From the Airport to the City you have two options..and if you are wearing a backpack, carrying luggage and of course your ATM Card, some cash and travel documents I would recommend option one heartily 1. Taxis Autorizados a booth in the airport where you pay for a taxi, fare is by zone, you receive a receipt, get in line and give to the driver upon getting into the cab..usually $7-$14 USD equiv. in Pesos depending your zone 2. Is the Metro Station, about a 300 meter walk from the terminal, if you're going to take the Metro, it's crowded, almost all day, and a lot of pickpockets. The Metro is nice once you've arrived, unpacked and have your passport and valubles in locker or hotel safe, (never carry much cash on the Metro) The Metro, City buses and private 'Combis' will allow you to travel anywhere and everywhere cheaply in Mexico City.