Question : Do prices change more for this route than others?
Answer : Prices for UIO to PHX do change much less than most. Remember, you can save by booking further in advance.
Question : How many days should you spend in Phoenix if you're flying in from Quito?
Answer : Of course you're not most people, but if you were, you'd stay roughly 33 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : The lowest-cost day to fly in February is Monday. Being flexible with your travel days garners you even more savings during your booking.