NKMCO→SJU

Spirit flew 611 of the 6,054 flights on MCO to SJU, about 10% of it. Its 70.9% on time is 2 points worse than the route as a whole, which runs 73.0%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from JetBlue at 76.4% to Southwest at 69.8%.

The choice of carrier is not cosmetic here. JetBlue Airways arrives on time 76.4% of the time; Southwest Airlines manages 69.8%. Sample sizes sit next to every figure, because a two-point gap across 2,067 flights means less than a ten-point one.

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 1,188 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 77.1% on time across 611 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.

One caution: this is a thin sample. 611 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.