hi all- this is my first post, so any help you can provide this newbie would be much appreciated!

i need to fly from LAX to BUE or EZE on january 6 with a flexible return date of around july 1 (i may or may not come back in july after a 5-month volunteer stint there). i am only finding flights for $1,100 on kayak... any suggestions on how to find something cheaper would be great! thanks!!