By plane
Portugal's largest international airport is the Aeroporto da Portela (http://www.lisbon-airport.com) IATA: LIS. It is located between Loures and Lisboa. Alameda das Comunidades Portuguesas, Tel: +350 21 841-3000, Fax: +351 21 841-3675, (http://www.ana-aeroportos.pt)
It is the main air hub for TAP Portugal (http://www.flytap.com), a Star Alliance (http://www.staralliance.com) member airline that covers an extensive network throughout Europe, Africa Morroco, Algerie, Senegal, Guine Bissau, Mozambique, South Africa, Angola, Cape Verde, S. Tome e Principe and the Americas US, Venezuela and Brazil. SATA Air Açores (http://www.sata.pt) provides seasonal service to eastern North America Boston, Montreal and Toronto.
There are also several other airlines flying into Lisbon, such as United Airlines, US Airways, British Airways, Air France, Egypt Air, Turkish Airlines, Lufthansa, Finnair, Iberia, Easyjet and KLM.
By bike
From airport: Due to the relative proximity of Lisbon's airport to the city center, it is quite easy to cycle from the airport to the center, and could be recommended if you arrive for a cycling trip.
After leaving the airport and negotiating a roundabout, merge onto the long and straight dual-carriageway Av. Almirante Gago Coutinho you should be able just to follow the "Centro" ("Downtown" signs.) After merging, the route to Baixa is simple and straight. This street later turns into Av. Almirante Reis, and then Rua de Palma, at the end of which you will be right in Baixa.
Cycling outside Lisbon can be a challenge, as Lisbon offers far easier cycling than what you may find outside of the city. The further you get from Lisbon however, the easier the cycling gets. You may wish to take advantage of certain regional trains that take bicycles in a separate luggage carriage, allowing you to start your cycling some 50 or 100 kilometers outside of the city.
More Below at Getting around by bicycle
By ship
You can get a boat to Lisbon from the following stations: Barreiro; Trafaria; Montijo; and Cacilhas. It's an excellent sightseeing opportunity crossing the river Tagus to Lisbon.
Many cruise ships dock at several places along the river on the Lisbon side, with variably good access to public transport throughout the city. Many lines offer shuttles to key points nearby.
By car
Lisbon can be accessed from six main highways. Coming from the south A2 or east A6 - the main route from Madrid, there are the two bridges:
From/to south: The A2 goes all the way to the 25 de Abril bridge, which usually has lots of traffic getting into Lisbon, especially on weekday mornings. This is the best option if you want to go to the center of Lisbon or to the west A5 - Estoril, Cascais, Sintra.
To north / to east: If you branch from the A2 into the A12, you'll get to the Vasco da Gama bridge, the longest bridge in Europe, it usually has less traffic than the older 25 de Abril bridge but a more expensive toll. This is the best option to go to the eastern/northern section of Lisbon to the airport and to the Parque das Nações - the former Expo 98 site, and also to take the A1 or A8 going north.
From/to north and the airport: Coming from the north, there is the A1, that connects Lisbon to Santarém, Fátima, Leiria, Coimbra, Aveiro, Porto. The A1 ends near the airport. There's also the A8, which goes to Torres Vedras, Caldas da Rainha, Alcobaça, Leiria.
From the west, there is the A5, which connects to Estoril, Cascais, and the IC19 that crosses all the suburbs and ends near Sintra.
Lisbon has three ring roads: The 2ª circular, which connects the A1 to the IC19; the CRIL IC17 still incomplete, which connects the Vasco da Gama bridge with the A1 and A8; and the CREL A9, which connects the A1 with the A8, IC19, A5, and goes all the way to the Estoril coast.
By bus
All nearby cities and most major cities in Portugal have direct buses to Lisbon. The main bus terminal is at Sete Rios metro: Jardim Zoológico.The main operator for long-course buses is Rede Nacional de Expressos (http://www.rede-expressos...)