Flight Reliability
DL 1532 · Delta Air Lines
Houston → Salt Lake City (IAH–SLC)
90
Nerd Approved
WanderNerd Reliability Score
- 85%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 0.6%
- Cancelled
- 12 min early
- Median arrival delay
Based on 328 historical flights. Data through May 2026.
What the data says
Wednesday is the weak spot.
DL 1532 arrived on time 92% of the time on Saturdays. On Wednesdays: 79%.
A bit ahead of the Delta Air Lines network.
DL 1532 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.
Slipping a little lately.
DL 1532 arrived on time 82% of the time over the last three months in the data, compared with 85% in the three months before that.
The breakdown
- Mon81%(47 flights)
- Tue89%(47 flights)
- Wed79%(47 flights)
- Thu90%(48 flights)
- Fri83%(48 flights)
- Sat92%(39 flights)
- Sun84%(49 flights)
- 9 AM–12 PM86%(231 flights)
- 12–3 PM84%(94 flights)
68%
May
Jun 90% → May 68% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 81% | 31 |
| August 2025 | 85% | 26 |
| September 2025 | 100% | 21 |
| October 2025 | 89% | 27 |
| November 2025 | 79% | 24 |
| December 2025 | 70% | 30 |
| January 2026 | 93% | 30 |
| February 2026 | 93% | 28 |
| March 2026 | 86% | 28 |
| April 2026 | 92% | 25 |
| May 2026 | 68% | 25 |
- Departures on time
- 83%
- Diverted
- 0.3%
- Flights flown
- 325
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 328 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.