Flight number record
DL 1229
Delta Air Lines · Atlanta to Fort Lauderdale
- Route
- ATL → FLL
- Departs
- 22:40
- Flights
- 255
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1229, check with Delta Air Lines.
DL 1229 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 255 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so DL 1229 runs 11 points behind the country as a whole. Across a thousand flights that is about 114 extra late arrivals.
Key figures
On time
65.9%
Arrivals under 15 minutes late, of 249 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
2.35%
National rate is 1.89%
1 hour+ late
12.9%
National rate is 8.3%
These figures cover 255 flights between September 2025 and August 2026. Beyond the headline rate, 12.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1229 flies
DL 1229 flies ATL to FLL without a single fixed slot. Its most common scheduled departure was 22:40, used on 80 of 255 flights, with 22:50 (59 flights) and 22:45 (27 flights) next.
- Departs 22:4080 flights31.4%
- Departs 22:5059 flights23.1%
- Departs 22:4527 flights10.6%
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 22:40 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1229 runs 4 points worse at 65.9%. 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 1229 next to ATL to FLL
Every carrier on ATL to FLL combined arrived on time 70.7% of the time across 7,371 flights, so DL 1229 is 5 points behind it. Delta flew 4,383 flights on the same city pair under all its flight numbers, including this one, and those ran 73.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1229thin sample | 255 | 65.9% | 63 min | 2.35% | C |
| All Delta Air Lines on ATL–FLL | 4,383 | 73.9% | 57 min | 1.78% | C |
| All carriers on ATL–FLL | 7,371 | 70.7% | 66 min | 2.46% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1229 quarter by quarter
DL 1229 did not run the same all year. Its best quarter was Apr–Jun 2026 at 75.8% on time and its weakest Jul–Sep 2026 at 49.2%, a swing of 27 points on roughly 85 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.
- Oct–Dec 202512 flights—
- Jan–Mar 202690 flights69.4%
- Apr–Jun 202691 flights75.8%
- Jul–Sep 202662 flights49.2%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1229 did best on Tuesday at 82.9% on time and worst on Sunday at 51.4%. Each day rests on about 36 flights, so a gap of 32 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1229 runs when it is late
The 85 late arrivals split 27 under half an hour, 26 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early38 flights15.3%
- Within 15 min126 flights50.6%
- 15–29 min late27 flights10.8%
- 30–59 min late26 flights10.4%
- 1–2 hours late25 flights10.0%
- 2+ hours late7 flights2.8%
Scale runs 0% to 100%.
Share of 249 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 71 departures that left 15 minutes late or more, only 8 made it up before arrival. 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 FLL.
The worst days
Worst days for DL 1229
The latest arrival of the period was on 11 July 2026, 11 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 July 2026 | 11 hours 17 minutes | Carrier |
| 14 June 2026 | 2 hours 52 minutes | Carrier |
| 6 August 2026 | 2 hours 23 minutes | Carrier |
| 5 July 2026 | 2 hours 16 minutes | Carrier |
| 25 May 2026 | 2 hours 8 minutes | Carrier |
Delay causes
Why DL 1229 runs late
Carrier accounts for 55% of the 5,337 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 23%Late-arriving aircraft
- 21%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,947 of the 5,337 delay minutes reported here. The split is drawn from 5,337 delay minutes reported on DL 1229.
Cancellations sit at 2.35% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
12.9% 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 581 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 six other city pairs in the data, including DTW to RSW (74), RSW to DTW (63) and BOS to CVG (8), but none flew often enough under DL 1229 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to FLL only.
One caution: this is a thin sample. 255 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 1229
For a booking, DL 1229 is a flight to put a long connection behind. 12.9% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- ATL to FLL, every carrier and departure
- FLL to ATL, the return direction
- Delta Air Lines 1512 on the same route82.0%
- Delta Air Lines 1341 on the same route73.7%
- Delta Air Lines 1489 on the same route65.2%
- Delta Air Lines 2345 on the same route65.9%
- Delta Air Lines 1295 on the same route67.3%
- Delta Air Lines 1334 on the same route90.8%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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.