Flight number record
DL 1572
Delta Air Lines · Houston to Atlanta
- Route
- IAH → ATL
- Departs
- 14:59
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1572, check with Delta Air Lines.
DL 1572 lands a B, about a point better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 307 flights, with a median arrival 9 minutes early.
Key figures
On time
78.1%
Arrivals under 15 minutes late, of 302 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
1.30%
National rate is 1.89%
1 hour+ late
6.3%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. The median arrival is 9 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 1572 flies
DL 1572 flies IAH to ATL without a single fixed slot. Its most common scheduled departure was 14:59, used on 55 of 307 flights, with 16:21 (32 flights) next.
- Departs 14:5955 flights17.9%
- Departs 16:2132 flights10.4%
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 14:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 1572 runs 6 points better at 78.1%. 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 1572 next to IAH to ATL
Every carrier on IAH to ATL combined arrived on time 76.8% of the time across 4,960 flights, so DL 1572 is about level with it. Delta flew 2,543 flights on the same city pair under all its flight numbers, including this one, and those ran 80.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1572thin sample | 307 | 78.1% | 71 min | 1.30% | B |
| All Delta Air Lines on IAH–ATL | 2,543 | 80.4% | 70 min | 2.04% | B |
| All carriers on IAH–ATL | 4,960 | 76.8% | 68 min | 1.92% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1572 quarter by quarter
DL 1572 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 65.6%, a swing of 21 points on roughly 61 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 flights86.7%
- Oct–Dec 202577 flights81.6%
- Jan–Mar 202648 flights80.4%
- Apr–Jun 202690 flights79.8%
- Jul–Sep 202662 flights65.6%
Scale runs 55% to 90%.
By weekday, DL 1572 did best on Monday at 84.4% on time and worst on Sunday at 68.3%. Each day rests on about 44 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1572 runs when it is late
DL 1572 often beats the schedule: 85 of 302 completed flights, 28%, arrived 15 minutes or more early. The 66 late arrivals split 26 under half an hour, 21 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early85 flights28.1%
- Within 15 min151 flights50.0%
- 15–29 min late26 flights8.6%
- 30–59 min late21 flights7.0%
- 1–2 hours late7 flights2.3%
- 2+ hours late12 flights4.0%
Scale runs 0% to 100%.
Share of 302 completed flights by arrival against schedule.
10 of 66 late departures made up the time and arrived on time, 15% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 1572
The latest arrival of the period was on 8 October 2025, 6 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across October, June, November, March and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 October 2025 | 6 hours 17 minutes | Carrier |
| 20 June 2026 | 6 hours 7 minutes | Carrier |
| 8 November 2025 | 4 hours 30 minutes | National Airspace System |
| 11 March 2026 | 4 hours 23 minutes | Late-arriving aircraft |
| 11 July 2026 | 3 hours 29 minutes | National Airspace System |
Delay causes
Why DL 1572 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 4,652 reported delay minutes.
- 33%Late-arriving aircraft
- 32%National Airspace System
- 32%Carrier
- 3%Extreme weather
32% 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 1,503 minutes out of 4,652, against a national NAS share of 21%. The split is drawn from 4,652 delay minutes reported on DL 1572.
Cancellations sit at 1.30% against a national 1.89%, which is ordinary. Diversions add another 0.33%.
Connections and routes
What a delay on this flight costs
6.3% 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 a little over an hour, which a normal layover absorbs.
The 689 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 one other city pair in the data, including ATL to IAH (200), but none flew often enough under DL 1572 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to ATL only.
One caution: this is a thin sample. 307 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 1572
For a booking, read DL 1572 as 78.1% on time with 1.30% cancelled over 307 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to ATL, every carrier and departure
- ATL to IAH, the return direction
- Delta Air Lines 1315 on the same route88.3%
- Frontier Airlines 1404 on the same route68.3%
- Delta Air Lines 1069 on the same route91.9%
- Delta Air Lines 1682 on the same route78.2%
- Delta Air Lines 1585 on the same route77.8%
- United Airlines 1030 on the same route90.6%
- George Bush Intercontinental (IAH) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.