Flight number record
DL 2615
Delta Air Lines · Atlanta to Sioux Falls
- Route
- ATL → FSD
- Departs
- 21:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2615, check with Delta Air Lines.
DL 2615 lands a B+, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 365 flights, with a median arrival 4 minutes early.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 4 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 2615 flies
DL 2615 flies ATL to FSD without a single fixed slot. Its most common scheduled departure was 21:30, used on 94 of 365 flights, with 18:16 (57 flights) next.
- Departs 21:3094 flights25.8%
- Departs 18:1657 flights15.6%
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 21:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2615 runs 8 points better at 77.8%. 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 2615 next to ATL to FSD
Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2615 | 365 | 77.8% | 58 min | 0.82% | B+ |
| All Delta Air Lines on ATL–FSD | 365 | 77.8% | 58 min | 0.82% | B+ |
| All carriers on ATL–FSD | 365 | 77.8% | 58 min | 0.82% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2615 quarter by quarter
DL 2615 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.2% on time and its weakest Jul–Sep 2026 at 66.1%, 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 flights80.0%
- Oct–Dec 202592 flights81.1%
- Jan–Mar 202690 flights77.5%
- Apr–Jun 202691 flights82.2%
- Jul–Sep 202662 flights66.1%
Scale runs 60% to 90%.
By weekday, DL 2615 ranged from 74.5% on Saturday to 83.7% on Sunday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2615 runs when it is late
The 80 late arrivals split 32 under half an hour, 31 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early62 flights17.2%
- Within 15 min219 flights60.7%
- 15–29 min late32 flights8.9%
- 30–59 min late31 flights8.6%
- 1–2 hours late10 flights2.8%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 57 departures that left 15 minutes late or more, only 6 made it up before arrival. In the other direction, 29 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 FSD.
The worst days
Worst days for DL 2615
The latest arrival of the period was on 23 December 2025, 13 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, July, March and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 December 2025 | 13 hours 17 minutes | Carrier |
| 11 July 2026 | 4 hours 32 minutes | National Airspace System |
| 6 March 2026 | 3 hours 44 minutes | Extreme weather |
| 27 May 2026 | 2 hours 50 minutes | Carrier |
| 27 July 2026 | 2 hours 44 minutes | Extreme weather |
Delay causes
Why DL 2615 runs late
Carrier accounts for 51% of the 4,654 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 28%National Airspace System
- 11%Late-arriving aircraft
- 10%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,386 of the 4,654 delay minutes reported here. The split is drawn from 4,654 delay minutes reported on DL 2615.
Cancellations are rare at 0.82%, 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
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 954 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 365 flights under DL 2615 in the data flew ATL to FSD. 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. 365 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 2615
For a booking, read DL 2615 as 77.8% on time with 0.82% cancelled over 365 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
- 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.