Flight number record
DL 2578
Delta Air Lines · Detroit to Austin
- Route
- DTW → AUS
- Departs
- 20:00
- Flights
- 304
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2578, check with Delta Air Lines.
DL 2578 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 304 flights, with a median arrival 4 minutes early.
Key figures
On time
74.7%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
2.30%
National rate is 1.89%
1 hour+ late
6.4%
National rate is 8.3%
These figures cover 304 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 2578 flies
DL 2578 flies DTW to AUS without a single fixed slot. Its most common scheduled departure was 20:00, used on 60 of 304 flights, with 19:45 (37 flights) and 19:55 (34 flights) next.
- Departs 20:0060 flights19.7%
- Departs 19:4537 flights12.2%
- Departs 19:5534 flights11.2%
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 20:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2578 runs 5 points better at 74.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2578 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 2578 is 5 points behind 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%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2578thin sample | 304 | 74.7% | 57 min | 2.30% | C |
| 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 2578 quarter by quarter
DL 2578 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.4% on time and its weakest Jul–Sep 2026 at 61.7%, a swing of 25 points on roughly 76 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 202521 flights—
- Oct–Dec 202587 flights83.9%
- Jan–Mar 202646 flights86.4%
- Apr–Jun 202689 flights64.7%
- Jul–Sep 202661 flights61.7%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2578 did best on Saturday at 84.2% on time and worst on Monday at 62.2%. Each day rests on about 43 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2578 runs when it is late
DL 2578 often beats the schedule: 76 of 297 completed flights, 26%, arrived 15 minutes or more early. The 75 late arrivals split 24 under half an hour, 32 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early76 flights25.6%
- Within 15 min146 flights49.2%
- 15–29 min late24 flights8.1%
- 30–59 min late32 flights10.8%
- 1–2 hours late13 flights4.4%
- 2+ hours late6 flights2.0%
Scale runs 0% to 100%.
Share of 297 completed flights by arrival against schedule.
12 of 71 late departures made up the time and arrived on time, 17% of them. In the other direction, 16 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 2578
The latest arrival of the period was on 3 July 2026, 4 hours 49 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across July, March, December and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 July 2026 | 4 hours 49 minutes | Late-arriving aircraft |
| 15 March 2026 | 4 hours 31 minutes | National Airspace System |
| 14 December 2025 | 3 hours 54 minutes | Carrier |
| 21 July 2026 | 3 hours 52 minutes | Carrier |
| 10 August 2026 | 2 hours 53 minutes | Late-arriving aircraft |
Delay causes
Why DL 2578 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 4,267 reported delay minutes.
- 41%Carrier
- 35%Late-arriving aircraft
- 22%National Airspace System
- 3%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,267 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 4,267 delay minutes reported on DL 2578.
Cancellations sit at 2.30% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
6.4% 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 about an hour, 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.
Every one of the 304 flights under DL 2578 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. 304 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 2578
For a booking, DL 2578 is one of the weaker ways to fly DTW to AUS: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
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 1012 on the same route80.8%
- 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
- Why the first flight of the morning is statistically safest
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.