Flight number record

YX 3594

Republic Airways · Louisville to Newark

Route: SDF → EWR
Departs: 06:15
Flights: 343
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 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 13 points better than the US average of 77.3%. That gap is worth roughly 125 fewer late arrivals for every thousand flights.

On time

89.8%

Arrivals under 15 minutes late, of 324 completed flights

Avg delay

45 min

Across delayed arrivals only, not all flights

Cancelled

4.96%

National rate is 1.89%

1 hour+ late

2.8%

National rate is 8.3%

These figures cover 343 flights between September 2025 and August 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.

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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 95 of 343 flights, with 06:00 (72 flights) and 06:30 (52 flights) next.

Departs 06:1595 flights27.7%
Departs 06:0072 flights21.0%
Departs 06:3052 flights15.2%

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 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 89.8%. 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 3594 next to SDF to EWR

Every carrier on SDF to EWR combined arrived on time 87.4% of the time across 1,019 flights, so YX 3594 is 2 points ahead of it. Republic flew 1,015 flights on the same city pair under all its flight numbers, including this one, and those ran 87.5% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 12 points.

YX 3594 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 3594thin sample	343	89.8%	45 min	4.96%	A−
All Republic Airways on SDF–EWR	1,015	87.5%	66 min	4.73%	A−
All carriers on SDF–EWR	1,019	87.4%	66 min	4.71%	A−
Republic Airways, whole network	364,452	78.1%	74 min	4.55%	B−

Across the year

YX 3594 quarter by quarter

YX 3594 did not run the same all year. Its best quarter was Jul–Sep 2026 at 96.4% on time and its weakest Jan–Mar 2026 at 82.9%, a swing of 14 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 202530 flights—
Oct–Dec 202577 flights84.9%
Jan–Mar 202683 flights82.9%
Apr–Jun 202691 flights92.2%
Jul–Sep 202662 flights96.4%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, YX 3594 did best on Wednesday at 97.9% on time and worst on Monday at 80.0%. Each day rests on about 49 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late YX 3594 runs when it is late

YX 3594 often beats the schedule: 152 of 324 completed flights, 47%, arrived 15 minutes or more early. The 33 late arrivals split 13 under half an hour, 11 between 30 and 60 minutes, and 9 an hour or more.

15+ min early152 flights46.9%
Within 15 min139 flights42.9%
15–29 min late13 flights4.0%
30–59 min late11 flights3.4%
1–2 hours late8 flights2.5%
2+ hours late1 flights0.3%

Scale runs 0% to 100%.

Share of 324 completed flights by arrival against schedule.

A late pushback is often recovered here: of 20 departures that left 15 minutes late or more, 6 still arrived on time. In the other direction, 19 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 EWR.

The worst days

Worst days for YX 3594

The latest arrival of the period was on 14 March 2026, 2 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of YX 3594 in the period
Date	Arrived late by	Largest filed cause
14 March 2026	2 hours 15 minutes	Carrier
7 April 2026	1 hour 55 minutes	Carrier
18 June 2026	1 hour 39 minutes	Extreme weather
27 March 2026	1 hour 26 minutes	Carrier
1 December 2025	1 hour 15 minutes	Carrier

Delay causes

Why YX 3594 runs late

National Airspace System accounts for 44% of the 1,478 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
44%
Carrier
43%
Extreme weather
14%

Extreme weather accounts for 14% 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 2.3 times the usual weather exposure. The split is drawn from 1,478 delay minutes reported on YX 3594.

Cancellations run at 4.96%, against 1.89% nationally. That is about one flight in twenty 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 2.8% 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 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.

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: 4.96% of its 343 scheduled flights did not operate. A late arrival costs about 45 minutes, 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures