Flight number record
DL 921
Delta Air Lines · Atlanta to Dallas-Fort Worth
- Route
- ATL → DFW
- Departs
- 13:59
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 921, check with Delta Air Lines.
DL 921 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 363 flights, with a median arrival 3 minutes early.
Key figures
On time
76.1%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
8.1%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 921 flies
DL 921 flies ATL to DFW without a single fixed slot. Its most common scheduled departure was 13:59, used on 81 of 363 flights, with 13:41 (64 flights) next.
- Departs 13:5981 flights22.3%
- Departs 13:4164 flights17.6%
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 13:59 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 921 runs 2 points worse at 76.1%. 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 921 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 921 is 2 points ahead of 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 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 921thin sample | 363 | 76.1% | 67 min | 0.83% | B+ |
| 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 921 quarter by quarter
DL 921 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Apr–Jun 2026 at 71.1%, a swing of 16 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 flights86.7%
- Oct–Dec 202591 flights76.9%
- Jan–Mar 202689 flights77.0%
- Apr–Jun 202691 flights71.1%
- Jul–Sep 202662 flights75.8%
Scale runs 65% to 90%.
By weekday, DL 921 did best on Thursday at 88.5% on time and worst on Sunday at 70.0%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 921 runs when it is late
The 86 late arrivals split 24 under half an hour, 33 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early63 flights17.5%
- Within 15 min211 flights58.6%
- 15–29 min late24 flights6.7%
- 30–59 min late33 flights9.2%
- 1–2 hours late21 flights5.8%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
17 of 82 late departures made up the time and arrived on time, 21% of them. In the other direction, 21 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 921
The latest arrival of the period was on 3 January 2026, 8 hours 36 minutes 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 national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 January 2026 | 8 hours 36 minutes | Carrier |
| 3 July 2026 | 5 hours 17 minutes | Carrier |
| 2 June 2026 | 5 hours 12 minutes | National Airspace System |
| 26 January 2026 | 4 hours 20 minutes | National Airspace System |
| 6 June 2026 | 3 hours 44 minutes | National Airspace System |
Delay causes
Why DL 921 runs late
Carrier accounts for 47% of the 5,797 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 35%National Airspace System
- 16%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,707 of the 5,797 delay minutes reported here. The split is drawn from 5,797 delay minutes reported on DL 921.
Cancellations are rare at 0.83%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
8.1% 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 about an hour, which a normal layover absorbs.
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 (4), but none flew often enough under DL 921 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. 363 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 921
For a booking, read DL 921 as 76.1% on time with 0.83% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
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 961 on the same route87.8%
- Delta Air Lines 839 on the same route79.8%
- Delta Air Lines 414 on the same route81.5%
- American Airlines 2770 on the same route89.6%
- 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
- The best time of day to fly, according to 7.05 million flight records
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.