Flight number record

DL 1612

Delta Air Lines · Detroit to Austin

Route: DTW → AUS
Departs: 16:15
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1612, check with Delta Air Lines.

DL 1612 lands a B+, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 322 flights, with a median arrival 6 minutes early.

On time

77.8%

Arrivals under 15 minutes late, of 320 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.62%

National rate is 1.81%

1 hour+ late

6.2%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. The median arrival is 6 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 1612 flies

DL 1612 flies DTW to AUS without a single fixed slot. Its most common scheduled departure was 16:15, used on 69 of 322 flights, with 16:25 (36 flights) and 16:20 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:1569 flights21.4%
Departs 16:2536 flights11.2%
Departs 16:2033 flights10.2%

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 16:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1612 runs 5 points better at 77.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1612 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 1612 is 2 points behind 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 4 points.

DL 1612 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1612thin sample	322	77.8%	54 min	0.62%	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 1612 quarter by quarter

DL 1612 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.4% on time and its weakest Oct–Dec 2025 at 70.0%, a swing of 15 points on roughly 81 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 202579 flights73.4%
Oct–Dec 202570 flights70.0%
Jan–Mar 202690 flights80.9%
Apr–Jun 202683 flights85.4%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1612 did best on Tuesday at 89.8% on time and worst on Monday at 67.3%. Each day rests on about 46 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1612 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,820 reported delay minutes.

Carrier
38%
National Airspace System
38%
Late-arriving aircraft
17%
Extreme weather
7%

The largest share of delay minutes, 38%, 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 1,453 of the 3,820 delay minutes reported here. The split is drawn from 3,820 delay minutes reported on DL 1612.

Cancellations are rare at 0.62%, below the national 1.81% 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

6.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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.

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.

Every one of the 322 flights under DL 1612 in the data flew DTW to AUS. 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. 322 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 1612

For a booking, read DL 1612 as 77.8% on time with 0.62% cancelled over 322 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