Flight number record
DL 1436
Delta Air Lines · Appleton to Atlanta
- Route
- ATW → ATL
- Departs
- 05:31
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1436, check with Delta Air Lines.
DL 1436 lands a B, 5 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 close to two hours on average. That rests on 364 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1436's record is 5 points better than the US average of 77.3%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.
Key figures
On time
82.0%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
117 min
Across delayed arrivals only, not all flights
Cancelled
2.20%
National rate is 1.89%
1 hour+ late
7.0%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 10 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 1436 flies
DL 1436 flies ATW to ATL without a single fixed slot. Its most common scheduled departure was 05:31, used on 100 of 364 flights, with 05:30 (59 flights) and 05:25 (40 flights) next.
- Departs 05:31100 flights27.5%
- Departs 05:3059 flights16.2%
- Departs 05:2540 flights11.0%
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 05:31 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1436 runs 7 points worse at 82.0%. 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 1436 next to ATW to ATL
Every carrier on ATW to ATL combined arrived on time 82.1% of the time across 366 flights, so DL 1436 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 1436thin sample | 364 | 82.0% | 117 min | 2.20% | B |
| All Delta Air Lines on ATW–ATL | 366 | 82.1% | 117 min | 2.19% | B |
| All carriers on ATW–ATL | 366 | 82.1% | 117 min | 2.19% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1436 quarter by quarter
DL 1436 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jan–Mar 2026 at 65.5%, a swing of 35 points on roughly 73 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 flights100.0%
- Oct–Dec 202591 flights75.6%
- Jan–Mar 202690 flights65.5%
- Apr–Jun 202691 flights90.1%
- Jul–Sep 202662 flights93.4%
Scale runs 55% to 100%.
By weekday, DL 1436 did best on Sunday at 87.8% on time and worst on Friday at 74.5%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1436 runs when it is late
DL 1436 often beats the schedule: 141 of 355 completed flights, 40%, arrived 15 minutes or more early. The 64 late arrivals split 17 under half an hour, 22 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early141 flights39.7%
- Within 15 min150 flights42.3%
- 15–29 min late17 flights4.8%
- 30–59 min late22 flights6.2%
- 1–2 hours late9 flights2.5%
- 2+ hours late16 flights4.5%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
7 of 46 late departures made up the time and arrived on time, 15% of them. In the other direction, 25 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 ATL.
The worst days
Worst days for DL 1436
The latest arrival of the period was on 15 June 2026, 11 hours 31 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 |
|---|---|---|
| 15 June 2026 | 11 hours 31 minutes | Carrier |
| 23 February 2026 | 10 hours 33 minutes | Carrier |
| 11 August 2026 | 7 hours 28 minutes | Carrier |
| 30 December 2025 | 7 hours 3 minutes | Carrier |
| 6 August 2026 | 6 hours 56 minutes | Extreme weather |
Delay causes
Why DL 1436 runs late
Carrier accounts for 59% of the 7,504 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 16%National Airspace System
- 16%Extreme weather
- 8%Late-arriving aircraft
Extreme weather accounts for 16% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.7 times the usual weather exposure. The split is drawn from 7,504 delay minutes reported on DL 1436.
Cancellations sit at 2.20% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
7.0% 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 close to two hours, which a normal layover absorbs.
The 765 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.
Every one of the 364 flights under DL 1436 in the data flew ATW to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 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 DL 1436
For a booking, read DL 1436 as 82.0% on time with 2.20% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.