Flight number record
YX 4577
Republic Airways · New York to Greensboro
- Route
- LGA → GSO
- Departs
- 20:55
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, 8 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 307 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so YX 4577 runs 8 points behind the country as a whole. Across a thousand flights that is about 78 extra late arrivals.
Key figures
On time
69.5%
Arrivals under 15 minutes late, of 272 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
11.40%
National rate is 1.89%
1 hour+ late
19.1%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. Beyond the headline rate, 19.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 307 flights, with 20:59 (42 flights) and 21:29 (39 flights) next.
- Departs 20:5546 flights15.0%
- Departs 20:5942 flights13.7%
- Departs 21:2939 flights12.7%
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 20:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and YX 4577 runs level with that at 69.5%. 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 4577 next to LGA to GSO
Every carrier on LGA to GSO combined arrived on time 74.6% of the time across 1,735 flights, so YX 4577 is 5 points behind it. Republic flew 1,733 flights on the same city pair under all its flight numbers, including this one, and those ran 74.6% on time. Across its whole network Republic Airways managed 78.1%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4577thin sample | 307 | 69.5% | 84 min | 11.40% | C− |
| All Republic Airways on LGA–GSO | 1,733 | 74.6% | 67 min | 5.89% | C− |
| All carriers on LGA–GSO | 1,735 | 74.6% | 67 min | 5.88% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4577 quarter by quarter
YX 4577 did not run the same all year. Its best quarter was Apr–Jun 2026 at 72.2% on time and its weakest Jul–Sep 2026 at 61.9%, a swing of 10 points on roughly 77 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 202526 flights—
- Oct–Dec 202575 flights63.8%
- Jan–Mar 202676 flights71.9%
- Apr–Jun 202677 flights72.2%
- Jul–Sep 202653 flights61.9%
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4577 did best on Wednesday at 76.1% on time and worst on Sunday at 61.4%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 4577 runs when it is late
YX 4577 often beats the schedule: 103 of 272 completed flights, 38%, arrived 15 minutes or more early. When YX 4577 is late it tends to be very late: 52 of its 83 late arrivals were an hour or more behind, and 20 were two hours or more.
- 15+ min early103 flights37.9%
- Within 15 min86 flights31.6%
- 15–29 min late15 flights5.5%
- 30–59 min late16 flights5.9%
- 1–2 hours late32 flights11.8%
- 2+ hours late20 flights7.4%
Scale runs 0% to 100%.
Share of 272 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 74 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 17 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 GSO.
The worst days
Worst days for YX 4577
The latest arrival of the period was on 22 June 2026, 4 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 June 2026 | 4 hours 32 minutes | Late-arriving aircraft |
| 16 August 2026 | 3 hours 46 minutes | Late-arriving aircraft |
| 29 March 2026 | 3 hours 16 minutes | Late-arriving aircraft |
| 14 December 2025 | 3 hours 12 minutes | Extreme weather |
| 2 March 2026 | 2 hours 55 minutes | Carrier |
Delay causes
Why YX 4577 runs late
Late-arriving aircraft accounts for 72% of the 6,960 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Late-arriving aircraft
- 12%National Airspace System
- 11%Carrier
- 5%Extreme weather
72% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,960 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 6,960 delay minutes reported on YX 4577.
Cancellations run at 11.40%, against 1.89% nationally. That is about one flight in nine 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
19.1% 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 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. 307 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: 11.40% of its 307 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.
Related
Where to go next
- LGA to GSO, every carrier and departure
- GSO to LGA, the return direction
- LaGuardia (LGA) 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.