Flight number record
YX 4564
Republic Airways · Memphis to New York
- Route
- MEM → LGA
- Departs
- 06:00
- Flights
- 321
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s YX 4564, 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 4564 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 321 flights, with a median arrival 13 minutes early.
Set against the rest of the country, YX 4564's record is 11 points better than the US average of 77.6%. That gap is worth roughly 114 fewer late arrivals for every thousand flights.
Key figures
On time
89.0%
Arrivals under 15 minutes late, of 308 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
4.05%
National rate is 1.81%
1 hour+ late
4.5%
National rate is 8.1%
These figures cover 321 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 4564 flies
YX 4564 flies MEM to LGA without a single fixed slot. Its most common scheduled departure was 06:00, used on 157 of 321 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 06:00157 flights48.9%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 4564 runs level with that at 89.0%. 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 4564 next to MEM to LGA
Every carrier on MEM to LGA combined arrived on time 79.4% of the time across 1,033 flights, so YX 4564 is 10 points ahead of it. 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 4564thin sample | 321 | 89.0% | 101 min | 4.05% | A− |
| All Republic Airways on MEM–LGA | 1,033 | 79.4% | 84 min | 4.07% | B− |
| All carriers on MEM–LGA | 1,033 | 79.4% | 84 min | 4.07% | B− |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 4564 quarter by quarter
YX 4564 did not run the same all year. Its best quarter was Apr–Jun 2026 at 97.4% on time and its weakest Jan–Mar 2026 at 78.7%, a swing of 19 points on roughly 80 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 flights92.2%
- Oct–Dec 202582 flights85.2%
- Jan–Mar 202670 flights78.7%
- Apr–Jun 202677 flights97.4%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4564 ranged from 87.2% on Monday to 91.5% on Thursday. With about 46 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why YX 4564 runs late
One category carries most of the weight here. Carrier accounts for 60% of the 3,448 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.
- 60%Carrier
- 16%National Airspace System
- 14%Late-arriving aircraft
- 9%Extreme weather
- 0%Security
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,078 of the 3,448 delay minutes reported here. The split is drawn from 3,448 delay minutes reported on YX 4564.
Cancellations run at 4.05%, 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 4.5% 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 963 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.
Every one of the 321 flights under YX 4564 in the data flew MEM to LGA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 321 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 4564
For a booking, the cancellation rate is the figure to plan around on YX 4564: 4.05% of its 321 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- MEM to LGA, every carrier and departure
- LGA to MEM, the return direction
- Republic Airways 4807 on the same route64.9%
- LaGuardia (LGA) 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.