| Buffalo Grove to Olivares | 4,183.29 mi (6,732.35 km) |
| Buffalo Grove to Olivenza | 4,092.87 mi (6,586.83 km) |
| Buffalo Grove to Olot | 4,386.29 mi (7,059.06 km) |
| Buffalo Grove to Onate | 4,144.70 mi (6,670.26 km) |
| Buffalo Grove to Onda | 4,352.88 mi (7,005.29 km) |
| Buffalo Grove to Onteniente | 4,381.68 mi (7,051.62 km) |
| Buffalo Grove to Orihuela | 4,395.08 mi (7,073.19 km) |
| Buffalo Grove to Osuna | 4,238.63 mi (6,821.42 km) |
| Buffalo Grove to Ourense | 3,930.36 mi (6,325.31 km) |
| Buffalo Grove to Oviedo | 3,984.52 mi (6,412.47 km) |
| Buffalo Grove to Paiporta | 4,366.65 mi (7,027.45 km) |
| Buffalo Grove to Pajara | 4,145.22 mi (6,671.09 km) |
| Buffalo Grove to Palafolls | 4,417.36 mi (7,109.05 km) |
| Buffalo Grove to Palafrugell | 4,425.18 mi (7,121.63 km) |
| Buffalo Grove to Palamos | 4,426.53 mi (7,123.81 km) |
