Flight number record
YX 4564
Republic Airways · Memphis to New York
- Route
- MEM → LGA
- Departs
- 06:00
- Flights
- 321
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. 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 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
4.67%
National rate is 1.89%
1 hour+ late
6.2%
National rate is 8.3%
These figures cover 321 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 4564 flies
YX 4564 flies MEM to LGA without a single fixed slot. Its most common scheduled departure was 06:00, used on 163 of 321 flights.
- Departs 06:00163 flights50.8%
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 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 3 points worse at 85.9%. 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 4564 next to MEM to LGA
Every carrier on MEM to LGA combined arrived on time 78.6% of the time across 1,096 flights, so YX 4564 is 7 points ahead of it. Across its whole network Republic Airways managed 78.1%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4564thin sample | 321 | 85.9% | 103 min | 4.67% | A− |
| All Republic Airways on MEM–LGA | 1,096 | 78.6% | 85 min | 5.29% | B− |
| All carriers on MEM–LGA | 1,096 | 78.6% | 85 min | 5.29% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | 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 64 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 202582 flights85.2%
- Jan–Mar 202670 flights78.7%
- Apr–Jun 202677 flights97.4%
- Jul–Sep 202662 flights78.9%
Scale runs 70% to 100%.
By weekday, YX 4564 ranged from 80.9% on Monday to 91.4% on Sunday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late YX 4564 runs when it is late
YX 4564 often beats the schedule: 138 of 305 completed flights, 45%, arrived 15 minutes or more early. The 43 late arrivals split 11 under half an hour, 13 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early138 flights45.2%
- Within 15 min124 flights40.7%
- 15–29 min late11 flights3.6%
- 30–59 min late13 flights4.3%
- 1–2 hours late7 flights2.3%
- 2+ hours late12 flights3.9%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
6 of 35 late departures made up the time and arrived on time, 17% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for YX 4564
The latest arrival of the period was on 12 June 2026, 8 hours 48 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 June 2026 | 8 hours 48 minutes | Late-arriving aircraft |
| 27 January 2026 | 5 hours 56 minutes | Carrier |
| 5 March 2026 | 5 hours 7 minutes | Carrier |
| 31 January 2026 | 4 hours 50 minutes | Carrier |
| 30 July 2026 | 4 hours 42 minutes | Carrier |
Delay causes
Why YX 4564 runs late
Carrier accounts for 65% of the 4,438 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 16%National Airspace System
- 12%Late-arriving aircraft
- 7%Extreme weather
- 0%Security
The largest share of delay minutes, 65%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,890 of the 4,438 delay minutes reported here. The split is drawn from 4,438 delay minutes reported on YX 4564.
Cancellations run at 4.67%, 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
6.2% 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 close to two hours, which a normal layover absorbs.
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.
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: 4.67% 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
- Memphis International (MEM) delay statistics
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.