Best Time to Fly MDT to ATL: On-Time Stats by Hour & Airline
Harrisburg International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.9% of Harrisburg (MDT) to Atlanta (ATL) flights arrived on time (1,002 scheduled flights). That is 8.2 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
September has been the best month (91% on time) and Sunday the weakest day of the week (79%).
2.4% of flights were cancelled, versus 1.8% nationally.
MDT to ATL 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 | 85.9% | 81 min | 2.4% | 1,002 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDT to ATL
On-time arrival % by scheduled departure hour (local time), 1,990 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 89.9% | 2.0% | 710 |
| 11am–12pm | 86.6% | 0.8% | 257 |
| 12pm–1pm | 82.3% | 0.9% | 212 |
| 1pm–2pm | 80.4% | 1.9% | 156 |
| 2pm–3pm | 81.4% | 1.6% | 63 |
| 3pm–4pm | Limited data | 7 | |
| 4pm–5pm | Limited data | 5 | |
| 5pm–6pm | 82.4% | 1.1% | 93 |
| 6pm–7pm | 81.0% | 1.6% | 452 |
| 7pm–8pm | 73.5% | 2.9% | 35 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDT to ATL
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) | 77.8% | -8.7 pts | 0.0% | 36 |
| Christmas & New Year (Dec 20 - Jan 3) | 64.7% | -21.7 pts | 0.0% | 34 |
| Summer peak (Jun 15 - Aug 15) | 81.7% | -4.7 pts | 1.9% | 379 |
| All other days | 86.4% | — | 1.6% | 1,541 |
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).