| National City to Superior (Colorado) | 831.94 mi (1,338.87 km) |
| National City to Superior (Wisconsin) | 1,634.11 mi (2,629.85 km) |
| National City to Surprise (Arizona) | 277.73 mi (446.96 km) |
| National City to Susanville (California) | 570.11 mi (917.51 km) |
| National City to Sussex (Wisconsin) | 1,721.09 mi (2,769.83 km) |
| National City to Suwanee (Georgia) | 1,900.30 mi (3,058.23 km) |
| National City to Swansea (Illinois) | 1,570.00 mi (2,526.67 km) |
| National City to Sweetwater (Florida) | 2,253.25 mi (3,626.25 km) |
| National City to Sweetwater (Texas) | 970.88 mi (1,562.49 km) |
| National City to Sycamore (Illinois) | 1,679.11 mi (2,702.27 km) |
| National City to Sylacauga (Alabama) | 1,782.36 mi (2,868.44 km) |
| National City to Sylvania (Ohio) | 1,927.05 mi (3,101.30 km) |
| National City to Syosset (New York) | 2,452.28 mi (3,946.56 km) |
| National City to Syracuse (New York) | 2,320.62 mi (3,734.68 km) |
| National City to Syracuse (Utah) | 644.47 mi (1,037.18 km) |
