Flight number record
YX 3594
Republic Airways · Louisville to Newark
- Route
- SDF → EWR
- Departs
- 06:15
- Flights
- 343
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s YX 3594, 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 3594 earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 343 flights, with a median arrival 13 minutes early.
Set against the rest of the country, YX 3594's record is 12 points better than the US average of 77.6%. That gap is worth roughly 117 fewer late arrivals for every thousand flights.
Key figures
On time
89.3%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
4.08%
National rate is 1.81%
1 hour+ late
3.7%
National rate is 8.1%
These figures cover 343 flights between July 2025 and June 2026. The median arrival is 13 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 3594 flies
YX 3594 flies SDF to EWR without a single fixed slot. Its most common scheduled departure was 06:15, used on 87 of 343 flights, with 06:00 (72 flights) and 06:30 (60 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 06:1587 flights25.4%
- Departs 06:0072 flights21.0%
- Departs 06:3060 flights17.5%
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 06:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 3594 runs level with that at 89.3%. 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 3594 next to SDF to EWR
Every carrier on SDF to EWR combined arrived on time 86.2% of the time across 973 flights, so YX 3594 is 3 points ahead of it. Republic flew 958 flights on the same city pair under all its flight numbers, including this one, and those ran 86.4% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 3594thin sample | 343 | 89.3% | 53 min | 4.08% | A− |
| All Republic Airways on SDF–EWR | 958 | 86.4% | 67 min | 3.76% | A− |
| All carriers on SDF–EWR | 973 | 86.2% | 67 min | 3.80% | A− |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 3594 quarter by quarter
YX 3594 did not run the same all year. Its best quarter was Jul–Sep 2025 at 95.5% on time and its weakest Jan–Mar 2026 at 82.9%, a swing of 13 points on roughly 86 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 flights95.5%
- Oct–Dec 202577 flights84.9%
- Jan–Mar 202683 flights82.9%
- Apr–Jun 202691 flights92.2%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, YX 3594 did best on Wednesday at 97.8% on time and worst on Monday at 80.4%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Delay causes
Why YX 3594 runs late
One category carries most of the weight here. National Airspace System accounts for 46% of the 1,842 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.
- 46%National Airspace System
- 43%Carrier
- 11%Extreme weather
Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure. The split is drawn from 1,842 delay minutes reported on YX 3594.
Cancellations run at 4.08%, against 1.81% nationally. That is about one flight in 25 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 3.7% 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 642 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on four other city pairs in the data, including EWR to ORF (45), EWR to CLE (15) and EWR to ATL (1), but none flew often enough under YX 3594 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SDF to EWR only.
One caution: this is a thin sample. 343 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 3594
For a booking, the cancellation rate is the figure to plan around on YX 3594: 4.08% of its 343 scheduled flights did not operate. A late arrival costs roughly 55 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SDF to EWR, every carrier and departure
- EWR to SDF, the return direction
- Newark Liberty International (EWR) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.