Flight number record

YX 4579

Republic Airways · New York to Pittsburgh

Route: LGA → PIT
Departs: 10:10
Flights: 296
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 4579, 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 4579 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 296 flights, with a median arrival 9 minutes early.

Set against the rest of the country, YX 4579's record is 4 points better than the US average of 77.6%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.

On time

81.7%

Arrivals under 15 minutes late, of 289 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

2.36%

National rate is 1.81%

1 hour+ late

5.9%

National rate is 8.1%

These figures cover 296 flights between July 2025 and June 2026. The median arrival is 9 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 4579 flies

YX 4579 flies LGA to PIT without a single fixed slot. Its most common scheduled departure was 10:10, used on 49 of 296 flights, with 13:10 (45 flights) and 13:00 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:1049 flights16.6%
Departs 13:1045 flights15.2%
Departs 13:0037 flights12.5%

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 10:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and YX 4579 runs 2 points worse at 81.7%. 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 4579 next to LGA to PIT

Every carrier on LGA to PIT combined arrived on time 79.0% of the time across 3,013 flights, so YX 4579 is 3 points ahead of it. Republic flew 2,863 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 3 points.

YX 4579 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4579thin sample	296	81.7%	59 min	2.36%	B
All Republic Airways on LGA–PIT	2,863	79.4%	75 min	4.54%	B−
All carriers on LGA–PIT	3,013	79.0%	75 min	4.45%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 4579 quarter by quarter

YX 4579 did not run the same all year. Its best quarter was Jul–Sep 2025 at 87.0% on time and its weakest Oct–Dec 2025 at 76.0%, a swing of 11 points on roughly 74 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 202592 flights87.0%
Oct–Dec 202575 flights76.0%
Jan–Mar 202683 flights81.6%
Apr–Jun 202646 flights80.4%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, YX 4579 did best on Friday at 90.9% on time and worst on Saturday at 67.6%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 4579 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 3,111 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
49%
Carrier
26%
National Airspace System
24%
Extreme weather
1%

49% 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 3,111 reported delay minutes here, that single category outweighs weather by 40 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 3,111 delay minutes reported on YX 4579.

Cancellations sit at 2.36% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on four other city pairs in the data, including LGA to ATL (44), ATL to LGA (44) and PIT to LGA (28), but none flew often enough under YX 4579 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to PIT only.

One caution: this is a thin sample. 296 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 4579

For a booking, read YX 4579 as 81.7% on time with 2.36% cancelled over 296 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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