Flight number record

DL 1572

Delta Air Lines · Houston to Atlanta

Route: IAH → ATL
Departs: 14:59
Flights: 304
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 304 flights, with a median arrival 8 minutes early.

On time

78.9%

Arrivals under 15 minutes late, of 299 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

1.32%

National rate is 1.81%

1 hour+ late

5.7%

National rate is 8.1%

These figures cover 304 flights between July 2025 and June 2026. The median arrival is 8 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 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 304 flights, with 15:55 (35 flights) and 16:21 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:5955 flights18.1%
Departs 15:5535 flights11.5%
Departs 16:2132 flights10.5%

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 14:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1572 runs 7 points better at 78.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1572 next to IAH to ATL

Every carrier on IAH to ATL combined arrived on time 77.5% of the time across 4,906 flights, so DL 1572 is about level with it. Delta flew 2,507 flights on the same city pair under all its flight numbers, including this one, and those ran 80.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 1572 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1572thin sample	304	78.9%	68 min	1.32%	B
All Delta Air Lines on IAH–ATL	2,507	80.2%	66 min	2.07%	B
All carriers on IAH–ATL	4,906	77.5%	67 min	1.92%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1572 quarter by quarter

Quarter by quarter DL 1572 held fairly steady: 75.0% in Jul–Sep 2025, 81.6% in Oct–Dec 2025, 80.4% in Jan–Mar 2026 and 79.8% in Apr–Jun 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 202589 flights75.0%
Oct–Dec 202577 flights81.6%
Jan–Mar 202648 flights80.4%
Apr–Jun 202690 flights79.8%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1572 ranged from 72.5% on Sunday to 82.9% on Friday. With about 43 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1572 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 44% of the 4,306 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.

Late-arriving aircraft
44%
Carrier
34%
National Airspace System
19%
Extreme weather
3%

44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,306 reported delay minutes here, that single category outweighs weather by 14 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,306 delay minutes reported on DL 1572.

Cancellations sit at 1.32% against a national 1.81%, which is ordinary. Diversions add another 0.33%.

Connections and routes

What a delay on this flight costs

5.7% 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 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. 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 one other city pair in the data, including ATL to IAH (197), 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. 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 1572

For a booking, read DL 1572 as 78.9% on time with 1.32% cancelled over 304 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