Compare the airlines themselves

Every reporting U.S. marketing carrier files its on-time performance with the Department of Transportation. These tools rank those carriers against each other on their own numbers — arrival reliability, cancellations, and diversions — over the trailing months of the federal record, with nothing added or smoothed.

On-time rate never travels alone here. A carrier can lift its number by cancelling the flights it would have flown late, so the cancellation rate sits beside it — the two figures only mean something together.