| Madrid to Opole | 1,256.63 mi (2,022.35 km) |
| Madrid to Orzesze | 1,274.50 mi (2,051.10 km) |
| Madrid to Osowa | 1,407.08 mi (2,264.47 km) |
| Madrid to Ostroda | 1,431.53 mi (2,303.82 km) |
| Madrid to Ostroleka | 1,468.88 mi (2,363.93 km) |
| Madrid to Ostrow Mazowiecka | 1,473.37 mi (2,371.16 km) |
| Madrid to Ostrow Wielkopolski | 1,283.32 mi (2,065.30 km) |
| Madrid to Ostrowiec Swietokrzyski | 1,402.68 mi (2,257.40 km) |
| Madrid to Ostrzeszow | 1,280.11 mi (2,060.13 km) |
| Madrid to Oswiecim | 1,290.79 mi (2,077.32 km) |
| Madrid to Otwock | 1,429.32 mi (2,300.28 km) |
| Madrid to Ozarow Mazowiecki | 1,414.32 mi (2,276.12 km) |
| Madrid to Ozimek | 1,267.86 mi (2,040.43 km) |
| Madrid to Ozorkow | 1,348.95 mi (2,170.92 km) |
| Madrid to Pabianice | 1,342.93 mi (2,161.24 km) |
