How early to get to Quito airport for Galapagos flight?

You should get to the Quito airport 1.5 hrs before any Galapagos flight. The airlines may say to get there sooner but its a small airport and the process is straightforward. When checking in the airline will tell you what to do next, you need to wait in another line and pay a fee, then go through security, thats it! Also fill out a form.