9 hours and 15 minutes
If you mean nonstop flights, the only ones currently are from Madrid or Barcelona to New York, Chicago, Atlanta, Philadelphia, Miami, and Washington (Dulles). The shortest scheduled flight duration is 8 hours and 20 minutes on Delta from Madrid to JFK. To Atlanta, 10h 20m (Delta); to Miami, 9h 55m (American). There aren't any further west in the USA, currently. So, to recap, it's 8h 20m to 10h and 20m, depending which nonstop flight you choose.
What is the duration of a flight from Miami to Punta Cana?
no
Orlando, FL (ORL) to Madrid (MAD) Shortest Flight Duration * 10 hours 45 mins * Via Miami International Apt, Miami (MIA) == == Orlando, FL (ORL) to Barcelona (BCN) Shortest Flight Duration * 11 hours 30 mins * Via Atlanta Hartsfield-Jackson Intl Apt, Atlanta (ATL)
About 13 and a half hours.
Washington, DC (WAS) to Madrid (MAD) Shortest Flight Duration: 9 hours 35 mins via Philadelphia
London (LON) to Miami, FL (MIA)Flight Duration 9 hours 5 mins
Departure point: Miami, FloridaDestination point: SingaporeEstimated flight duration: 20 hours, 38 minutes
Damascus (DAM) to Madrid (MAD)Shortest Flight Duration * 8 hours 40 mins * Via Frankfurt International Apt, Frankfurt (FRA)
2.5 hrs
11 hours
Departure point: Oakland, CaliforniaDestination point: Miami, FloridaEstimated flight duration: 5 hours, 21 minutes