You no longer have to pay an airport fee of when leaving Quito by air (2/2011). As of February 2011 international fares should already include the tax in the price of the ticket.
Near the baggage area of the Quito airport, it is possible to buy vouchers that can be used for a taxi ride. As of 2007, the cost to go to the tourist hotel zone was $5.
If you wish to try taking a bus instead of a taxi to the Mariscal (main tourist destination) section of Quito (it is not advisable if you have much luggage or are not familiar with Quito), which is often referred to as "gringolandia" by tourists or "la zona" by locals, you can exit the airport, cross the main street, and board any bus with "J.L. Mera" or "Juan L. Mera" on the sign. The cost is USD $0.25, but if you are a student under 18 or a senior citizen over 65 then it is USD $0.12.
A new, large international airport is presently under construction in a valley located in the northeast of Quito. It will be well outside the city between the towns of Tababela and Puembo, approx. 25 kms from the city. It will feature a one of the longest runways in Latin America: 4,100 meters long by 45 meters wide, that will allow an average of 44 take-offs and landings per hour. The airport is expected to start its operations in mid-2011.