Upside down airfare prices

I can't wait to see my mother in law in Florida this year. We looked into airplane tickets online and what's really funny is if you get a one way ticket there and then a one way ticket back it's actually cheaper than a round trip. Makes absolutely no sense at all usually it's the other way around. It is not a lot of savings but all savings count these days. For three of us the total saving is fifty six dollars by doing it this way. Hey fifty six dollars helps pay for the luggage.