| Pittsburgh to Ickenham | 3,700.30 mi (5,955.05 km) |
| Pittsburgh to Ifield | 3,721.08 mi (5,988.50 km) |
| Pittsburgh to Ilford | 3,721.63 mi (5,989.39 km) |
| Pittsburgh to Ilfracombe | 3,560.48 mi (5,730.03 km) |
| Pittsburgh to Ilkeston | 3,631.68 mi (5,844.63 km) |
| Pittsburgh to Ilkley | 3,589.82 mi (5,777.26 km) |
| Pittsburgh to Immingham | 3,658.73 mi (5,888.15 km) |
| Pittsburgh to Ince-in-Makerfield | 3,568.35 mi (5,742.70 km) |
| Pittsburgh to Inverness | 3,429.53 mi (5,519.29 km) |
| Pittsburgh to Inverurie | 3,499.41 mi (5,631.76 km) |
| Pittsburgh to Ipswich | 3,751.02 mi (6,036.68 km) |
| Pittsburgh to Irlam | 3,577.35 mi (5,757.19 km) |
| Pittsburgh to Irthlingborough | 3,674.59 mi (5,913.68 km) |
| Pittsburgh to Irvine | 3,446.92 mi (5,547.28 km) |
| Pittsburgh to Islington | 3,714.46 mi (5,977.85 km) |
