Flight number record
DL 1104
Delta Air Lines · Atlanta to Dallas
- Route
- ATL → DAL
- Departs
- 21:15
- Flights
- 335
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1104, check with Delta Air Lines.
DL 1104 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 a little over an hour on average. That rests on 335 flights, with a median arrival 10 minutes early.
Key figures
On time
81.2%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
2.69%
National rate is 1.89%
1 hour+ late
9.2%
National rate is 8.3%
These figures cover 335 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 1104 flies
DL 1104 flies ATL to DAL without a single fixed slot. Its most common scheduled departure was 21:15, used on 159 of 335 flights, with 22:40 (65 flights) and 21:24 (36 flights) next.
- Departs 21:15159 flights47.5%
- Departs 22:4065 flights19.4%
- Departs 21:2436 flights10.7%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1104 runs 11 points better at 81.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 1104 next to ATL to DAL
Every carrier on ATL to DAL combined arrived on time 80.4% of the time across 3,297 flights, so DL 1104 is about level with it. Delta flew 1,799 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. 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 1104thin sample | 335 | 81.2% | 79 min | 2.69% | B |
| All Delta Air Lines on ATL–DAL | 1,799 | 83.6% | 65 min | 2.00% | B |
| All carriers on ATL–DAL | 3,297 | 80.4% | 61 min | 1.85% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1104 quarter by quarter
DL 1104 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 59.4%, a swing of 34 points on roughly 67 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 202591 flights80.2%
- Jan–Mar 202690 flights82.4%
- Apr–Jun 202691 flights85.1%
- Jul–Sep 202633 flights59.4%
Scale runs 50% to 100%.
By weekday, DL 1104 did best on Wednesday at 93.6% on time and worst on Monday at 72.9%. Each day rests on about 48 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1104 runs when it is late
DL 1104 often beats the schedule: 118 of 325 completed flights, 36%, arrived 15 minutes or more early. The 61 late arrivals split 14 under half an hour, 17 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early118 flights36.3%
- Within 15 min146 flights44.9%
- 15–29 min late14 flights4.3%
- 30–59 min late17 flights5.2%
- 1–2 hours late23 flights7.1%
- 2+ hours late7 flights2.2%
Scale runs 0% to 100%.
Share of 325 completed flights by arrival against schedule.
13 of 69 late departures made up the time and arrived on time, 19% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for DL 1104
The latest arrival of the period was on 24 October 2025, 10 hours behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 October 2025 | 10 hours | Carrier |
| 4 October 2025 | 9 hours 23 minutes | Carrier |
| 14 June 2026 | 3 hours 50 minutes | Late-arriving aircraft |
| 6 May 2026 | 2 hours 45 minutes | Late-arriving aircraft |
| 9 March 2026 | 2 hours 10 minutes | Late-arriving aircraft |
Delay causes
Why DL 1104 runs late
Carrier accounts for 62% of the 4,805 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 29%Late-arriving aircraft
- 9%National Airspace System
- 0%Extreme weather
The largest share of delay minutes, 62%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,972 of the 4,805 delay minutes reported here. The split is drawn from 4,805 delay minutes reported on DL 1104.
Cancellations run at 2.69%, against 1.89% nationally. That is about 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
9.2% 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 721 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 ATL to BOS (4), but none flew often enough under DL 1104 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to DAL only.
One caution: this is a thin sample. 335 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 1104
For a booking, the cancellation rate is the figure to plan around on DL 1104: 2.69% of its 335 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 DAL, every carrier and departure
- DAL to ATL, the return direction
- Delta Air Lines 512 on the same route84.3%
- Delta Air Lines 2780 on the same route76.5%
- Delta Air Lines 1115 on the same route90.2%
- Delta Air Lines 441 on the same route90.2%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Dallas Love Field (DAL) 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.