Flight Reliability
DL 4880 · Delta Air Lines
Detroit → Grand Rapids (DTW–GRR)94% of its flights flew this route. The rest (ATL–ROA, ROA–ATL) are included in these numbers.
- 78%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 1.9%
- Cancelled
- 5 min early
- Median arrival delay
Based on 160 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 4880 arrived on time 88% of the time on Tuesdays and just 57% on Sundays. That gap is worth planning around.
A bit ahead of the DTW–GRR route.
DL 4880 arrived on time 78% of the time, versus 73% across the DTW–GRR route.
A bit behind the Delta Air Lines network.
DL 4880 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 4880 arrived on time 82% of the time over the last three months in the data, compared with 73% in the three months before that.
The breakdown
- Mon80%(25 flights)
- Tue88%(24 flights)
- Wed86%(22 flights)
- Thu83%(24 flights)
- Fri71%(24 flights)
- Sat82%(17 flights)
- Sun57%(21 flights)
- 12–3 PM—(5 flights)
- 3–6 PM—(5 flights)
- 6–9 PM—(3 flights)
- 9 PM–12 AM78%(144 flights)
Jun 55% → Apr 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 55% | 22 |
| July 2025 | 83% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 90% | 30 |
| January 2026 | 67% | 21 |
| April 2026 | 90% | 10 |
- Departures on time
- 82%
- Diverted
- 0%
- Flights flown
- 157
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 160 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.