km) |
| Kalkar to Otwock | 637.40 mi (1,025.80 km) |
| Kalkar to Ozarow Mazowiecki | 617.27 mi (993.41 km) |
| Kalkar to Ozimek | 520.65 mi (837.91 km) |
| Kalkar to Ozorkow | 553.90 mi (891.42 km) |
| Kalkar to Pabianice | 559.93 mi (901.12 km) |
| Kalkar to Parczew | 708.48 mi (1,140.18 km) |
