Delta and United have round-trip flights from Austin (AUS) to Quito (UIO) for $430 with a connection. Flights in August, October, November, December, January, February, March, and April. Extended Weekends available.
Note: Fare is “Regular Economy”; carry-on bag, and personal item are included in the price. United allows for free seat selection.
Note: Aeromexico has flights for slightly cheaper, but those don’t allow for a free carry-on and have long connection times.