DLSLC→SAN

Delta flew 1,731 of the 2,958 flights on SLC to SAN, most of the route. Its 83.8% on time is about level with the route as a whole at 83.2%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Alaska at 100.0% to Southwest at 75.8%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 85.9% of the time; Southwest Airlines manages 75.8%. Sample sizes sit next to every figure, because a two-point gap across 408 flights means less than a ten-point one.

Badly late arrivals are rare here: only 4.1% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 626 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 88.7% on time across 1,732 flights, 5 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 5 points of difference.

The sample behind these figures is 1,731 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.