Best Time to Fly GSP to DTW: On-Time Stats by Hour & Airline
Greenville-Spartanburg International → Detroit Metro Wayne County
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 87.3% of Greer (GSP) to Detroit (DTW) flights arrived on time (550 scheduled flights). That is 9.7 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 90.8%, while SkyWest Airlines trailed at 78.4%.
October has been the best month (96% on time) and Monday the weakest day of the week (82%).
2.7% of flights were cancelled, versus 1.8% nationally.
GSP to DTW on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 90.8% | 69 min | 2.5% | 392 |
| SkyWest Airlines | 78.4% | 136 min | 3.2% | 158 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GSP to DTW
On-time arrival % by scheduled departure hour (local time), 1,143 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 90.3% | 1.6% | 63 |
| 7am–8am | 94.3% | 1.9% | 471 |
| 11am–12pm | 82.7% | 0.0% | 150 |
| 12pm–1pm | 84.4% | 0.0% | 122 |
| 1pm–2pm | 100.0% | 0.0% | 33 |
| 5pm–6pm | 75.7% | 0.0% | 74 |
| 6pm–7pm | 75.8% | 3.0% | 230 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GSP to DTW
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 29 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 92.0% | +4.3 pts | 2.0% | 51 |
| Summer peak (Jun 15 - Aug 15) | 82.9% | -4.8 pts | 0.8% | 243 |
| All other days | 87.7% | — | 1.5% | 820 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).