The best price found from United States to Lisbon is on September 22nd, 2016, travelling with . See more options, compare prices and book: search flights.
Situated around 6km north of the centre, the ultramodern Aeroporto de Lisboa operates direct flights to major international hubs including London, New York, Paris and Frankfurt. Several low-cost carriers (Easyjet, Ryanair, Transavia, Norwegian etc) leave from the less-efficient terminal 2 – you'll need to factor in extra time for the shuttle ride if arriving at the airport on the metro.
The AeroBus departs from outside arrivals (adult/child €3.50/2, 25 to 35 minutes, roughly every 20 minutes from 7am to 11pm). It goes via Marquês de Pombal, Avenida Liberdade, Restauradores, Rossio and Praça do Comércio to Cais do Sodré. The ticket gives free passage on the entire city bus network for the rest of the day. You'll save 10% by purchasing your tickets online in advance.
The Aeroporto metro station allows convenient access to downtown. Change at Alameda (green line) to reach Rossio and Baixa.
Expect to pay about €15 for the 15-minute taxi ride into central Lisbon, plus €1.60 if your luggage needs to be placed in the boot. Avoid long queues by flagging down a taxi outside the departures hall. Make sure the cabbie switches on the taxi meter, and that you pay the listed fare.