One-way versus return airfare tickets
I'm looking for plane trips that would suit me if I studied abroad in the US.
I searched up the flight I'd take: SVG - ATL, and was amazed to see the prices were minimum $1500 for a one-way flight in August. I then checked what the price would be for a round-trip flight, from 12. Aug to 02. Dec, and suddenly the price sunk to $1175 in total! I repeated the search on another site, and saw that they found an even cheaper round flight of around $903.
So, I'm wondering, am I misunderstanding something, or is it really cheaper with round flights? How come??