Quito's Aeropuerto Internacional Mariscal Sucre is 37km northeast of the city in a broad valley near Tababela. It's a modern facility with the longest runway in Latin America and the second-highest control tower (after Cancun); however, the terminal is significantly smaller than Guayaquil's. There is a tourist information booth in the arrivals hall, and a hotel in the terminal, Wyndham Quito Airport.
Taxi prices into the city center are fixed and cost $26 to Mariscal Sucre or the Old Town. After exiting customs there's a small kiosk with the rates conveniently posted. Depending on the time of day and traffic, the trip takes between 45 minutes and one hour 15 minutes.
Every half-hour, the Aeroservicios shuttle bus makes the 30-minute trip between the airport and Parque Bicentenario (the old airport) at the northern end of Avenida Amazonas. From here, taxis are cheaper into Mariscal Sucre or the Old Town, respectively only 9km or 15km away.
The least expensive and least convenient alternative is to take a public bus ($2) to or from the Río Coca bus terminal north of the Mariscal.