Flight Reliability
DL 1389 · Delta Air Lines
Houston → Detroit (IAH–DTW)
92
Nerd Approved
WanderNerd Reliability Score
- 90%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 1.6%
- Cancelled
- 9 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Thursday is the weak spot.
DL 1389 arrived on time 94% of the time on Wednesdays. On Thursdays: 87%.
Better than the IAH–DTW route average.
DL 1389 arrived on time 90% of the time, versus 81% across the IAH–DTW route.
Better than the Delta Air Lines network average.
DL 1389 arrived on time 90% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 1389 arrived on time 91% of the time over the last three months in the data, compared with 86% in the three months before that.
The breakdown
- Mon90%(50 flights)
- Tue90%(52 flights)
- Wed94%(52 flights)
- Thu87%(52 flights)
- Fri92%(51 flights)
- Sat88%(51 flights)
- Sun88%(51 flights)
100%
May
Jun 90% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 29 |
| July 2025 | 94% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 100% | 29 |
| December 2025 | 90% | 30 |
| January 2026 | 87% | 30 |
| February 2026 | 82% | 28 |
| March 2026 | 76% | 29 |
| April 2026 | 97% | 30 |
| May 2026 | 100% | 31 |
- Departures on time
- 92%
- Diverted
- 0%
- Flights flown
- 359
- 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.