| Karlovy Vary to Oegstgeest | 387.80 mi (624.10 km) |
| Karlovy Vary to Oirschot | 341.49 mi (549.58 km) |
| Karlovy Vary to Oisterwijk | 346.92 mi (558.31 km) |
| Karlovy Vary to Oldebroek | 337.57 mi (543.26 km) |
| Karlovy Vary to Oldenzaal | 294.28 mi (473.61 km) |
| Karlovy Vary to Ommen | 319.96 mi (514.92 km) |
| Karlovy Vary to Oosterend | 349.01 mi (561.68 km) |
| Karlovy Vary to Oosterhout | 362.18 mi (582.88 km) |
| Karlovy Vary to Oosterwolde | 340.52 mi (548.01 km) |
| Karlovy Vary to Oostzaan | 376.71 mi (606.26 km) |
| Karlovy Vary to Opmeer | 381.04 mi (613.22 km) |
| Karlovy Vary to Oss | 336.83 mi (542.07 km) |
| Karlovy Vary to Oud-Beijerland | 383.92 mi (617.85 km) |
| Karlovy Vary to Oudenbosch | 375.40 mi (604.15 km) |
| Karlovy Vary to Oudewater | 368.22 mi (592.60 km) |
