Flight Reliability
DL 3684 · Delta Air Lines
Detroit → LAN (DTW–LAN)92% of its flights flew this route. The rest (DTW–GRB, BOI–SLC) are included in these numbers.
- 78%
- Arrive within 15 minutes
- 19 min
- Average arrival delay
- 0.9%
- Cancelled
- 5 min early
- Median arrival delay
Based on 325 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 3684 arrived on time 90% of the time on Saturdays and just 64% on Sundays. That gap is worth planning around.
A bit ahead of the DTW–LAN route.
DL 3684 arrived on time 78% of the time, versus 75% across the DTW–LAN route.
A bit behind the Delta Air Lines network.
DL 3684 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 3684 arrived on time 76% of the time over the last three months in the data, compared with 64% in the three months before that.
The breakdown
- Mon87%(46 flights)
- Tue76%(46 flights)
- Wed71%(44 flights)
- Thu83%(46 flights)
- Fri75%(44 flights)
- Sat90%(51 flights)
- Sun64%(45 flights)
- 6–9 AM—(5 flights)
- 9 AM–12 PM—(4 flights)
- 6–9 PM80%(40 flights)
- 9 PM–12 AM77%(273 flights)
Jun 80% → May 93% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 80% | 30 |
| July 2025 | 90% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 90% | 31 |
| December 2025 | 61% | 31 |
| January 2026 | 60% | 30 |
| February 2026 | 71% | 28 |
| March 2026 | 55% | 29 |
| April 2026 | 80% | 30 |
| May 2026 | 93% | 14 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 322
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 325 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.