What are your favorite airfare finder/alert websites for last minute plane tix to MCO?
Google flights, is, as far as I know, the best. You can track more airlines than others (Delta is included and Jet Blue, unlike Hopper) and is pretty good about guiding you through the cheapest way.
You will still need to manually check Southwest. Kayak and Expedia are not bad either.
We like Sky Scanner, too. Not sure about MCO but it gives lots of options for obscure airports which is helpful for us, living where we live.