Best Time to Fly ATL to MKE: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → General Mitchell International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.3% of Atlanta (ATL) to Milwaukee (MKE) flights arrived on time (2,264 scheduled flights). That is 4.7 points above the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 83.1% on time and Frontier Airlines was last with 52.5%.
Over 24 months, Wednesday was the most reliable day (87% on time) and July the worst month (76%).
The cancellation rate was 1.9% (US average 1.8%).
ATL to MKE 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 | 83.1% | 52 min | 2.0% | 2,202 |
| Frontier Airlines | 52.5% | 44 min | 0.0% | 62 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to MKE
On-time arrival % by scheduled departure hour (local time), 4,648 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 20 | |
| 8am–9am | 91.0% | 1.6% | 760 |
| 9am–10am | 83.5% | 1.1% | 184 |
| 10am–11am | 89.9% | 1.3% | 553 |
| 11am–12pm | 84.9% | 1.9% | 54 |
| 12pm–1pm | 88.9% | 0.3% | 361 |
| 1pm–2pm | 84.9% | 2.1% | 243 |
| 2pm–3pm | 83.2% | 0.7% | 288 |
| 3pm–4pm | 85.0% | 1.4% | 278 |
| 4pm–5pm | 74.3% | 1.8% | 396 |
| 5pm–6pm | 86.4% | 0.0% | 66 |
| 6pm–7pm | 73.3% | 2.8% | 108 |
| 7pm–8pm | 71.7% | 1.1% | 467 |
| 8pm–9pm | 75.5% | 1.4% | 141 |
| 9pm–10pm | Limited data | 9 | |
| 10pm–11pm | 80.0% | 1.6% | 575 |
| 11pm–12am | 70.7% | 2.8% | 145 |
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 MKE
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) | 78.9% | -5.2 pts | 0.0% | 90 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.2% | -3.8 pts | 1.8% | 170 |
| Summer peak (Jun 15 - Aug 15) | 78.7% | -5.3 pts | 1.6% | 815 |
| All other days | 84.0% | — | 1.3% | 3,573 |
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).