Flight number record

DL 1012

Delta Air Lines · Detroit to Austin

Route: DTW → AUS
Departs: 12:46
Flights: 278
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1012, check with Delta Air Lines.

DL 1012 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That is a workable record, not a spotless one. That rests on 278 flights, with a median arrival 7 minutes early.

On time

79.6%

Arrivals under 15 minutes late, of 274 completed flights

Avg delay

38 min

Across delayed arrivals only, not all flights

Cancelled

1.44%

National rate is 1.81%

1 hour+ late

3.3%

National rate is 8.1%

These figures cover 278 flights between July 2025 and June 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.

Schedule

When DL 1012 flies

DL 1012 flies DTW to AUS without a single fixed slot. Its most common scheduled departure was 12:46, used on 61 of 278 flights, with 12:16 (36 flights) and 12:37 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:4661 flights21.9%
Departs 12:1636 flights12.9%
Departs 12:3732 flights11.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 12:46 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1012 runs level with that at 79.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1012 next to DTW to AUS

Every carrier on DTW to AUS combined arrived on time 79.8% of the time across 1,334 flights, so DL 1012 is about level with it. Delta flew 1,283 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 2 points.

DL 1012 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1012thin sample	278	79.6%	38 min	1.44%	B
All Delta Air Lines on DTW–AUS	1,283	79.6%	52 min	1.25%	B
All carriers on DTW–AUS	1,334	79.8%	53 min	1.20%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1012 quarter by quarter

DL 1012 did not run the same all year. Its best quarter was Oct–Dec 2025 at 83.1% on time and its weakest Jul–Sep 2025 at 71.8%, a swing of 11 points on roughly 93 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 202587 flights71.8%
Oct–Dec 202578 flights83.1%
Jan–Mar 202624 flights—
Apr–Jun 202689 flights79.8%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1012 did best on Tuesday at 87.5% on time and worst on Thursday at 64.1%. Each day rests on about 40 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1012 runs late

One category carries most of the weight here. National Airspace System accounts for 46% of the 2,147 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
46%
Carrier
41%
Late-arriving aircraft
11%
Extreme weather
3%

The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 884 of the 2,147 delay minutes reported here. The split is drawn from 2,147 delay minutes reported on DL 1012.

Cancellations sit at 1.44% against a national 1.81%, 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 3.3% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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. 278 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 79.6% on time with 1.44% cancelled over 278 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures