Flight number record
YX 5594
Republic Airways · Boston to Memphis
- Route
- BOS → MEM
- Departs
- 21:15
- Flights
- 292
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 292 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so YX 5594 runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
67.1%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
4.79%
National rate is 1.81%
1 hour+ late
13.4%
National rate is 8.1%
These figures cover 292 flights between July 2025 and June 2026. Beyond the headline rate, 13.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 96 of 292 flights, with 21:10 (38 flights) and 20:40 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 21:1596 flights32.9%
- Departs 21:1038 flights13.0%
- Departs 20:4030 flights10.3%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and YX 5594 runs 3 points worse at 67.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
YX 5594 next to BOS to MEM
Across its whole network Republic Airways managed 78.5%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5594thin sample | 292 | 67.1% | 63 min | 4.79% | C− |
| All Republic Airways on BOS–MEMthin sample | 292 | 67.1% | 63 min | 4.79% | C− |
| All carriers on BOS–MEMthin sample | 292 | 67.1% | 63 min | 4.79% | C− |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 5594 quarter by quarter
Quarter by quarter YX 5594 held fairly steady: 61.9% in Jul–Sep 2025, 70.4% in Oct–Dec 2025 and 65.2% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202589 flights61.9%
- Oct–Dec 202586 flights70.4%
- Jan–Mar 202626 flights—
- Apr–Jun 202691 flights65.2%
Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5594 did best on Saturday at 86.0% on time and worst on Thursday at 60.0%. Each day rests on about 42 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Delay causes
Why YX 5594 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 5,749 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.
- 49%Late-arriving aircraft
- 28%Carrier
- 23%National Airspace System
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,749 reported delay minutes here, that single category outweighs weather by 49 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,749 delay minutes reported on YX 5594.
Cancellations run at 4.79%, against 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 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 BOS to ORD (18), ORD to BOS (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. 292 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: 4.79% of its 292 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.