| Pittsburgh to Nyon | 4,125.87 mi (6,639.95 km) |
| Pittsburgh to Oberriet | 4,232.16 mi (6,811.01 km) |
| Pittsburgh to Obersiggenthal | 4,174.45 mi (6,718.14 km) |
| Pittsburgh to Oberwil | 4,143.39 mi (6,668.15 km) |
| Pittsburgh to Oberwingert | 4,192.89 mi (6,747.81 km) |
| Pittsburgh to Oftringen | 4,164.78 mi (6,702.56 km) |
| Pittsburgh to Olten | 4,162.98 mi (6,699.67 km) |
| Pittsburgh to Onex | 4,126.86 mi (6,641.53 km) |
| Pittsburgh to Opfikon | 4,187.47 mi (6,739.07 km) |
| Pittsburgh to Ostermundigen | 4,159.23 mi (6,693.64 km) |
| Pittsburgh to Payerne | 4,140.79 mi (6,663.95 km) |
| Pittsburgh to Pfaffikon | 4,198.55 mi (6,756.92 km) |
| Pittsburgh to Plan-les-Ouates | 4,128.10 mi (6,643.54 km) |
| Pittsburgh to Pratteln | 4,149.25 mi (6,677.57 km) |
| Pittsburgh to Prilly | 4,136.27 mi (6,656.68 km) |
