Distance from Portugal to United States. The total distance from Portugal to United States is 4,591 miles. This is equivalent to 7 388 kilometers or 3,989 nautical miles. Your trip begins in Portugal. It ends in the United States. Your flight direction from Portugal to United States is Northwest (-59 degrees from North). The distance calculator helps you figure out how far it is to fly from Portugal to United States. It does this by computing the straight line flying distance (as the crow flies).