First, you must get to mainland Ecuador by flying into either the Quito or Guayaquil.
From Quito & Guayaquil, you take an airplane to Baltra or San Cristobal. There are few options, fly over Guayaquil to save time, since most flights from Quito have a stopover in Guayaquil on the way to the Galapagos.
There is also a possibility to fly direct from Quito to Galapagos, but you must check first the flight with the airlines.
There is tree airline company’s ho fly to Galapagos Islands, TAME, LATAM & AVIANCA.