Flight number record
DL 1527
Delta Air Lines · Atlanta to West Palm Beach
- Route
- ATL → PBI
- Departs
- 09:56
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1527, check with Delta Air Lines.
DL 1527 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 3 minutes early.
Key figures
On time
80.0%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.81%
1 hour+ late
4.2%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 3 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 DL 1527 flies
DL 1527 flies ATL to PBI without a single fixed slot. Its most common scheduled departure was 09:56, used on 67 of 365 flights, with 09:40 (64 flights) and 09:50 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:5667 flights18.4%
- Departs 09:4064 flights17.5%
- Departs 09:5049 flights13.4%
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 09:56 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1527 runs 4 points worse at 80.0%. 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
DL 1527 next to ATL to PBI
Every carrier on ATL to PBI combined arrived on time 75.7% of the time across 3,826 flights, so DL 1527 is 4 points ahead of it. Delta flew 3,737 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1527 | 365 | 80.0% | 47 min | 1.37% | B |
| All Delta Air Lines on ATL–PBI | 3,737 | 76.3% | 52 min | 1.53% | B |
| All carriers on ATL–PBI | 3,826 | 75.7% | 54 min | 1.52% | B |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1527 quarter by quarter
DL 1527 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.8% on time and its weakest Jan–Mar 2026 at 70.1%, a swing of 17 points on roughly 91 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 flights77.2%
- Oct–Dec 202592 flights86.8%
- Jan–Mar 202690 flights70.1%
- Apr–Jun 202691 flights85.6%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1527 did best on Tuesday at 86.5% on time and worst on Saturday at 74.0%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1527 runs late
One category carries most of the weight here. Carrier accounts for 51% of the 3,364 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.
- 51%Carrier
- 34%National Airspace System
- 12%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 51%, 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 1,732 of the 3,364 delay minutes reported here. The split is drawn from 3,364 delay minutes reported on DL 1527.
Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.2% 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 545 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.
DL 1527 is not only a ATL to PBI flight. It also flew PBI to ATL (365 flights, 76.3% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 365 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PBI to ATL | 365 | 76.3% | 51 min | 1.64% | B |
What to do with this
Booking DL 1527
For a booking, read DL 1527 as 80.0% on time with 1.37% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to PBI, every carrier and departure
- PBI to ATL, the return direction
- Delta Air Lines 838 on the same route78.3%
- Delta Air Lines 959 on the same route72.5%
- Delta Air Lines 1606 on the same route69.1%
- Delta Air Lines 1311 on the same route89.0%
- Delta Air Lines 1458 on the same route75.6%
- Delta Air Lines 1495 on the same route73.2%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Delta Air Lines’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.