Flight number record
DL 1527
Delta Air Lines · West Palm Beach to Atlanta
- Route
- PBI → ATL
- Departs
- 12:51
- Flights
- 334
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1527, check with Delta Air Lines.
DL 1527 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 334 flights, with a median arrival 6 minutes early.
Key figures
On time
77.1%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
1.80%
National rate is 1.89%
1 hour+ late
5.5%
National rate is 8.3%
These figures cover 334 flights between September 2025 and August 2026. The median arrival is 6 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 DL 1527 flies
DL 1527 flies PBI to ATL without a single fixed slot. Its most common scheduled departure was 12:51, used on 82 of 334 flights, with 12:45 (56 flights) and 13:00 (34 flights) next.
- Departs 12:5182 flights24.6%
- Departs 12:4556 flights16.8%
- Departs 13:0034 flights10.2%
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 12:51 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1527 runs level with that at 77.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1527 next to PBI to ATL
Every carrier on PBI to ATL combined arrived on time 82.7% of the time across 3,475 flights, so DL 1527 is 6 points behind it. Delta flew 3,402 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1527thin sample | 334 | 77.1% | 57 min | 1.80% | B |
| All Delta Air Lines on PBI–ATL | 3,402 | 83.6% | 64 min | 1.59% | B |
| All carriers on PBI–ATL | 3,475 | 82.7% | 67 min | 1.61% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1527 quarter by quarter
DL 1527 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 69.8%, a swing of 24 points on roughly 67 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 flights93.3%
- Oct–Dec 202592 flights81.3%
- Jan–Mar 202690 flights69.8%
- Apr–Jun 202691 flights76.7%
- Jul–Sep 202631 flights71.0%
Scale runs 60% to 100%.
By weekday, DL 1527 did best on Tuesday at 87.2% on time and worst on Thursday at 66.7%. Each day rests on about 48 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1527 runs when it is late
DL 1527 often beats the schedule: 89 of 328 completed flights, 27%, arrived 15 minutes or more early. The 75 late arrivals split 30 under half an hour, 27 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early89 flights27.1%
- Within 15 min164 flights50.0%
- 15–29 min late30 flights9.1%
- 30–59 min late27 flights8.2%
- 1–2 hours late11 flights3.4%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 328 completed flights by arrival against schedule.
16 of 76 late departures made up the time and arrived on time, 21% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 1527
The latest arrival of the period was on 12 July 2026, 6 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 July 2026 | 6 hours 32 minutes | Carrier |
| 17 June 2026 | 6 hours 17 minutes | Carrier |
| 1 April 2026 | 3 hours 15 minutes | Late-arriving aircraft |
| 24 January 2026 | 2 hours 38 minutes | Late-arriving aircraft |
| 2 July 2026 | 2 hours 34 minutes | Late-arriving aircraft |
Delay causes
Why DL 1527 runs late
Late-arriving aircraft accounts for 48% of the 4,235 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 29%Carrier
- 18%National Airspace System
- 3%Extreme weather
- 2%Security
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,235 reported delay minutes here, that single category outweighs weather by 17 to one. The split is drawn from 4,235 delay minutes reported on DL 1527.
Cancellations sit at 1.80% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.5% 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 about an hour, which a normal layover absorbs.
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.
DL 1527 is not only a PBI to ATL flight. It also flew ATL to PBI (334 flights, 82.7% 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. 334 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 |
|---|---|---|---|---|---|
| ATL to PBIthin sample | 334 | 82.7% | 50 min | 1.50% | B |
What to do with this
Booking DL 1527
For a booking, DL 1527 is one of the weaker ways to fly PBI to ATL: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- PBI to ATL, every carrier and departure
- ATL to PBI, the return direction
- Delta Air Lines 1301 on the same route91.0%
- Delta Air Lines 1311 on the same route86.2%
- Delta Air Lines 1352 on the same route92.9%
- Delta Air Lines 838 on the same route72.1%
- Delta Air Lines 1458 on the same route72.5%
- Delta Air Lines 1376 on the same route96.9%
- Palm Beach International (PBI) delay statistics
- 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
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.