Flight Reliability
DL 1583 · Delta Air Lines
Houston → Salt Lake City (IAH–SLC)
90
Nerd Approved
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 0.3%
- Cancelled
- 7 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 1583 arrived on time 92% of the time on Tuesdays and just 73% on Sundays. That gap is worth planning around.
It basically never cancels.
Out of 365 scheduled flights, only 0.3% were cancelled.
The breakdown
- Mon81%(52 flights)
- Tue92%(52 flights)
- Wed83%(52 flights)
- Thu90%(52 flights)
- Fri83%(52 flights)
- Sat83%(52 flights)
- Sun73%(52 flights)
94%
May
Jun 63% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 63% | 30 |
| July 2025 | 90% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 77% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 87% | 31 |
| January 2026 | 87% | 30 |
| February 2026 | 82% | 28 |
| March 2026 | 81% | 31 |
| April 2026 | 83% | 30 |
| May 2026 | 94% | 31 |
- Departures on time
- 87%
- Diverted
- 0%
- Flights flown
- 364
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.