| Portland to Glyka Nera | 6,301.52 mi (10,141.32 km) |
| Portland to Grevena | 6,117.09 mi (9,844.50 km) |
| Portland to Ialysos | 6,489.16 mi (10,443.29 km) |
| Portland to Ilion | 6,295.74 mi (10,132.02 km) |
| Portland to Ilioupoli | 6,303.17 mi (10,143.97 km) |
| Portland to Ioannina | 6,130.97 mi (9,866.84 km) |
| Portland to Irakleio | 6,498.05 mi (10,457.60 km) |
| Portland to Irakleio | 6,296.09 mi (10,132.57 km) |
| Portland to Kaisariani | 6,301.11 mi (10,140.66 km) |
| Portland to Kalamaria | 6,117.94 mi (9,845.87 km) |
| Portland to Kalamata | 6,324.40 mi (10,178.13 km) |
| Portland to Kallithea | 6,301.05 mi (10,140.56 km) |
| Portland to Kalymnos | 6,429.54 mi (10,347.34 km) |
| Portland to Kalyvia Thorikou | 6,313.06 mi (10,159.88 km) |
| Portland to Kamatero | 6,294.32 mi (10,129.72 km) |
