Flight number record
DL 2535
Delta Air Lines · Detroit to West Palm Beach
- Route
- DTW → PBI
- Departs
- 08:40
- Flights
- 261
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2535, check with Delta Air Lines.
DL 2535 lands a B+, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 261 flights, with a median arrival 2 minutes early.
Key figures
On time
81.2%
Arrivals under 15 minutes late, of 260 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.38%
National rate is 1.89%
1 hour+ late
6.5%
National rate is 8.3%
These figures cover 261 flights between September 2025 and August 2026. The median arrival is 2 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 2535 flies
DL 2535 flies DTW to PBI without a single fixed slot. Its most common scheduled departure was 08:40, used on 66 of 261 flights, with 08:45 (36 flights) and 08:30 (34 flights) next.
- Departs 08:4066 flights25.3%
- Departs 08:4536 flights13.8%
- Departs 08:3034 flights13.0%
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 08:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 2535 runs 3 points worse at 81.2%. 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
DL 2535 next to DTW to PBI
Every carrier on DTW to PBI combined arrived on time 80.4% of the time across 444 flights, so DL 2535 is about level with it. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2535thin sample | 261 | 81.2% | 62 min | 0.38% | B+ |
| All Delta Air Lines on DTW–PBI | 444 | 80.4% | 59 min | 1.35% | B |
| All carriers on DTW–PBI | 444 | 80.4% | 59 min | 1.35% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2535 quarter by quarter
DL 2535 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 73.3%, a swing of 20 points on roughly 65 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 flights79.3%
- Jan–Mar 202690 flights73.3%
- Apr–Jun 202649 flights91.7%
Scale runs 65% to 100%.
By weekday, DL 2535 did best on Wednesday at 89.2% on time and worst on Monday at 71.1%. Each day rests on about 37 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2535 runs when it is late
The 49 late arrivals split 24 under half an hour, 8 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early42 flights16.2%
- Within 15 min169 flights65.0%
- 15–29 min late24 flights9.2%
- 30–59 min late8 flights3.1%
- 1–2 hours late10 flights3.8%
- 2+ hours late7 flights2.7%
Scale runs 0% to 100%.
Share of 260 completed flights by arrival against schedule.
7 of 29 late departures made up the time and arrived on time, 24% of them. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at PBI.
The worst days
Worst days for DL 2535
The latest arrival of the period was on 30 November 2025, 4 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 4 hours 46 minutes | Carrier |
| 1 November 2025 | 3 hours 30 minutes | Carrier |
| 16 March 2026 | 3 hours 26 minutes | National Airspace System |
| 20 April 2026 | 3 hours 17 minutes | Carrier |
| 5 December 2025 | 2 hours 36 minutes | Carrier |
Delay causes
Why DL 2535 runs late
Carrier accounts for 49% of the 3,050 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 47%National Airspace System
- 4%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,482 of the 3,050 delay minutes reported here. The split is drawn from 3,050 delay minutes reported on DL 2535.
Cancellations are rare at 0.38%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.5% 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 1,086 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 2535 is not only a DTW to PBI flight. It also flew PBI to DTW (261 flights, 77.7% 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. 261 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 DTWthin sample | 261 | 77.7% | 80 min | 0.38% | B+ |
What to do with this
Booking DL 2535
For a booking, read DL 2535 as 81.2% on time with 0.38% cancelled over 261 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Palm Beach International (PBI) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.