Flight number record
YX 4579
Republic Airways · New York to Pittsburgh
- Route
- LGA → PIT
- Departs
- 13:10
- Flights
- 290
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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−, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 290 flights, with a median arrival 8 minutes early.
Key figures
On time
80.0%
Arrivals under 15 minutes late, of 280 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
3.45%
National rate is 1.89%
1 hour+ late
7.1%
National rate is 8.3%
These figures cover 290 flights between September 2025 and August 2026. The median arrival is 8 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 4579 flies
YX 4579 flies LGA to PIT without a single fixed slot. Its most common scheduled departure was 13:10, used on 45 of 290 flights, with 13:00 (37 flights) and 10:00 (32 flights) next.
- Departs 13:1045 flights15.5%
- Departs 13:0037 flights12.8%
- Departs 10:0032 flights11.0%
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 13:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and YX 4579 runs level with that at 80.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
YX 4579 next to LGA to PIT
Every carrier on LGA to PIT combined arrived on time 78.3% of the time across 3,013 flights, so YX 4579 is 2 points ahead of it. Republic flew 2,915 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4579thin sample | 290 | 80.0% | 71 min | 3.45% | B− |
| All Republic Airways on LGA–PIT | 2,915 | 78.6% | 80 min | 5.66% | B− |
| All carriers on LGA–PIT | 3,013 | 78.3% | 80 min | 5.48% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | 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 86.7% on time and its weakest Oct–Dec 2025 at 76.0%, a swing of 11 points on roughly 58 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 202530 flights86.7%
- Oct–Dec 202575 flights76.0%
- Jan–Mar 202683 flights81.6%
- Apr–Jun 202646 flights80.4%
- Jul–Sep 202656 flights79.2%
Scale runs 70% to 90%.
By weekday, YX 4579 did best on Friday at 93.2% on time and worst on Saturday at 65.6%. Each day rests on about 41 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 4579 runs when it is late
YX 4579 often beats the schedule: 95 of 280 completed flights, 34%, arrived 15 minutes or more early. The 56 late arrivals split 16 under half an hour, 20 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early95 flights33.9%
- Within 15 min129 flights46.1%
- 15–29 min late16 flights5.7%
- 30–59 min late20 flights7.1%
- 1–2 hours late11 flights3.9%
- 2+ hours late9 flights3.2%
Scale runs 0% to 100%.
Share of 280 completed flights by arrival against schedule.
8 of 50 late departures made up the time and arrived on time, 16% of them. In the other direction, 14 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 PIT.
The worst days
Worst days for YX 4579
The latest arrival of the period was on 11 August 2026, 9 hours 30 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 |
|---|---|---|
| 11 August 2026 | 9 hours 30 minutes | Late-arriving aircraft |
| 5 April 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 13 September 2025 | 3 hours 14 minutes | Late-arriving aircraft |
| 25 February 2026 | 3 hours 10 minutes | Carrier |
| 27 August 2026 | 2 hours 22 minutes | Carrier |
Delay causes
Why YX 4579 runs late
Late-arriving aircraft accounts for 56% of the 3,956 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Late-arriving aircraft
- 23%Carrier
- 20%National Airspace System
- 1%Extreme weather
56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,956 reported delay minutes here, that single category outweighs weather by 56 to one. The split is drawn from 3,956 delay minutes reported on YX 4579.
Cancellations run at 3.45%, against 1.89% nationally. That is about one flight in 30 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
7.1% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The same number turns up on four other city pairs in the data, including ATL to LGA (44), LGA to ATL (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. 290 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, the cancellation rate is the figure to plan around on YX 4579: 3.45% of its 290 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
- LGA to PIT, every carrier and departure
- PIT to LGA, the return direction
- Republic Airways 4410 on the same route66.9%
- Republic Airways 5722 on the same route67.7%
- LaGuardia (LGA) delay statistics
- Pittsburgh International (PIT) 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.