There are several options to travel from the aiport to city center.
Terminal 2 is departures only. Although you arrive officially at terminal 2 (the airplane actually stops near terminal 2) you will be transported directly to terminal 1 where the arrivals hall and the checked in luggage belts are. From there you can either get the subway, bus or a taxi.
For departure the process is a bit different. You will depart from terminal 2. You can use all of the transports mentioned but both subway and regular bus will leave you at terminal 1. Aerobus (a dedicated bus service) also goes to terminal 2.
From terminal 1 to terminal 2 there is a free airport bus. It departs every 10 minutes. The trip shouldn’t take more than 5 minutes between terminal 1 and 2.
http://www.ana.pt/en-US/Aeroportos/lisboa/Lisboa/Departures/Terminal2/Pages/Terminal2.aspx
Lisbon region has a transport planner. You can find it here:
http://www.transporlis.sapo.pt/Default.aspx?tabid=36&language=en-GB
It may be useful both to find routes from the airport and others.
Try this link. It’s already prepared with the route going downtown (restauradores). Just pick a date and hit calculate.
You can also find this information, with more details, at the airport website
Metro is best – really simple, cheap (compared to places like London or New York), and quick.
Just follow the ‘M’ logos to get to the airport Metro station. You need to take the pink line and change at S. Sebastiao, switching to the light blue line and getting off at Baixa-Chiado (the absolute centre of Lisbon).
Good luck – It’s a lovely city!
The metro network in Lisbon is very well developed and covers most, if not all, of the city. Indeed Lisbon airport has its own metro station. This means you can reach the city centre, say Baixa-Chiado, from the airport by changing at Alameda. Below is a screenshot of the metro journey planner for this route:
For more information on the metro system here is the official homepage.
The linked airport page shows other options including buses, airport shuttles and train. Rome2rio also shows a bunch of other options including bus, taxi, uber and even walking. In my opinion the metro remains the smartest option since it its schedule not subject to road traffic, and the tickets are cheaper.
The local Carris bus company runs a bus transport service connecting Lisbon’s airport to the city centre passing by the main transport hubs such as Comercio Square and Cais de Sodré.
This service is called AeroBus and passes by dozens of Lisbon hotels, thus providing tourists arriving at the airport with easy access to their accommodation.
An alternative to the bus is the metro or Lisbon airport taxi
I hope this helps.
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