I'm not sure of a bus from DTD to the outlets. I checked the Lynx schedules/maps and the buses only seem to drop you across the street from where the outlets sort of are - but it would still be at least a 20 minute walk. I would recommend taxi for this. By car, it's probably about 15-20 minutes from DTD, considering traffic is decent. It is a high tourist area and there are many apartments back there, so if you go during a busy time of the day you could be in the car for closer to 30 minutes.