Flight number record

DL 1532

Delta Air Lines · Houston to Salt Lake City

Route: IAH → SLC
Departs: 11:34
Flights: 324
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1532, check with Delta Air Lines.

DL 1532 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 324 flights, with a median arrival 11 minutes early.

Set against the rest of the country, DL 1532's record is 7 points better than the US average of 77.6%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.

On time

84.7%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

0.62%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 324 flights between July 2025 and June 2026. The median arrival is 11 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 1532 flies

DL 1532 flies IAH to SLC without a single fixed slot. Its most common scheduled departure was 11:34, used on 50 of 324 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:3450 flights15.4%

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 11:34 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1532 runs 6 points better at 84.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1532 next to IAH to SLC

Every carrier on IAH to SLC combined arrived on time 82.6% of the time across 1,957 flights, so DL 1532 is 2 points ahead of it. Delta flew 1,011 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 1532 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1532thin sample	324	84.7%	56 min	0.62%	B+
All Delta Air Lines on IAH–SLC	1,011	82.7%	93 min	0.30%	B+
All carriers on IAH–SLC	1,957	82.6%	79 min	0.51%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1532 quarter by quarter

DL 1532 did not run the same all year. Its best quarter was Jan–Mar 2026 at 90.7% on time and its weakest Oct–Dec 2025 at 79.0%, a swing of 12 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 202578 flights87.2%
Oct–Dec 202582 flights79.0%
Jan–Mar 202687 flights90.7%
Apr–Jun 202677 flights81.6%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1532 did best on Saturday at 91.4% on time and worst on Friday at 79.2%. Each day rests on about 46 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1532 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 63% of the 2,734 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
63%
Carrier
17%
National Airspace System
14%
Extreme weather
6%

63% 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 2,734 reported delay minutes here, that single category outweighs weather by 11 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 2,734 delay minutes reported on DL 1532.

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

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 1,195 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 two other city pairs in the data, including LGA to DCA (3) and SLC to IAH (1), but none flew often enough under DL 1532 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to SLC only.

One caution: this is a thin sample. 324 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 1532

For a booking, read DL 1532 as 84.7% on time with 0.62% cancelled over 324 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