Best Time to Fly ATL to MDT: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Harrisburg International
Data through July 2026 · Last updated October 18, 2026
1,002 flights were scheduled from Atlanta (ATL) to Harrisburg (MDT) in the last 12 months, and 81.2% of those that flew arrived on time, 3.6 points above the US average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
October has been the best month (90% on time) and Friday the weakest day of the week (79%).
2.2% of flights were cancelled, versus 1.8% nationally.
ATL to MDT 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 | 81.2% | 61 min | 2.2% | 1,002 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to MDT
On-time arrival % by scheduled departure hour (local time), 1,990 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 19 | |
| 9am–10am | 87.1% | 0.7% | 439 |
| 10am–11am | 87.0% | 1.5% | 133 |
| 11am–12pm | 89.2% | 2.4% | 85 |
| 12pm–1pm | Limited data | 21 | |
| 2pm–3pm | Limited data | 5 | |
| 3pm–4pm | 82.1% | 1.5% | 544 |
| 4pm–5pm | 70.6% | 2.9% | 35 |
| 7pm–8pm | 93.3% | 0.0% | 30 |
| 8pm–9pm | 85.9% | 1.5% | 65 |
| 9pm–10pm | 78.1% | 1.6% | 487 |
| 10pm–11pm | 81.2% | 1.6% | 126 |
| 11pm–12am | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL to MDT
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) | 80.6% | -4.2 pts | 0.0% | 36 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.8% | -3.0 pts | 0.0% | 33 |
| Summer peak (Jun 15 - Aug 15) | 74.7% | -10.1 pts | 1.9% | 379 |
| All other days | 84.8% | — | 1.4% | 1,542 |
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).