25 minutes by Uber or Bolt from the airport (around 20€) or 20 minutes from city center of Lisbon.

By bus/Tram : 18 minutes to Trafaria pier (Boat To Belem) 30 minutes to Pragal Station (trains to Algarve or Lisbon), 40 minutes to Cacilhas pier (Boat To Cais do Sobre). Use Carris Metroplitana App or Google Maps for schedules in real time.