| Illescas to Opole | 1,275.57 mi (2,052.83 km) |
| Illescas to Orzesze | 1,293.00 mi (2,080.89 km) |
| Illescas to Osowa | 1,427.52 mi (2,297.37 km) |
| Illescas to Ostroda | 1,451.53 mi (2,336.01 km) |
| Illescas to Ostroleka | 1,488.43 mi (2,395.39 km) |
| Illescas to Ostrow Mazowiecka | 1,492.76 mi (2,402.37 km) |
| Illescas to Ostrow Wielkopolski | 1,302.77 mi (2,096.60 km) |
| Illescas to Ostrowiec Swietokrzyski | 1,421.24 mi (2,287.26 km) |
| Illescas to Ostrzeszow | 1,299.43 mi (2,091.23 km) |
| Illescas to Oswiecim | 1,309.15 mi (2,106.88 km) |
| Illescas to Otwock | 1,448.49 mi (2,331.12 km) |
| Illescas to Ozarow Mazowiecki | 1,433.59 mi (2,307.14 km) |
| Illescas to Ozimek | 1,286.75 mi (2,070.83 km) |
| Illescas to Ozorkow | 1,368.32 mi (2,202.10 km) |
| Illescas to Pabianice | 1,362.14 mi (2,192.15 km) |
