NKEWR→ORD

Spirit flew 156 of the 6,039 flights on EWR to ORD, about 3% of it. Its 53.8% on time is 18 points worse than the route as a whole, which runs 71.5%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from American at 77.8% to Republic at 52.8%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. American Airlines arrives on time 77.8% of the time; United Airlines manages 71.1%. Sample sizes sit next to every figure, because a two-point gap across 4,389 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. 26.9% 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 719 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 43.2% on time across 157 flights, 11 points below 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 11 points of difference.

One caution: this is a thin sample. 156 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.