| Upminster to Opole | 767.57 mi (1,235.29 km) |
| Upminster to Orzesze | 810.52 mi (1,304.41 km) |
| Upminster to Osowa | 780.83 mi (1,256.63 km) |
| Upminster to Ostroda | 837.18 mi (1,347.31 km) |
| Upminster to Ostroleka | 903.04 mi (1,453.30 km) |
| Upminster to Ostrow Mazowiecka | 917.74 mi (1,476.97 km) |
| Upminster to Ostrow Wielkopolski | 752.01 mi (1,210.25 km) |
| Upminster to Ostrowiec Swietokrzyski | 912.55 mi (1,468.61 km) |
| Upminster to Ostrzeszow | 758.97 mi (1,221.45 km) |
| Upminster to Oswiecim | 832.68 mi (1,340.07 km) |
| Upminster to Otwock | 894.92 mi (1,440.24 km) |
| Upminster to Ozarow Mazowiecki | 874.57 mi (1,407.49 km) |
| Upminster to Ozimek | 779.50 mi (1,254.48 km) |
| Upminster to Ozorkow | 812.07 mi (1,306.90 km) |
| Upminster to Pabianice | 818.72 mi (1,317.60 km) |
