Flight number record
YX 5594
Republic Airways · Boston to Memphis
- Route
- BOS → MEM
- Departs
- 21:15
- Flights
- 295
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5594, 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 5594 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 295 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so YX 5594 runs 12 points behind the country as a whole. Across a thousand flights that is about 115 extra late arrivals.
Key figures
On time
65.8%
Arrivals under 15 minutes late, of 278 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
5.42%
National rate is 1.89%
1 hour+ late
13.3%
National rate is 8.3%
These figures cover 295 flights between September 2025 and August 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 5594 flies
YX 5594 flies BOS to MEM without a single fixed slot. Its most common scheduled departure was 21:15, used on 123 of 295 flights, with 21:10 (38 flights) next.
- Departs 21:15123 flights41.7%
- Departs 21:1038 flights12.9%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and YX 5594 runs 4 points worse at 65.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
YX 5594 next to BOS to MEM
Across its whole network Republic Airways managed 78.1%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5594thin sample | 295 | 65.8% | 62 min | 5.42% | C− |
| All Republic Airways on BOS–MEMthin sample | 295 | 65.8% | 62 min | 5.42% | C− |
| All carriers on BOS–MEMthin sample | 295 | 65.8% | 62 min | 5.42% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 5594 quarter by quarter
YX 5594 did not run the same all year. Its best quarter was Oct–Dec 2025 at 70.4% on time and its weakest Jul–Sep 2026 at 56.9%, a swing of 14 points on roughly 98 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 202586 flights70.4%
- Jan–Mar 202626 flights—
- Apr–Jun 202691 flights65.2%
- Jul–Sep 202662 flights56.9%
Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5594 did best on Saturday at 83.7% on time and worst on Thursday at 57.1%. Each day rests on about 42 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5594 runs when it is late
YX 5594 often beats the schedule: 88 of 278 completed flights, 32%, arrived 15 minutes or more early. The 95 late arrivals split 23 under half an hour, 35 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early88 flights31.7%
- Within 15 min95 flights34.2%
- 15–29 min late23 flights8.3%
- 30–59 min late35 flights12.6%
- 1–2 hours late28 flights10.1%
- 2+ hours late9 flights3.2%
Scale runs 0% to 100%.
Share of 278 completed flights by arrival against schedule.
15 of 98 late departures made up the time and arrived on time, 15% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for YX 5594
The latest arrival of the period was on 6 September 2025, 5 hours 22 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 September 2025 | 5 hours 22 minutes | National Airspace System |
| 19 May 2026 | 3 hours 26 minutes | Late-arriving aircraft |
| 29 December 2025 | 3 hours 23 minutes | Carrier |
| 18 June 2026 | 2 hours 40 minutes | Late-arriving aircraft |
| 7 August 2026 | 2 hours 37 minutes | Late-arriving aircraft |
Delay causes
Why YX 5594 runs late
Late-arriving aircraft accounts for 51% of the 5,879 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 30%Carrier
- 18%National Airspace System
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,879 reported delay minutes here, that single category outweighs weather by 51 to one. The split is drawn from 5,879 delay minutes reported on YX 5594.
Cancellations run at 5.42%, 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
13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,139 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 ORD to BOS (18), BOS to ORD (18) and JFK to MEM (4), but none flew often enough under YX 5594 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to MEM only.
One caution: this is a thin sample. 295 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 5594
For a booking, the cancellation rate is the figure to plan around on YX 5594: 5.42% of its 295 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- Boston Logan International (BOS) delay statistics
- Memphis International (MEM) 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
- Why the first flight of the morning is statistically safest
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.