Flight number record
DL 3125
Delta Air Lines · Indianapolis to Atlanta
- Route
- IND → ATL
- Departs
- 10:10
- Flights
- 256
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3125, check with Delta Air Lines.
DL 3125 earns an A−. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 19 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 256 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 3125's record is 19 points better than the US average of 77.3%. That gap is worth roughly 190 fewer late arrivals for every thousand flights.
Key figures
On time
96.3%
Arrivals under 15 minutes late, of 246 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
3.91%
National rate is 1.89%
1 hour+ late
0.8%
National rate is 8.3%
These figures cover 256 flights between September 2025 and August 2026. The median arrival is 17 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.
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 3125 flies
DL 3125 flies IND to ATL without a single fixed slot. Its most common scheduled departure was 10:10, used on 34 of 256 flights, with 10:07 (34 flights) and 10:20 (30 flights) next.
- Departs 10:1034 flights13.3%
- Departs 10:0734 flights13.3%
- Departs 10:2030 flights11.7%
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 10:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 3125 runs 12 points better at 96.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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 3125 next to IND to ATL
Every carrier on IND to ATL combined arrived on time 87.9% of the time across 3,122 flights, so DL 3125 is 8 points ahead of it. Delta flew 2,666 flights on the same city pair under all its flight numbers, including this one, and those ran 90.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3125thin sample | 256 | 96.3% | 53 min | 3.91% | A− |
| All Delta Air Lines on IND–ATL | 2,666 | 90.0% | 73 min | 1.28% | A |
| All carriers on IND–ATL | 3,122 | 87.9% | 68 min | 1.15% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3125 quarter by quarter
Quarter by quarter DL 3125 held fairly steady: 95.6% in Oct–Dec 2025, 91.4% in Jan–Mar 2026, 98.4% in Apr–Jun 2026 and 100.0% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202517 flights—
- Oct–Dec 202570 flights95.6%
- Jan–Mar 202660 flights91.4%
- Apr–Jun 202670 flights98.4%
- Jul–Sep 202639 flights100.0%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 3125 ranged from 95.1% on Monday to 97.7% on Tuesday. With about 37 flights behind each day, a spread of 3 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 3125 runs when it is late
DL 3125 often beats the schedule: 152 of 246 completed flights, 62%, arrived 15 minutes or more early. The 9 late arrivals split 3 under half an hour, 4 between 30 and 60 minutes, and 2 an hour or more.
- 15+ min early152 flights61.8%
- Within 15 min85 flights34.6%
- 15–29 min late3 flights1.2%
- 30–59 min late4 flights1.6%
- 1–2 hours late1 flights0.4%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 246 completed flights by arrival against schedule.
Only 12 of 246 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for DL 3125
The latest arrival of the period was on 7 December 2025, 2 hours 55 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 2 hours 55 minutes | Late-arriving aircraft |
| 2 April 2026 | 1 hour 19 minutes | Late-arriving aircraft |
| 6 February 2026 | 50 minutes | Late-arriving aircraft |
| 21 January 2026 | 45 minutes | Late-arriving aircraft |
| 5 January 2026 | 39 minutes | Late-arriving aircraft |
Delay causes
Why DL 3125 runs late
Late-arriving aircraft accounts for 75% of the 480 delay minutes carriers reported here, and the remaining four split what is left.
- 75%Late-arriving aircraft
- 15%National Airspace System
- 10%Extreme weather
75% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 480 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 480 delay minutes reported on DL 3125.
Cancellations run at 3.91%, against 1.89% nationally. That is about one flight in 25 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
Badly late arrivals are rare here: only 0.8% 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 same number turns up on one other city pair in the data, including ATL to IND (244), but none flew often enough under DL 3125 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IND to ATL only.
One caution: this is a thin sample. 256 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 3125
For a booking, the cancellation rate is the figure to plan around on DL 3125: 3.91% of its 256 scheduled flights did not operate. A late arrival costs roughly 55 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- IND to ATL, every carrier and departure
- ATL to IND, the return direction
- Delta Air Lines 3105 on the same route95.0%
- Delta Air Lines 3013 on the same route85.6%
- Delta Air Lines 3106 on the same route92.2%
- Delta Air Lines 3134 on the same route87.5%
- Indianapolis International (IND) delay statistics
- 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
- Why the first flight of the morning is statistically safest
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.