Flight Reliability
DL 1798 · Delta Air Lines
Detroit → Houston (DTW–IAH)92% of its flights flew this route. The rest (SJU–JFK, ATL–AGS) are included in these numbers.
- 85%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 1.4%
- Cancelled
- 6 min early
- Median arrival delay
Based on 212 historical flights. Data through May 2026.
What the data says
The 6–9 AM departure wins.
DL 1798 departing between 6–9 AM arrived on time 86% of the time, versus 69% between 3–6 AM.
Sunday scaries are real for this one.
DL 1798 arrived on time 93% of the time on Thursdays and just 77% on Sundays. That gap is worth planning around.
A bit ahead of the DTW–IAH route.
DL 1798 arrived on time 85% of the time, versus 81% across the DTW–IAH route.
A bit ahead of the Delta Air Lines network.
DL 1798 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon90%(31 flights)
- Tue83%(30 flights)
- Wed90%(31 flights)
- Thu93%(30 flights)
- Fri77%(30 flights)
- Sat85%(27 flights)
- Sun77%(30 flights)
- 3–6 AM69%(13 flights)
- 6–9 AM86%(195 flights)
- 9 PM–12 AM—(1 flights)
Jun 78% → Dec 66% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 78% | 23 |
| July 2025 | 87% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 83% | 30 |
| December 2025 | 66% | 29 |
- Departures on time
- 89%
- Diverted
- 0%
- Flights flown
- 209
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 212 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.