| Montesilvano to Octeville | 899.77 mi (1,448.04 km) |
| Montesilvano to Oignies | 762.41 mi (1,226.98 km) |
| Montesilvano to Oissel | 783.28 mi (1,260.56 km) |
| Montesilvano to Olivet | 700.47 mi (1,127.29 km) |
| Montesilvano to Ollioules | 422.75 mi (680.36 km) |
| Montesilvano to Olonne-sur-Mer | 830.33 mi (1,336.28 km) |
| Montesilvano to Oloron-Sainte-Marie | 747.92 mi (1,203.66 km) |
| Montesilvano to Onet Village | 593.14 mi (954.56 km) |
| Montesilvano to Onnaing | 739.01 mi (1,189.33 km) |
| Montesilvano to Orange | 482.37 mi (776.30 km) |
| Montesilvano to Orchies | 754.50 mi (1,214.26 km) |
| Montesilvano to Orleans | 701.35 mi (1,128.71 km) |
| Montesilvano to Orly | 711.37 mi (1,144.84 km) |
| Montesilvano to Ormesson-sur-Marne | 707.40 mi (1,138.46 km) |
| Montesilvano to Orsay | 717.57 mi (1,154.82 km) |
