You can of course go the Avianca LifeMiles route for this trip
There is availability for 3500 lifemiles each way in July
Total 7000
Buy 3000 per person for $60
Buy 4000 during the checkout process for $61.36
Taxes $14.27
Total $135.63 each
Or to answer the question, that seems like a regular gringo price for LIM CUZ RT