NKDFW→LAX

Spirit flew 505 of the 6,238 flights on DFW to LAX, about 8% of it. Its 80.2% on time is 8 points better than the route as a whole, which runs 72.1%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Delta at 87.9% to American at 68.3%.

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.9% of the time; American Airlines manages 68.3%. Sample sizes sit next to every figure, because a two-point gap across 4,568 flights means less than a ten-point one.

6.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The 1,235 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 74.0% on time across 503 flights, 6 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 6 points of difference.

One caution: this is a thin sample. 505 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.