| West Chicago to Nyon | 4,399.19 mi (7,079.81 km) |
| West Chicago to Oberriet | 4,491.68 mi (7,228.67 km) |
| West Chicago to Obersiggenthal | 4,436.18 mi (7,139.34 km) |
| West Chicago to Oberwil | 4,406.79 mi (7,092.04 km) |
| West Chicago to Oberwingert | 4,453.25 mi (7,166.81 km) |
| West Chicago to Oftringen | 4,428.44 mi (7,126.89 km) |
| West Chicago to Olten | 4,426.49 mi (7,123.75 km) |
| West Chicago to Onex | 4,401.67 mi (7,083.80 km) |
| West Chicago to Opfikon | 4,448.82 mi (7,159.69 km) |
| West Chicago to Ostermundigen | 4,426.10 mi (7,123.12 km) |
| West Chicago to Payerne | 4,409.84 mi (7,096.95 km) |
| West Chicago to Pfaffikon | 4,459.76 mi (7,177.29 km) |
| West Chicago to Plan-les-Ouates | 4,402.97 mi (7,085.90 km) |
| West Chicago to Pratteln | 4,412.26 mi (7,100.85 km) |
| West Chicago to Prilly | 4,407.81 mi (7,093.68 km) |
