Flight number record
YX 4578
Republic Airways · Greensboro to New York
- Route
- GSO → LGA
- Departs
- 06:00
- Flights
- 323
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4578, 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 4578 earns an A−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 323 flights, with a median arrival 10 minutes early.
Set against the rest of the country, YX 4578's record is 9 points better than the US average of 77.3%. That gap is worth roughly 88 fewer late arrivals for every thousand flights.
Key figures
On time
86.1%
Arrivals under 15 minutes late, of 302 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
6.50%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 323 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When YX 4578 flies
YX 4578 flies GSO to LGA without a single fixed slot. Its most common scheduled departure was 06:00, used on 178 of 323 flights, with 06:05 (70 flights) next.
- Departs 06:00178 flights55.1%
- Departs 06:0570 flights21.7%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 4578 runs 3 points worse at 86.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
YX 4578 next to GSO to LGA
Every carrier on GSO to LGA combined arrived on time 76.0% of the time across 1,737 flights, so YX 4578 is 10 points ahead of it. Republic flew 1,735 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4578thin sample | 323 | 86.1% | 73 min | 6.50% | A− |
| All Republic Airways on GSO–LGA | 1,735 | 75.9% | 82 min | 6.51% | B− |
| All carriers on GSO–LGA | 1,737 | 76.0% | 82 min | 6.51% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4578 quarter by quarter
Quarter by quarter YX 4578 held fairly steady: 83.8% in Oct–Dec 2025, 83.8% in Jan–Mar 2026, 87.6% in Apr–Jun 2026 and 86.0% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202522 flights—
- Oct–Dec 202576 flights83.8%
- Jan–Mar 202680 flights83.8%
- Apr–Jun 202690 flights87.6%
- Jul–Sep 202655 flights86.0%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4578 ranged from 79.5% on Saturday to 91.1% on Tuesday. With about 46 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late YX 4578 runs when it is late
YX 4578 often beats the schedule: 103 of 302 completed flights, 34%, arrived 15 minutes or more early. The 42 late arrivals split 17 under half an hour, 14 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early103 flights34.1%
- Within 15 min157 flights52.0%
- 15–29 min late17 flights5.6%
- 30–59 min late14 flights4.6%
- 1–2 hours late3 flights1.0%
- 2+ hours late8 flights2.6%
Scale runs 0% to 100%.
Share of 302 completed flights by arrival against schedule.
3 of 23 late departures made up the time and arrived on time, 13% of them. In the other direction, 22 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 LGA.
The worst days
Worst days for YX 4578
The latest arrival of the period was on 30 April 2026, 6 hours 41 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across April, October, January and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 April 2026 | 6 hours 41 minutes | Late-arriving aircraft |
| 6 October 2025 | 6 hours 26 minutes | Late-arriving aircraft |
| 31 January 2026 | 4 hours 33 minutes | Extreme weather |
| 31 October 2025 | 4 hours 19 minutes | Carrier |
| 29 December 2025 | 3 hours 22 minutes | Carrier |
Delay causes
Why YX 4578 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,082 reported delay minutes.
- 40%Carrier
- 28%National Airspace System
- 24%Late-arriving aircraft
- 7%Extreme weather
- 1%Security
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,230 of the 3,082 delay minutes reported here. The split is drawn from 3,082 delay minutes reported on YX 4578.
Cancellations run at 6.50%, against 1.89% nationally. That is about one flight in fifteen 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
Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on one other city pair in the data, including ORD to IND (2), but none flew often enough under YX 4578 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GSO to LGA only.
One caution: this is a thin sample. 323 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 4578
For a booking, the cancellation rate is the figure to plan around on YX 4578: 6.50% of its 323 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- GSO to LGA, every carrier and departure
- LGA to GSO, 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
- What a cancellation rate actually tells you (and what it hides)
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.