Flight Reliability
DL 728 · Delta Air Lines
Detroit → Seattle (DTW–SEA)
82
Pretty Reliable
WanderNerd Reliability Score
- 78%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.8%
- Cancelled
- 7 min early
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 728 arrived on time 87% of the time on Tuesdays. On Fridays: 73%.
A bit ahead of the DTW–SEA route.
DL 728 arrived on time 78% of the time, versus 74% across the DTW–SEA route.
A bit behind the Delta Air Lines network.
DL 728 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 728 arrived on time 78% of the time over the last three months in the data, compared with 63% in the three months before that.
The breakdown
- Mon73%(52 flights)
- Tue87%(52 flights)
- Wed79%(52 flights)
- Thu82%(51 flights)
- Fri73%(51 flights)
- Sat78%(50 flights)
- Sun77%(52 flights)
87%
May
Jun 77% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 30 |
| July 2025 | 90% | 31 |
| August 2025 | 97% | 30 |
| September 2025 | 93% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 69% | 29 |
| December 2025 | 36% | 31 |
| January 2026 | 81% | 31 |
| February 2026 | 71% | 28 |
| March 2026 | 57% | 28 |
| April 2026 | 90% | 30 |
| May 2026 | 87% | 31 |
- Departures on time
- 87%
- Diverted
- 0.3%
- Flights flown
- 360
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.