Flight number record

YX 4578

Republic Airways · Greensboro to New York

Route: GSO → LGA
Departs: 06:00
Flights: 316
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 316 flights, with a median arrival 10 minutes early.

Set against the rest of the country, YX 4578's record is 8 points better than the US average of 77.6%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.

On time

85.4%

Arrivals under 15 minutes late, of 295 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

6.65%

National rate is 1.81%

1 hour+ late

4.4%

National rate is 8.1%

These figures cover 316 flights between July 2025 and June 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.

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 171 of 316 flights, with 06:05 (70 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:00171 flights54.1%
Departs 06:0570 flights22.2%

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 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 4 points worse at 85.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

YX 4578 next to GSO to LGA

Every carrier on GSO to LGA combined arrived on time 77.2% of the time across 1,809 flights, so YX 4578 is 8 points ahead of it. Republic flew 1,807 flights on the same city pair under all its flight numbers, including this one, and those ran 77.2% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 7 points.

YX 4578 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4578thin sample	316	85.4%	87 min	6.65%	A−
All Republic Airways on GSO–LGA	1,807	77.2%	80 min	6.47%	B−
All carriers on GSO–LGA	1,809	77.2%	80 min	6.47%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 4578 quarter by quarter

Quarter by quarter YX 4578 held fairly steady: 85.9% in Jul–Sep 2025, 83.8% in Oct–Dec 2025, 83.8% in Jan–Mar 2026 and 87.6% in Apr–Jun 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 202570 flights85.9%
Oct–Dec 202576 flights83.8%
Jan–Mar 202680 flights83.8%
Apr–Jun 202690 flights87.6%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, YX 4578 did best on Tuesday at 93.8% on time and worst on Saturday at 79.5%. Each day rests on about 45 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

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 3,752 reported delay minutes.

Carrier
40%
Late-arriving aircraft
34%
National Airspace System
20%
Extreme weather
6%
Security
1%

The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,482 of the 3,752 delay minutes reported here. The split is drawn from 3,752 delay minutes reported on YX 4578.

Cancellations run at 6.65%, against 1.81% 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 4.4% land an hour or more behind schedule, against 8.1% 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. 316 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: 6.65% of its 316 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