| Houston to Glyka Nera | 6,330.41 mi (10,187.80 km) |
| Houston to Grevena | 6,137.94 mi (9,878.06 km) |
| Houston to Ialysos | 6,579.00 mi (10,587.87 km) |
| Houston to Ilion | 6,322.41 mi (10,174.94 km) |
| Houston to Ilioupoli | 6,328.98 mi (10,185.51 km) |
| Houston to Ioannina | 6,132.58 mi (9,869.44 km) |
| Houston to Irakleio | 6,504.54 mi (10,468.05 km) |
| Houston to Irakleio | 6,324.41 mi (10,178.16 km) |
| Houston to Kaisariani | 6,327.74 mi (10,183.52 km) |
| Houston to Kalamaria | 6,177.64 mi (9,941.95 km) |
| Houston to Kalamata | 6,300.21 mi (10,139.21 km) |
| Houston to Kallithea | 6,326.16 mi (10,180.97 km) |
| Houston to Kalymnos | 6,504.80 mi (10,468.46 km) |
| Houston to Kalyvia Thorikou | 6,340.38 mi (10,203.85 km) |
| Houston to Kamatero | 6,321.72 mi (10,173.82 km) |
