Lisbon Airport does not have a train station. There are plans to connect the airport to the metro system of Lisbon, but this will not be realized until early 2010.
Car and bus
Portela Airport is easily accessible, the airport lies along the A1 that connects Lisbon to Porto. From Cascais/Estoril you follow highway A5, the airport is clearly indicated by signs on the A1 as well as the A5, follow the ring road 2a. The roads and the directions to the airport can be confusing. There will be improvements, but temporarily the situation will not be made clearer.
There is a special shuttle bus, Carris number 91, one-way costs €1.30, that takes passengers to the center of Lisbon in 20 minutes, the bus also stops at Cais do Sodré Train Station.
Another shuttle bus, Scotturb, costs €9.00, connects the airport with places such as Estoril. You can purchase a ticket with the driver for both of the shuttle buses.
There are town bus lines: 5, 22, 44, 45 and 83 to Lisbon.
Car Rental - Lisbon Portela Airport
In the Arrivals Hall of Lisbon Airport you can find counters for various car rental companies which are: AA Castanheira/Budget, Auro Rent, Auto Jardim, Avis, Europcar, Hertz, National/Alamo and Sixt. You can also reserve a rental car in advance using the service EasyTerra provides, they compare the rates of several providers in a single quote.
There are always plenty of taxis at the Arrivals and Departures Halls. All the taxis have meters, a ride to Lisbon costs approximately €10.00, depending on the traffic. During weekends, nights, and holidays there is a 20% surcharge.
There are two covered parking garages for short-term parking, P1 is by the Departures Hall and P2 is by the Arrivals Hall, P3 is reserved for long-term parking and is further away, a shuttle bus takes you to the terminals.