| Heerlen to Orzesze | 562.46 mi (905.19 km) |
| Heerlen to Osowa | 576.77 mi (928.22 km) |
| Heerlen to Ostroda | 620.95 mi (999.33 km) |
| Heerlen to Ostroleka | 678.73 mi (1,092.31 km) |
| Heerlen to Ostrow Mazowiecka | 690.73 mi (1,111.63 km) |
| Heerlen to Ostrow Wielkopolski | 513.72 mi (826.76 km) |
| Heerlen to Ostrowiec Swietokrzyski | 670.46 mi (1,078.99 km) |
| Heerlen to Ostrzeszow | 518.66 mi (834.70 km) |
| Heerlen to Oswiecim | 584.41 mi (940.51 km) |
| Heerlen to Otwock | 661.61 mi (1,064.75 km) |
| Heerlen to Ozarow Mazowiecki | 642.06 mi (1,033.30 km) |
| Heerlen to Ozimek | 533.90 mi (859.23 km) |
| Heerlen to Ozorkow | 577.03 mi (928.65 km) |
| Heerlen to Pabianice | 580.89 mi (934.86 km) |
| Heerlen to Parczew | 730.23 mi (1,175.19 km) |
