When looking up flight prices, I noticed it costs ~ $365 roundtrip from NYC to Managua, Nicaragua and ~ $700 roundtrip from Managua to NYC.
I assume there are similar situations from other major airports in South America.
Is this because NYC is a very popular destination whereas these cities in South America might not get as much traffic?
Also, is it legal (although I know in this situation you wouldn't be saving money) to buy a round trip from NYC to MGA and only take the return flight to get to NYC from MGA?