Atlanta (ATL) to Milwaukee (MKE): On-Time Performance
Data through July 2026
When you fly ATL to MKE matters as much as anything else about the booking: the route swung from 92% on-time in September 2024 to just 67% in July 2024. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 75%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 6.2
- last 12 months
- Duration
- 1h 59m
- scheduled
- Distance
- 669 mi
Best airline from ATL to MKE
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 89% | 7 min | 0.4% | 280 |
| Delta Air Lines | 82% | 11 min | 1.7% | 4,533 |
| Frontier Airlines | 52% | 21 min | 0.0% | 62 |
Monthly on-time trend
Best time to fly from ATL to MKE
Aim for departures around 8 a.m. (90% on-time); avoid 11 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 12 min |
| Tuesdaybest | 86% | 8 min |
| Wednesday | 86% | 7 min |
| Thursday | 82% | 10 min |
| Friday | 80% | 12 min |
| Saturday | 84% | 10 min |
| Sunday | 77% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft26%
- Airline operations52%
- National airspace system17%
- Weather5%
Frequently asked questions
- How often are flights from ATL to MKE delayed?
- 18% of ATL–MKE flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 11 minutes.
- Which airline is most reliable from ATL to MKE?
- Southwest Airlines has the best on-time record on this route at 89%, based on 280 flights. 3 airlines flew ATL–MKE frequently enough to compare in this period.
- What is the best time of day to fly from ATL to MKE?
- Departures around 8 a.m. have the best record (90% on-time), while departures around 11 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to MKE?
- The scheduled ATL–MKE flight time averages 1h 59m over 669 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are ATL to MKE flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to MKE?
- July 2024 was the roughest month in this dataset, with only 67% of arrivals on time. The best was September 2024 at 92%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 4,875 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.