Flight number record
DL 3105
Delta Air Lines · Indianapolis to Atlanta
- Route
- IND → ATL
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3105, check with Delta Air Lines.
DL 3105 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 3105's record is 18 points better than the US average of 77.3%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.
Key figures
On time
95.0%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 365 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.
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Schedule
When DL 3105 flies
DL 3105 is scheduled to leave Indianapolis (IND) at 06:00 local time and reach Atlanta (ATL) at 07:37. That slot held for 338 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00338 flights92.6%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 3105 runs 6 points better at 95.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 3105 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 3105 is 7 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 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3105 | 365 | 95.0% | 81 min | 1.64% | 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 3105 quarter by quarter
Quarter by quarter DL 3105 held fairly steady: 100.0% in Jul–Sep 2025, 95.6% in Oct–Dec 2025, 90.7% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 95.2% 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 202530 flights100.0%
- Oct–Dec 202592 flights95.6%
- Jan–Mar 202690 flights90.7%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%.
By weekday, DL 3105 ranged from 90.4% on Wednesday to 100.0% on Saturday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 3105 runs when it is late
DL 3105 often beats the schedule: 206 of 359 completed flights, 57%, arrived 15 minutes or more early. The 18 late arrivals split 5 under half an hour, 6 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early206 flights57.4%
- Within 15 min135 flights37.6%
- 15–29 min late5 flights1.4%
- 30–59 min late6 flights1.7%
- 1–2 hours late5 flights1.4%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
Only 17 of 359 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 3105
The latest arrival of the period was on 5 July 2026, 5 hours 45 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 July 2026 | 5 hours 45 minutes | Carrier |
| 12 March 2026 | 4 hours 55 minutes | Carrier |
| 16 March 2026 | 1 hour 58 minutes | Extreme weather |
| 8 December 2025 | 1 hour 34 minutes | Carrier |
| 2 March 2026 | 1 hour 25 minutes | National Airspace System |
Delay causes
Why DL 3105 runs late
Carrier accounts for 75% of the 1,451 delay minutes carriers reported here, and the remaining four split what is left.
- 75%Carrier
- 18%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 75%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,090 of the 1,451 delay minutes reported here. The split is drawn from 1,451 delay minutes reported on DL 3105.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.9% 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.
Every one of the 365 flights under DL 3105 in the data flew IND to ATL. 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 3105
For a booking, read DL 3105 as 95.0% on time with 1.64% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IND to ATL, every carrier and departure
- ATL to IND, the return direction
- 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%
- Delta Air Lines 3125 on the same route96.3%
- 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
- Worst months to fly in the US, ranked by the data
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.