Flight number record
DL 1012
Delta Air Lines · Detroit to Austin
- Route
- DTW → AUS
- Departs
- 12:53
- Flights
- 279
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1012, check with Delta Air Lines.
DL 1012 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 about 40 minutes on average. That rests on 279 flights, with a median arrival 7 minutes early.
Key figures
On time
80.8%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
41 min
Across delayed arrivals only, not all flights
Cancelled
1.08%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 279 flights between September 2025 and August 2026. The median arrival is 7 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 1012 flies
DL 1012 flies DTW to AUS without a single fixed slot. Its most common scheduled departure was 12:53, used on 52 of 279 flights, with 12:16 (36 flights) and 12:37 (32 flights) next.
- Departs 12:5352 flights18.6%
- Departs 12:1636 flights12.9%
- Departs 12:3732 flights11.5%
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 12:53 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1012 runs 3 points better at 80.8%. 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 1012 next to DTW to AUS
Every carrier on DTW to AUS combined arrived on time 80.1% of the time across 1,307 flights, so DL 1012 is about level with it. Delta flew 1,290 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% 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 1012thin sample | 279 | 80.8% | 41 min | 1.08% | B |
| All Delta Air Lines on DTW–AUS | 1,290 | 80.1% | 53 min | 1.40% | B |
| All carriers on DTW–AUS | 1,307 | 80.1% | 53 min | 1.38% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1012 quarter by quarter
DL 1012 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 64.9%, a swing of 32 points on roughly 70 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 flights96.7%
- Oct–Dec 202578 flights83.1%
- Jan–Mar 202624 flights—
- Apr–Jun 202689 flights79.8%
- Jul–Sep 202658 flights64.9%
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1012 did best on Tuesday at 85.4% on time and worst on Friday at 71.8%. Each day rests on about 40 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1012 runs when it is late
DL 1012 often beats the schedule: 81 of 276 completed flights, 29%, arrived 15 minutes or more early. Most of the lateness is short. 28 of the 53 late arrivals were under half an hour behind, and 10 reached an hour or more.
- 15+ min early81 flights29.3%
- Within 15 min142 flights51.4%
- 15–29 min late28 flights10.1%
- 30–59 min late15 flights5.4%
- 1–2 hours late8 flights2.9%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 276 completed flights by arrival against schedule.
7 of 33 late departures made up the time and arrived on time, 21% of them. In the other direction, 27 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 AUS.
The worst days
Worst days for DL 1012
The latest arrival of the period was on 19 August 2026, 2 hours 40 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across August, November, July and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 August 2026 | 2 hours 40 minutes | Late-arriving aircraft |
| 29 November 2025 | 2 hours 6 minutes | Carrier |
| 13 July 2026 | 1 hour 50 minutes | National Airspace System |
| 10 July 2026 | 1 hour 26 minutes | Extreme weather |
| 2 May 2026 | 1 hour 23 minutes | Carrier |
Delay causes
Why DL 1012 runs late
National Airspace System accounts for 47% of the 2,170 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 31%Carrier
- 16%Late-arriving aircraft
- 6%Extreme weather
47% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,027 minutes out of 2,170, against a national NAS share of 21%. The split is drawn from 2,170 delay minutes reported on DL 1012.
Cancellations sit at 1.08% 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 3.6% 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 1,149 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 three other city pairs in the data, including ATL to SGF (50), SGF to ATL (19) and SEA to SFO (16), but none flew often enough under DL 1012 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to AUS only.
One caution: this is a thin sample. 279 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 1012
For a booking, read DL 1012 as 80.8% on time with 1.08% cancelled over 279 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to AUS, every carrier and departure
- AUS to DTW, the return direction
- Delta Air Lines 1218 on the same route83.5%
- Delta Air Lines 1612 on the same route80.1%
- Delta Air Lines 2578 on the same route74.7%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Austin-Bergstrom International (AUS) 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.