| Cities | Distance |
|---|---|
| Heerlen to Nowy Sacz | 654.71 mi (1,053.65 km) |
| Heerlen to Nowy Targ | 627.66 mi (1,010.12 km) |
| Heerlen to Nowy Tomysl | 446.32 mi (718.28 km) |
| Heerlen to Nysa | 497.29 mi (800.31 km) |
| Heerlen to Oborniki | 478.53 mi (770.12 km) |
| Heerlen to Oborniki Slaskie | 474.25 mi (763.23 km) |
| Heerlen to Olawa | 492.57 mi (792.72 km) |
| Heerlen to Olecko | 726.68 mi (1,169.48 km) |
| Heerlen to Olesnica | 495.23 mi (797.00 km) |
| Heerlen to Olesno | 541.39 mi (871.29 km) |
| Heerlen to Olkusz | 596.46 mi (959.91 km) |
| Heerlen to Olsztyn | 642.56 mi (1,034.10 km) |
| Heerlen to Opalenica | 457.94 mi (736.98 km) |
| Heerlen to Opoczno | 620.15 mi (998.03 km) |
| Heerlen to Opole | 521.77 mi (839.70 km) |