From Latin America There are regular flights from Bogota, Caracas, Lima, and Santiago de Chile to both Quito and Guayaquil. There are also flights from Sao Paulo and Manaus, Brazil. From Central America there is a daily flight from San Jose, Costa Rica and from Panama. There are few deals to be had when flying between Latin American countries. Trans-border fares between Latin American cities can easily cost as much as flying from North America, despite the shorter distances.
Many travelers prefer to fly to the border and cross the border by bus in order to save money.
The peak tourist seasons are from June 15 to September 30 and December 15 to 24. Expect to pay a lot more for your ticket if you intend to fly during these periods. The earlier your buy your ticket the less you will have to pay. The exception for this is last minute tickets sold by consolidator companies, these can often offer great savings. An international student card entitles you to discounts on economy-class airfare.