Flight number record
DL 436
Delta Air Lines · Atlanta to Dallas-Fort Worth
- Route
- ATL → DFW
- Departs
- 17:35
- Flights
- 312
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 436, check with Delta Air Lines.
DL 436 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 312 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so DL 436 runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 298 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.53%
National rate is 1.89%
1 hour+ late
13.4%
National rate is 8.3%
These figures cover 312 flights between September 2025 and August 2026. Beyond the headline rate, 13.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 436 flies
DL 436 flies ATL to DFW without a single fixed slot. Its most common scheduled departure was 17:35, used on 45 of 312 flights, with 17:15 (36 flights) and 18:59 (34 flights) next.
- Departs 17:3545 flights14.4%
- Departs 17:1536 flights11.5%
- Departs 18:5934 flights10.9%
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 17:35 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 436 runs level with that at 66.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 436 next to ATL to DFW
Every carrier on ATL to DFW combined arrived on time 73.9% of the time across 6,672 flights, so DL 436 is 7 points behind it. Delta flew 2,784 flights on the same city pair under all its flight numbers, including this one, and those ran 76.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 436thin sample | 312 | 66.8% | 68 min | 3.53% | C− |
| All Delta Air Lines on ATL–DFW | 2,784 | 76.0% | 60 min | 2.55% | B |
| All carriers on ATL–DFW | 6,672 | 73.9% | 82 min | 2.50% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 436 quarter by quarter
DL 436 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 55.0%, a swing of 28 points on roughly 62 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 flights83.3%
- Oct–Dec 202587 flights65.9%
- Jan–Mar 202659 flights69.1%
- Apr–Jun 202675 flights69.0%
- Jul–Sep 202661 flights55.0%
Scale runs 45% to 90%.
By weekday, DL 436 did best on Thursday at 72.7% on time and worst on Tuesday at 59.5%. Each day rests on about 45 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 436 runs when it is late
The 99 late arrivals split 26 under half an hour, 33 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early46 flights15.4%
- Within 15 min153 flights51.3%
- 15–29 min late26 flights8.7%
- 30–59 min late33 flights11.1%
- 1–2 hours late29 flights9.7%
- 2+ hours late11 flights3.7%
Scale runs 0% to 100%.
Share of 298 completed flights by arrival against schedule.
21 of 98 late departures made up the time and arrived on time, 21% of them. In the other direction, 22 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 DFW.
The worst days
Worst days for DL 436
The latest arrival of the period was on 11 July 2026, 5 hours 57 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 |
|---|---|---|
| 11 July 2026 | 5 hours 57 minutes | Carrier |
| 11 August 2026 | 5 hours 20 minutes | Carrier |
| 17 July 2026 | 5 hours 7 minutes | Carrier |
| 25 May 2026 | 4 hours 15 minutes | National Airspace System |
| 7 December 2025 | 4 hours 2 minutes | Carrier |
Delay causes
Why DL 436 runs late
Carrier accounts for 44% of the 6,772 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 26%National Airspace System
- 23%Late-arriving aircraft
- 5%Extreme weather
- 0%Security
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,007 of the 6,772 delay minutes reported here. The split is drawn from 6,772 delay minutes reported on DL 436.
Cancellations run at 3.53%, against 1.89% nationally. That is about one flight in 30 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
13.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 731 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.
The same number turns up on one other city pair in the data, including DFW to ATL (204), but none flew often enough under DL 436 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to DFW only.
One caution: this is a thin sample. 312 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 436
For a booking, the cancellation rate is the figure to plan around on DL 436: 3.53% of its 312 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to DFW, every carrier and departure
- DFW to ATL, the return direction
- American Airlines 1567 on the same route86.4%
- Delta Air Lines 818 on the same route79.7%
- Delta Air Lines 921 on the same route76.1%
- Delta Air Lines 961 on the same route87.8%
- Delta Air Lines 839 on the same route79.8%
- Delta Air Lines 414 on the same route81.5%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Dallas/Fort Worth International (DFW) 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
- How often a connection fails at the major US hubs
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.