Flight number record
DL 1532
Delta Air Lines · Houston to Salt Lake City
- Route
- IAH → SLC
- Departs
- 11:34
- Flights
- 324
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1532, check with Delta Air Lines.
DL 1532 lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 324 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1532's record is 7 points better than the US average of 77.3%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.
Key figures
On time
83.8%
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 1.89%
1 hour+ late
5.0%
National rate is 8.3%
These figures cover 324 flights between September 2025 and August 2026. The median arrival is 10 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 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.
- Departs 11:3450 flights15.4%
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 11:34 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1532 runs 6 points better at 83.8%. 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 1532 next to IAH to SLC
Every carrier on IAH to SLC combined arrived on time 83.4% of the time across 1,932 flights, so DL 1532 is about level with it. Delta flew 1,016 flights on the same city pair under all its flight numbers, including this one, and those ran 83.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1532thin sample | 324 | 83.8% | 56 min | 0.62% | B+ |
| All Delta Air Lines on IAH–SLC | 1,016 | 83.3% | 90 min | 0.39% | B+ |
| All carriers on IAH–SLC | 1,932 | 83.4% | 78 min | 0.47% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2026 at 77.2%, a swing of 14 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 202521 flights—
- Oct–Dec 202582 flights79.0%
- Jan–Mar 202687 flights90.7%
- Apr–Jun 202677 flights81.6%
- Jul–Sep 202657 flights77.2%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1532 did best on Saturday at 90.0% on time and worst on Friday at 77.6%. Each day rests on about 46 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1532 runs when it is late
DL 1532 often beats the schedule: 112 of 321 completed flights, 35%, arrived 15 minutes or more early. The 52 late arrivals split 16 under half an hour, 20 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early112 flights34.9%
- Within 15 min157 flights48.9%
- 15–29 min late16 flights5.0%
- 30–59 min late20 flights6.2%
- 1–2 hours late10 flights3.1%
- 2+ hours late6 flights1.9%
Scale runs 0% to 100%.
Share of 321 completed flights by arrival against schedule.
A late pushback is often recovered here: of 67 departures that left 15 minutes late or more, 22 still arrived on time. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 1532
The latest arrival of the period was on 19 February 2026, 2 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 February 2026 | 2 hours 35 minutes | Late-arriving aircraft |
| 13 January 2026 | 2 hours 33 minutes | Late-arriving aircraft |
| 29 August 2026 | 2 hours 28 minutes | Carrier |
| 7 December 2025 | 2 hours 8 minutes | Late-arriving aircraft |
| 5 December 2025 | 2 hours 4 minutes | Late-arriving aircraft |
Delay causes
Why DL 1532 runs late
Late-arriving aircraft accounts for 63% of the 2,905 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Late-arriving aircraft
- 24%Carrier
- 9%National Airspace System
- 5%Extreme weather
63% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,905 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 2,905 delay minutes reported on DL 1532.
Cancellations are rare at 0.62%, 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
5.0% 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 1,195 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.
The same number turns up on two other city pairs in the data, including LGA to DCA (7) 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 83.8% on time with 0.62% cancelled over 324 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to SLC, every carrier and departure
- SLC to IAH, the return direction
- Delta Air Lines 1583 on the same route86.0%
- United Airlines 2157 on the same route76.9%
- United Airlines 2242 on the same route86.0%
- George Bush Intercontinental (IAH) delay statistics
- Salt Lake City International (SLC) 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.