Go on line and find taxi or private van transfer companies in Lisbo. We booked one and they were waiting for us. I think it was 45E cash. The drive is not long. Barring traffic.
The airport is insane to get through. Our female driver got us a cart and boy was it needed for our heavy suitcases. We asked directions to the Delta check in /baggage drop off many times. Way in the back with just two counters. The airport is full of shops on the way to your gate another nightmare to navigate. We had plenty of time for a coffee and pastry while waiting to board our flight.