How long is the flight from Boston to madrid? The flight from Boston, Massachusetts, to Madrid, Spain, typically takes around 7 to 9 hours. However, the exact duration can vary based on factors such as specific flight routes, weather conditions, and air traffic. Keep in mind that this is a long-haul international flight covering a distance of approximately 3,500 miles (5,600 kilometres). So, settle in, relax, and prepare for an exciting journey from the bustling city of Boston to the lively capital of Spain, Madrid.