Flight number record
DL 1232
Delta Air Lines · Atlanta to Detroit
- Route
- ATL → DTW
- Departs
- 20:30
- Flights
- 303
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1232, check with Delta Air Lines.
DL 1232 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 303 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 1232 runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 301 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.66%
National rate is 1.89%
1 hour+ late
11.6%
National rate is 8.3%
These figures cover 303 flights between September 2025 and August 2026. Beyond the headline rate, 11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 1232 flies
DL 1232 flies ATL to DTW without a single fixed slot. Its most common scheduled departure was 20:30, used on 53 of 303 flights, with 20:45 (38 flights) next.
- Departs 20:3053 flights17.5%
- Departs 20:4538 flights12.5%
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 20:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1232 runs 3 points worse at 66.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 1232 next to ATL to DTW
Every carrier on ATL to DTW combined arrived on time 76.4% of the time across 4,821 flights, so DL 1232 is 10 points behind it. Delta flew 3,774 flights on the same city pair under all its flight numbers, including this one, and those ran 77.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1232thin sample | 303 | 66.8% | 59 min | 0.66% | C+ |
| All Delta Air Lines on ATL–DTW | 3,774 | 77.9% | 60 min | 0.50% | B+ |
| All carriers on ATL–DTW | 4,821 | 76.4% | 64 min | 0.81% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1232 quarter by quarter
Quarter by quarter DL 1232 held fairly steady: 67.7% in Oct–Dec 2025, 64.6% in Jan–Mar 2026, 69.8% in Apr–Jun 2026 and 62.9% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202512 flights—
- Oct–Dec 202563 flights67.7%
- Jan–Mar 202680 flights64.6%
- Apr–Jun 202686 flights69.8%
- Jul–Sep 202662 flights62.9%
Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1232 did best on Tuesday at 78.6% on time and worst on Sunday at 50.0%. Each day rests on about 43 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1232 runs when it is late
The 100 late arrivals split 35 under half an hour, 30 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early45 flights15.0%
- Within 15 min156 flights51.8%
- 15–29 min late35 flights11.6%
- 30–59 min late30 flights10.0%
- 1–2 hours late23 flights7.6%
- 2+ hours late12 flights4.0%
Scale runs 0% to 100%.
Share of 301 completed flights by arrival against schedule.
18 of 110 late departures made up the time and arrived on time, 16% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for DL 1232
The latest arrival of the period was on 26 August 2026, 4 hours 37 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 August 2026 | 4 hours 37 minutes | Carrier |
| 6 March 2026 | 4 hours 4 minutes | Extreme weather |
| 9 November 2025 | 3 hours 2 minutes | Carrier |
| 9 July 2026 | 3 hours 1 minute | Late-arriving aircraft |
| 27 August 2026 | 2 hours 51 minutes | Carrier |
Delay causes
Why DL 1232 runs late
Carrier accounts for 55% of the 5,861 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 26%Late-arriving aircraft
- 10%National Airspace System
- 9%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,210 of the 5,861 delay minutes reported here. The split is drawn from 5,861 delay minutes reported on DL 1232.
Cancellations are rare at 0.66%, 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
11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 594 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 303 flights under DL 1232 in the data flew ATL to DTW. 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. 303 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 1232
For a booking, DL 1232 is one of the weaker ways to fly ATL to DTW: 10 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
- ATL to DTW, every carrier and departure
- DTW to ATL, the return direction
- Delta Air Lines 1298 on the same route84.3%
- Delta Air Lines 1031 on the same route83.9%
- Delta Air Lines 1240 on the same route82.7%
- Delta Air Lines 1646 on the same route90.6%
- Delta Air Lines 1005 on the same route75.2%
- Delta Air Lines 2940 on the same route72.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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
- How often a connection fails at the major US hubs
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.