Flight number record
DL 2599
Delta Air Lines · Atlanta to Madison
- Route
- ATL → MSN
- Departs
- 15:15
- Flights
- 321
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2599, check with Delta Air Lines.
DL 2599 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 321 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 2599's record is 6 points better than the US average of 77.3%. That gap is worth roughly 57 fewer late arrivals for every thousand flights.
Key figures
On time
83.0%
Arrivals under 15 minutes late, of 312 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
2.80%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 321 flights between September 2025 and August 2026. The median arrival is 7 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 2599 flies
DL 2599 flies ATL to MSN without a single fixed slot. Its most common scheduled departure was 15:15, used on 94 of 321 flights, with 15:25 (74 flights) next.
- Departs 15:1594 flights29.3%
- Departs 15:2574 flights23.1%
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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2599 runs 11 points better at 83.0%. 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 2599 next to ATL to MSN
Every carrier on ATL to MSN combined arrived on time 83.5% of the time across 1,029 flights, so DL 2599 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2599thin sample | 321 | 83.0% | 50 min | 2.80% | B |
| All Delta Air Lines on ATL–MSN | 1,029 | 83.5% | 56 min | 2.14% | B |
| All carriers on ATL–MSN | 1,029 | 83.5% | 56 min | 2.14% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2599 quarter by quarter
DL 2599 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 73.1%, a swing of 20 points on roughly 64 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 202568 flights84.6%
- Jan–Mar 202686 flights82.1%
- Apr–Jun 202684 flights85.2%
- Jul–Sep 202653 flights73.1%
Scale runs 65% to 100%.
By weekday, DL 2599 did best on Wednesday at 94.0% on time and worst on Friday at 73.9%. Each day rests on about 46 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2599 runs when it is late
The 53 late arrivals split 17 under half an hour, 22 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early64 flights20.5%
- Within 15 min195 flights62.5%
- 15–29 min late17 flights5.4%
- 30–59 min late22 flights7.1%
- 1–2 hours late11 flights3.5%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 312 completed flights by arrival against schedule.
6 of 50 late departures made up the time and arrived on time, 12% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 2599
The latest arrival of the period was on 1 December 2025, 3 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, August, July, May and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 December 2025 | 3 hours 2 minutes | Carrier |
| 5 August 2026 | 2 hours 13 minutes | Carrier |
| 24 July 2026 | 2 hours 9 minutes | Extreme weather |
| 26 May 2026 | 1 hour 59 minutes | Late-arriving aircraft |
| 25 November 2025 | 1 hour 38 minutes | Late-arriving aircraft |
Delay causes
Why DL 2599 runs late
Carrier accounts for 55% of the 2,640 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 21%Late-arriving aircraft
- 18%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,457 of the 2,640 delay minutes reported here. The split is drawn from 2,640 delay minutes reported on DL 2599.
Cancellations run at 2.80%, against 1.89% nationally. That is roughly one flight in 40 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
Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.3% 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 707 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 2599 is not only a ATL to MSN flight. It also flew MSN to ATL (315 flights, 84.6% 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. 321 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 |
|---|---|---|---|---|---|
| MSN to ATLthin sample | 315 | 84.6% | 66 min | 2.86% | B |
What to do with this
Booking DL 2599
For a booking, the cancellation rate is the figure to plan around on DL 2599: 2.80% of its 321 scheduled flights did not operate. A late arrival costs about 50 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to MSN, every carrier and departure
- MSN to ATL, the return direction
- Delta Air Lines 2144 on the same route81.4%
- Delta Air Lines 2681 on the same route86.0%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.