Flight Reliability
DL 2517 · Delta Air Lines
Detroit → Greenville (DTW–GSP)92% of its flights flew this route. The rest (SAT–ATL) are included in these numbers.
85
Pretty Reliable
WanderNerd Reliability Score
- 80%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 0.5%
- Cancelled
- 4 min early
- Median arrival delay
Based on 188 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
DL 2517 departing between 3–6 PM arrived on time 92% of the time, versus 76% between 6–9 PM.
Sunday scaries are real for this one.
DL 2517 arrived on time 93% of the time on Mondays and just 65% on Sundays. That gap is worth planning around.
A bit ahead of the DTW–GSP route.
DL 2517 arrived on time 80% of the time, versus 75% across the DTW–GSP route.
The breakdown
- Mon93%(27 flights)
- Tue81%(31 flights)
- Wed81%(31 flights)
- Thu80%(25 flights)
- Fri71%(24 flights)
- Sat87%(23 flights)
- Sun65%(26 flights)
- 3–6 PM92%(47 flights)
- 6–9 PM76%(140 flights)
90%
Mar
Jun 65% → Mar 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 65% | 23 |
| July 2025 | 73% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 79% | 24 |
| November 2025 | 88% | 17 |
| December 2025 | 71% | 17 |
| March 2026 | 90% | 10 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 187
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 188 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.