YX4551

YX4551 arrived on time 80.7% of the time, against 78.7% for all DCA → JFK flights, so this departure is 2.0 percentage points better than the route as a whole. Against Republic Airways’ own flights on this route it is 2.1 points better.

YX4551’s scheduled departure has moved during the period FlyerIntel has on file: it typically left around 12:30 PM earlier on, and around 6:00 AM more recently — a 390-minute shift, not the few minutes of day-to-day rounding every published schedule carries. Confirm the current departure time before booking around an older listing.

Source: US DOT Bureau of Transportation Statistics · 666 operations, July 2023 – July 2026 · If YX4551 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.

YX4551 has cancelled 1.80% of its scheduled departures (12 of 666), against 4.60% for all DCA → JFK flights — this specific departure cancels 2.8 percentage points less often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about YX4551 specifically, not about the route it flies.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026

Share of the delay minutes US DOT attributed to each cause for YX4551 on DCA → JFK. Only delays of 15 minutes or more are attributed.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

When the aircraft came in 15 or more minutes late, YX4551 pushed back an average of 11 minutes late; when it came in on time or early, an average of 2 minutes late.

Each departure is matched to the flight the same aircraft flew into DCA just before it, using the tail number in the DOT file, 617 of 655 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

YX4551 pushes back an average of 5.0 minutes late and reaches the gate at JFK an average of 2.0 minutes late. The 3.0 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 24.9 minutes on the taxiways at DCA, 7.0 minutes longer than a typical DCA departure in the same hour.

On arrival at JFK, YX4551 spends 12.6 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 1.1 minutes longer than a typical JFK arrival (11.5 min).

Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached JFK. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 31,497 departures from DCA scheduled in the clock hour YX4551 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at JFK (351,546 flights), not just YX4551’s own. More on taxi time.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026

YX4551 is scheduled out of DCA at 6:00 AM, in the 6 AM–7 AM bank. Departures from DCA in that hour arrive on time 90.8% of the time against 76.5% across the airport’s whole day — the slot alone is worth 14.3 points better before anything about this particular flight is considered.

The two airport figures cover every departure from DCA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.

Because the same number has served different journeys, the statistics above describe only the route YX4551 currently operates. Blending them would produce an average of two different flights.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. YX4551 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.

• YX4781 DCA→JFK Republic Airways on the same route, departs 2:54 PM, on time 66.0%
• YX5713 DCA→JFK Republic Airways on the same route, departs 5:00 PM, on time 69.4%
• YX4538 JFK→DCA Return trip, JFK to DCA, departs 6:30 AM, on time 84.7%
• YX4763 DCA→PIT Republic Airways flight out of DCA, DCA to PIT, departs 10:00 PM, on time 75.5%