Flight number record
DL 3134
Delta Air Lines · Atlanta to Indianapolis
- Route
- ATL → IND
- Departs
- 13:48
- Flights
- 356
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3134, check with Delta Air Lines.
DL 3134 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 roughly 55 minutes on average. That rests on 356 flights, with a median arrival 4 minutes early.
Set against the rest of the country, DL 3134's record is 4 points better than the US average of 77.3%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.
Key figures
On time
81.4%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
1 hour+ late
5.4%
National rate is 8.3%
These figures cover 356 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 3134 flies
DL 3134 flies ATL to IND without a single fixed slot. Its most common scheduled departure was 13:48, used on 86 of 356 flights, with 14:10 (58 flights) next.
- Departs 13:4886 flights24.2%
- Departs 14:1058 flights16.3%
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 13:48 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 3134 runs 3 points better at 81.4%. 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 3134 next to ATL to IND
Every carrier on ATL to IND combined arrived on time 81.8% of the time across 3,125 flights, so DL 3134 is about level with it. Delta flew 2,667 flights on the same city pair under all its flight numbers, including this one, and those ran 83.0% 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 3134thin sample | 356 | 81.4% | 53 min | 0.56% | B+ |
| All Delta Air Lines on ATL–IND | 2,667 | 83.0% | 57 min | 1.31% | B |
| All carriers on ATL–IND | 3,125 | 81.8% | 56 min | 1.18% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3134 quarter by quarter
DL 3134 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 71.0%, a swing of 19 points on roughly 71 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 flights90.0%
- Oct–Dec 202588 flights87.5%
- Jan–Mar 202685 flights81.9%
- Apr–Jun 202691 flights79.1%
- Jul–Sep 202662 flights71.0%
Scale runs 65% to 95%.
By weekday, DL 3134 ranged from 78.4% on Thursday to 84.8% on Saturday. With about 51 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 3134 runs when it is late
The 66 late arrivals split 31 under half an hour, 16 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early30 flights8.5%
- Within 15 min258 flights72.9%
- 15–29 min late31 flights8.8%
- 30–59 min late16 flights4.5%
- 1–2 hours late13 flights3.7%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 354 completed flights by arrival against schedule.
9 of 60 late departures made up the time and arrived on time, 15% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 3134
The latest arrival of the period was on 17 March 2026, 5 hours 55 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across March, December, May and September, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 March 2026 | 5 hours 55 minutes | Carrier |
| 7 December 2025 | 2 hours 58 minutes | Extreme weather |
| 18 May 2026 | 2 hours 32 minutes | Carrier |
| 16 March 2026 | 2 hours 28 minutes | Late-arriving aircraft |
| 14 September 2025 | 2 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why DL 3134 runs late
Carrier accounts for 48% of the 3,494 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 25%Late-arriving aircraft
- 20%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,669 of the 3,494 delay minutes reported here. The split is drawn from 3,494 delay minutes reported on DL 3134.
Cancellations are rare at 0.56%, 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
5.4% 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 roughly 55 minutes, which a normal layover absorbs.
DL 3134 is not only a ATL to IND flight. It also flew IND to ATL (273 flights, 87.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 356 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| IND to ATLthin sample | 273 | 87.5% | 91 min | 0.37% | A+ |
What to do with this
Booking DL 3134
For a booking, read DL 3134 as 81.4% on time with 0.56% cancelled over 356 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to IND, every carrier and departure
- IND to ATL, the return direction
- Delta Air Lines 3013 on the same route88.3%
- Delta Air Lines 3120 on the same route79.9%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Indianapolis International (IND) 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.