| Irthlingborough to Silver Firs (Washington) | 4,707.54 mi (7,576.05 km) |
| Irthlingborough to Silver Spring (Maryland) | 3,622.44 mi (5,829.75 km) |
| Irthlingborough to Silver Springs Shores (Florida) | 4,304.18 mi (6,926.90 km) |
| Irthlingborough to Silverdale (Washington) | 4,732.68 mi (7,616.51 km) |
| Irthlingborough to Silverton (Oregon) | 4,888.67 mi (7,867.55 km) |
| Irthlingborough to Simi Valley (California) | 5,391.15 mi (8,676.21 km) |
| Irthlingborough to Simpsonville (South Carolina) | 4,035.42 mi (6,494.38 km) |
| Irthlingborough to Sioux City (Iowa) | 4,194.25 mi (6,749.99 km) |
| Irthlingborough to Sioux Falls (South Dakota) | 4,154.72 mi (6,686.38 km) |
| Irthlingborough to Skokie (Illinois) | 3,899.99 mi (6,276.43 km) |
| Irthlingborough to Sleepy Hollow (New York) | 3,402.02 mi (5,475.02 km) |
| Irthlingborough to Slidell (Louisiana) | 4,559.69 mi (7,338.11 km) |
| Irthlingborough to Smithfield (North Carolina) | 3,839.29 mi (6,178.74 km) |
| Irthlingborough to Smithfield (Utah) | 4,747.20 mi (7,639.88 km) |
| Irthlingborough to Smithville (Missouri) | 4,282.92 mi (6,892.70 km) |
