Flight number record

YX 4573

Republic Airways · New York to Raleigh

Route: JFK → RDU
Departs: 21:00
Flights: 315
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 315 flights, with a median arrival 5 minutes early.

The national on-time rate over the same period is 77.6%, so YX 4573 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 288 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

8.57%

National rate is 1.81%

1 hour+ late

12.2%

National rate is 8.1%

These figures cover 315 flights between July 2025 and June 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 71 of 315 flights, with 21:59 (41 flights) and 21:58 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:0071 flights22.5%
Departs 21:5941 flights13.0%
Departs 21:5837 flights11.7%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and YX 4573 runs level with that at 71.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

YX 4573 next to JFK to RDU

Every carrier on JFK to RDU combined arrived on time 75.9% of the time across 2,363 flights, so YX 4573 is 4 points behind it. Republic flew 1,438 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network Republic Airways managed 78.5%, which this flight trails by 7 points.

YX 4573 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4573thin sample	315	71.5%	66 min	8.57%	C−
All Republic Airways on JFK–RDU	1,438	78.6%	62 min	5.49%	B−
All carriers on JFK–RDU	2,363	75.9%	68 min	4.99%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 4573 quarter by quarter

Quarter by quarter YX 4573 held fairly steady: 71.6% in Jul–Sep 2025, 70.0% in Oct–Dec 2025, 72.0% in Jan–Mar 2026 and 73.3% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights71.6%
Oct–Dec 202586 flights70.0%
Jan–Mar 202690 flights72.0%
Apr–Jun 202647 flights73.3%

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, YX 4573 did best on Friday at 81.8% on time and worst on Sunday at 56.8%. Each day rests on about 45 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 4573 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 5,393 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
58%
National Airspace System
24%
Carrier
18%
Extreme weather
0%

58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,393 reported delay minutes here, that single category outweighs weather by 58 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,393 delay minutes reported on YX 4573.

Cancellations run at 8.57%, against 1.81% nationally. That is about one flight in twelve 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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: 8.57% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures