Flight number record

YX 4577

Republic Airways · New York to Greensboro

Route: LGA → GSO
Departs: 20:55
Flights: 311
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 4577, 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 4577 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 an hour and a half behind schedule. That rests on 311 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.6%, so YX 4577 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 274 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

11.90%

National rate is 1.81%

1 hour+ late

18.2%

National rate is 8.1%

These figures cover 311 flights between July 2025 and June 2026. Beyond the headline rate, 18.2% 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 4577 flies

YX 4577 flies LGA to GSO without a single fixed slot. Its most common scheduled departure was 20:55, used on 46 of 311 flights, with 21:29 (38 flights) and 21:02 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:5546 flights14.8%
Departs 21:2938 flights12.2%
Departs 21:0232 flights10.3%

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 20:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and YX 4577 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 4577 next to LGA to GSO

Every carrier on LGA to GSO combined arrived on time 75.8% of the time across 1,807 flights, so YX 4577 is 4 points behind it. Republic flew 1,805 flights on the same city pair under all its flight numbers, including this one, and those ran 75.7% on time. Across its whole network Republic Airways managed 78.5%, which this flight trails by 7 points.

YX 4577 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4577thin sample	311	71.5%	84 min	11.90%	C−
All Republic Airways on LGA–GSO	1,805	75.7%	69 min	6.15%	B−
All carriers on LGA–GSO	1,807	75.8%	69 min	6.14%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 4577 quarter by quarter

YX 4577 did not run the same all year. Its best quarter was Jul–Sep 2025 at 78.3% on time and its weakest Oct–Dec 2025 at 63.8%, a swing of 15 points on roughly 78 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 202583 flights78.3%
Oct–Dec 202575 flights63.8%
Jan–Mar 202676 flights71.9%
Apr–Jun 202677 flights72.2%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, YX 4577 did best on Monday at 79.1% on time and worst on Sunday at 63.6%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 4577 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 74% of the 6,518 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
74%
Carrier
11%
National Airspace System
10%
Extreme weather
5%

74% 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 6,518 reported delay minutes here, that single category outweighs weather by 14 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 6,518 delay minutes reported on YX 4577.

Cancellations run at 11.90%, against 1.81% nationally. That is about one flight in eight 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. 18.2% 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 three other city pairs in the data, including ORD to CMH (2), CMH to ORD (2) and ORF to ORD (1), but none flew often enough under YX 4577 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to GSO only.

One caution: this is a thin sample. 311 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 4577

For a booking, the cancellation rate is the figure to plan around on YX 4577: 11.90% of its 311 scheduled flights did not operate. A late arrival costs an hour and a half, 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