DL424

Between its first and last recorded date on JFK → DEN, DL424 averaged about 5 operations a week (630 in 961 days, cancelled ones included).

DL424 arrived on time 69.8% of the time, against 73.6% for all JFK → DEN flights, so this departure is 3.8 percentage points worse than the route as a whole. Against Delta Air Lines’ own flights on this route it is 7.8 points worse.

Source: US DOT Bureau of Transportation Statistics · 630 operations, January 2024 – August 2026 · If DL424 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.

DL424 cancelled 18 of 630 operations (2.86%), above the 2.26% for JFK → DEN.

14.4% of DL424’s arrivals were an hour or more late, against 10.6% across JFK → DEN, so the long delays are more common on this number than on the route.

Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026

Share of the delay minutes US DOT attributed to each cause for DL424 on JFK → DEN. Only delays of 15 minutes or more are attributed. What the five causes mean

Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026

The aircraft flying DL424 came in 15 or more minutes late on 25% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.

Matched by tail number to the aircraft’s previous flight into JFK: 294 of 612 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.

Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026

DL424 pushes back an average of 27.7 minutes late and reaches the gate at DEN an average of 15.6 minutes late. The 12.2 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. It spends 36.5 minutes on the taxiways at JFK, 2.0 minutes longer than a typical JFK departure in the same hour.

On arrival at DEN, DL424 spends 10.6 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at DEN spends on the ground before reaching the gate.

Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 22,116 JFK departures. Taxi-in is landing to gate, set against 991,579 arrivals at DEN. More on taxi time.

Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026

DL424 is scheduled out of JFK at 7:55 PM, in the 7 PM–8 PM bank. Departures from JFK in that hour arrive on time 69.0% of the time against 76.7% across the airport’s whole day — the slot alone is worth 7.8 points worse before anything about this particular flight is considered.

Both airport figures cover every destination from JFK, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.

Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026 · Hours below 120 departures are not scored.

The figures above describe only JFK → DEN, the route DL424 flies now.

Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026

Among all 3 departures on this route with at least 600 operations, DL424 has the 2nd highest on-time rate, 15.5 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.

• B697 JFK→DEN JetBlue on the same route, departs 8:20 PM, on time 59.9%
• DL532 JFK→DEN Delta Air Lines on the same route, departs 8:30 AM, on time 85.3%
• DL336 DEN→JFK Return trip, DEN to JFK, departs 6:40 AM, on time 88.1%