| Irthlingborough to Port Chester (New York) | 3,397.68 mi (5,468.03 km) |
| Irthlingborough to Port Hueneme (California) | 5,411.45 mi (8,708.89 km) |
| Irthlingborough to Port Huron (Michigan) | 3,655.13 mi (5,882.36 km) |
| Irthlingborough to Port Lavaca (Texas) | 4,916.86 mi (7,912.92 km) |
| Irthlingborough to Port Neches (Texas) | 4,740.60 mi (7,629.26 km) |
| Irthlingborough to Port Orange (Florida) | 4,263.07 mi (6,860.75 km) |
| Irthlingborough to Port Orchard (Washington) | 4,740.72 mi (7,629.46 km) |
| Irthlingborough to Port Royal (South Carolina) | 4,088.47 mi (6,579.76 km) |
| Irthlingborough to Port Salerno (Florida) | 4,328.23 mi (6,965.61 km) |
| Irthlingborough to Port St. John (Florida) | 4,286.59 mi (6,898.60 km) |
| Irthlingborough to Port St. Lucie (Florida) | 4,329.72 mi (6,968.00 km) |
| Irthlingborough to Port Washington (New York) | 3,405.85 mi (5,481.19 km) |
| Irthlingborough to Port Washington (Wisconsin) | 3,842.36 mi (6,183.68 km) |
| Irthlingborough to Port Wentworth (Georgia) | 4,116.69 mi (6,625.17 km) |
| Irthlingborough to Portage (Indiana) | 3,900.05 mi (6,276.52 km) |
