Flight number record
YX 4531
Republic Airways · Pittsburgh to Raleigh
- Route
- PIT → RDU
- Departs
- 08:00
- Flights
- 250
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4531, 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 4531 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 40 minutes. That rests on 250 flights, with a median arrival 12 minutes early.
Set against the rest of the country, YX 4531's record is 16 points better than the US average of 77.3%. That gap is worth roughly 159 fewer late arrivals for every thousand flights.
Key figures
On time
93.2%
Arrivals under 15 minutes late, of 250 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
0.8%
National rate is 8.3%
These figures cover 250 flights between September 2025 and August 2026. The median arrival is 12 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 4531 flies
YX 4531 flies PIT to RDU without a single fixed slot. Its most common scheduled departure was 08:00, used on 72 of 250 flights, with 06:00 (55 flights) and 07:01 (32 flights) next.
- Departs 08:0072 flights28.8%
- Departs 06:0055 flights22.0%
- Departs 07:0132 flights12.8%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and YX 4531 runs 9 points better at 93.2%. 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 4531 next to PIT to RDU
Every carrier on PIT to RDU combined arrived on time 85.5% of the time across 725 flights, so YX 4531 is 8 points ahead of it. Republic flew 688 flights on the same city pair under all its flight numbers, including this one, and those ran 85.2% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4531thin sample | 250 | 93.2% | 39 min | 0.00% | A+ |
| All Republic Airways on PIT–RDU | 688 | 85.2% | 60 min | 0.87% | A+ |
| All carriers on PIT–RDU | 725 | 85.5% | 60 min | 1.24% | A |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4531 quarter by quarter
Quarter by quarter YX 4531 held fairly steady: 100.0% in Jul–Sep 2025, 92.0% in Oct–Dec 2025, 95.1% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202588 flights92.0%
- Jan–Mar 202629 flights—
- Apr–Jun 202641 flights95.1%
- Jul–Sep 202662 flights95.2%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4531 did best on Thursday at 97.2% on time and worst on Sunday at 83.3%. Each day rests on about 36 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 4531 runs when it is late
YX 4531 often beats the schedule: 100 of 250 completed flights, 40%, arrived 15 minutes or more early. The 17 late arrivals split 7 under half an hour, 8 between 30 and 60 minutes, and 2 an hour or more. Not one arrived two hours late.
- 15+ min early100 flights40.0%
- Within 15 min133 flights53.2%
- 15–29 min late7 flights2.8%
- 30–59 min late8 flights3.2%
- 1–2 hours late2 flights0.8%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 250 completed flights by arrival against schedule.
Only 10 of 250 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for YX 4531
The latest arrival of the period was on 7 March 2026, 1 hour 49 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across March, December, August and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 1 hour 49 minutes | Late-arriving aircraft |
| 15 December 2025 | 1 hour 22 minutes | Carrier |
| 2 August 2026 | 50 minutes | Carrier |
| 2 December 2025 | 47 minutes | National Airspace System |
| 22 February 2026 | 47 minutes | National Airspace System |
Delay causes
Why YX 4531 runs late
National Airspace System accounts for 43% of the 670 delay minutes carriers reported here, and the remaining four split what is left.
- 43%National Airspace System
- 32%Carrier
- 18%Late-arriving aircraft
- 4%Security
- 3%Extreme weather
43% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 289 minutes out of 670, against a national NAS share of 21%. The split is drawn from 670 delay minutes reported on YX 4531.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 0.8% 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 two other city pairs in the data, including BTV to DCA (37) and MSP to ORD (30), but none flew often enough under YX 4531 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PIT to RDU only.
One caution: this is a thin sample. 250 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 4531
For a booking, YX 4531 has one of the better records a US domestic flight can show: 93.2% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- PIT to RDU, every carrier and departure
- RDU to PIT, the return direction
- Pittsburgh International (PIT) delay statistics
- Raleigh-Durham International (RDU) 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
- Worst months to fly in the US, ranked by the data
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.