Flight number record
YX 4573
Republic Airways · New York to Raleigh
- Route
- JFK → RDU
- Departs
- 21:00
- Flights
- 315
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4573, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
YX 4573 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 315 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so YX 4573 runs 10 points behind the country as a whole. Across a thousand flights that is about 98 extra late arrivals.
Key figures
On time
67.5%
Arrivals under 15 minutes late, of 283 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
10.16%
National rate is 1.89%
1 hour+ late
12.7%
National rate is 8.3%
These figures cover 315 flights between September 2025 and August 2026. Beyond the headline rate, 12.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 4573 flies
YX 4573 flies JFK to RDU without a single fixed slot. Its most common scheduled departure was 21:00, used on 54 of 315 flights, with 21:59 (41 flights) and 21:30 (39 flights) next.
- Departs 21:0054 flights17.1%
- Departs 21:5941 flights13.0%
- Departs 21:3039 flights12.4%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 21:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and YX 4573 runs 3 points worse at 67.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
YX 4573 next to JFK to RDU
Every carrier on JFK to RDU combined arrived on time 72.4% of the time across 2,335 flights, so YX 4573 is 5 points behind it. Republic flew 1,376 flights on the same city pair under all its flight numbers, including this one, and those ran 75.0% on time. Across its whole network Republic Airways managed 78.1%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4573thin sample | 315 | 67.5% | 64 min | 10.16% | C− |
| All Republic Airways on JFK–RDU | 1,376 | 75.0% | 66 min | 6.32% | B− |
| All carriers on JFK–RDU | 2,335 | 72.4% | 75 min | 6.51% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4573 quarter by quarter
YX 4573 did not run the same all year. Its best quarter was Apr–Jun 2026 at 73.3% on time and its weakest Jul–Sep 2026 at 47.8%, a swing of 26 points on roughly 63 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights70.0%
- Oct–Dec 202586 flights70.0%
- Jan–Mar 202690 flights72.0%
- Apr–Jun 202647 flights73.3%
- Jul–Sep 202662 flights47.8%
Scale runs 40% to 80%.
By weekday, YX 4573 did best on Monday at 74.4% on time and worst on Sunday at 51.4%. Each day rests on about 45 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 4573 runs when it is late
The 92 late arrivals split 27 under half an hour, 29 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early64 flights22.6%
- Within 15 min127 flights44.9%
- 15–29 min late27 flights9.5%
- 30–59 min late29 flights10.2%
- 1–2 hours late23 flights8.1%
- 2+ hours late13 flights4.6%
Scale runs 0% to 100%.
Share of 283 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 69 departures that left 15 minutes late or more, only 4 made it up before arrival. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at RDU.
The worst days
Worst days for YX 4573
The latest arrival of the period was on 6 September 2025, 3 hours 40 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 September 2025 | 3 hours 40 minutes | Late-arriving aircraft |
| 4 September 2025 | 3 hours 31 minutes | Late-arriving aircraft |
| 3 July 2026 | 3 hours 27 minutes | Late-arriving aircraft |
| 1 February 2026 | 3 hours 24 minutes | National Airspace System |
| 12 March 2026 | 2 hours 40 minutes | Late-arriving aircraft |
Delay causes
Why YX 4573 runs late
Late-arriving aircraft accounts for 61% of the 5,852 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 28%National Airspace System
- 11%Carrier
- 0%Extreme weather
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,852 reported delay minutes here, that single category outweighs weather by 61 to one. The split is drawn from 5,852 delay minutes reported on YX 4573.
Cancellations run at 10.16%, against 1.89% nationally. That is about one flight in ten cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
12.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on two other city pairs in the data, including LGA to IND (38) and ORD to IAH (1), but none flew often enough under YX 4573 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to JFK to RDU only.
One caution: this is a thin sample. 315 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.
What to do with this
Booking YX 4573
For a booking, the cancellation rate is the figure to plan around on YX 4573: 10.16% of its 315 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to RDU, every carrier and departure
- RDU to JFK, the return direction
- Republic Airways 4658 on the same route69.6%
- John F. Kennedy International (JFK) delay statistics
- Raleigh-Durham International (RDU) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.