| Flower Mound to Orbetello | 5,528.77 mi (8,897.69 km) |
| Flower Mound to Oria | 5,872.86 mi (9,451.45 km) |
| Flower Mound to Oristano | 5,519.48 mi (8,882.74 km) |
| Flower Mound to Orta Nova | 5,758.94 mi (9,268.11 km) |
| Flower Mound to Orte | 5,576.04 mi (8,973.77 km) |
| Flower Mound to Ortona | 5,662.28 mi (9,112.55 km) |
| Flower Mound to Orvieto | 5,554.14 mi (8,938.52 km) |
| Flower Mound to Orzinuovi | 5,358.21 mi (8,623.21 km) |
| Flower Mound to Osimo | 5,577.70 mi (8,976.44 km) |
| Flower Mound to Ospitaletto | 5,357.65 mi (8,622.30 km) |
| Flower Mound to Ostuni | 5,860.46 mi (9,431.50 km) |
| Flower Mound to Ottaviano | 5,729.42 mi (9,220.61 km) |
| Flower Mound to Ovada | 5,336.20 mi (8,587.78 km) |
| Flower Mound to Ozieri | 5,510.35 mi (8,868.05 km) |
| Flower Mound to Paceco | 5,769.55 mi (9,285.20 km) |
