| Glendale Heights to Octeville | 3,965.14 mi (6,381.28 km) |
| Glendale Heights to Oignies | 4,116.18 mi (6,624.35 km) |
| Glendale Heights to Oissel | 4,082.03 mi (6,569.39 km) |
| Glendale Heights to Olivet | 4,165.66 mi (6,703.99 km) |
| Glendale Heights to Ollioules | 4,504.01 mi (7,248.50 km) |
| Glendale Heights to Olonne-sur-Mer | 4,063.35 mi (6,539.33 km) |
| Glendale Heights to Oloron-Sainte-Marie | 4,230.94 mi (6,809.03 km) |
| Glendale Heights to Onet Village | 4,322.07 mi (6,955.71 km) |
| Glendale Heights to Onnaing | 4,141.95 mi (6,665.82 km) |
| Glendale Heights to Orange | 4,422.09 mi (7,116.67 km) |
| Glendale Heights to Orchies | 4,125.48 mi (6,639.33 km) |
| Glendale Heights to Orleans | 4,164.62 mi (6,702.31 km) |
| Glendale Heights to Orly | 4,153.77 mi (6,684.84 km) |
| Glendale Heights to Ormesson-sur-Marne | 4,157.97 mi (6,691.60 km) |
| Glendale Heights to Orsay | 4,147.36 mi (6,674.53 km) |
