| The Woodlands to Orbetello | 5,600.04 mi (9,012.40 km) |
| The Woodlands to Oria | 5,948.90 mi (9,573.83 km) |
| The Woodlands to Oristano | 5,578.91 mi (8,978.39 km) |
| The Woodlands to Orta Nova | 5,834.11 mi (9,389.09 km) |
| The Woodlands to Orte | 5,649.19 mi (9,091.49 km) |
| The Woodlands to Ortona | 5,738.27 mi (9,234.85 km) |
| The Woodlands to Orvieto | 5,627.63 mi (9,056.80 km) |
| The Woodlands to Orzinuovi | 5,436.58 mi (8,749.34 km) |
| The Woodlands to Osimo | 5,655.57 mi (9,101.76 km) |
| The Woodlands to Ospitaletto | 5,436.68 mi (8,749.50 km) |
| The Woodlands to Ostuni | 5,937.08 mi (9,554.80 km) |
| The Woodlands to Ottaviano | 5,801.18 mi (9,336.09 km) |
| The Woodlands to Ovada | 5,410.42 mi (8,707.22 km) |
| The Woodlands to Ozieri | 5,572.54 mi (8,968.13 km) |
| The Woodlands to Paceco | 5,829.61 mi (9,381.85 km) |
