The fastest option from Lisbon Airport to the city center is to hire a private transfer between the airport and the city center. The second fastest option is via the Lisbon Metro where a single ticket costs €1.45 (US$ 1.50) per person.  The third way to get to the city from the airport is by using a taxi. It is best to purchase a pre-paid ticket to avoid last-minute surprises once you step into the taxi. To get to the city center, the taxi fare should not cost more than € 20 (US$ 20.90).