Just for info:
Ren its about 3-4 minutes walk away from Jungfernstieg station.
S1 from Jungfernstieg station to HAM airport takes 28 minutes. S1 separates into 2 parts at Ohlsdorf station - front part of the train goes to the airport.
U1 from Jungfernstieg station takes 17 minutes to Ohlsdorf, there you must then change to S1 to get to the airport. S1 then needs 3 minutes to reach the airport.
Here you find the timetable for U1 and S1:
http://www.hvv.de/pdf/fahrplaene/fah...11.12.2011.pdf
http://www.hvv.de/pdf/fahrplaene/fah...11.12.2011.pdf