Atlanta (ATL) to Milwaukee (MKE): On-Time Performance
Data through May 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 83% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 76%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 6.2
- last 12 months
- Duration
- 1h 59m
- scheduled
- Distance
- 669 mi
Best airline from ATL to MKE
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 88% | 7 min | 0.3% | 311 |
| Delta Air Lines | 83% | 10 min | 1.6% | 4,327 |
Monthly on-time trend
Best time to fly from ATL to MKE
Aim for departures around 10 a.m. (90% on-time); avoid 11 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 13 min |
| Tuesday | 86% | 8 min |
| Wednesdaybest | 87% | 7 min |
| Thursday | 82% | 10 min |
| Friday | 81% | 11 min |
| Saturday | 85% | 9 min |
| Sunday | 79% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft24%
- Airline operations54%
- National airspace system17%
- Weather5%
Frequently asked questions
- How often are flights from ATL to MKE delayed?
- 17% of ATL–MKE flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 10 minutes.
- Which airline is most reliable from ATL to MKE?
- Southwest Airlines has the best on-time record on this route at 88%, based on 311 flights. 2 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 10 a.m. have the best record (90% on-time), while departures around 11 p.m. have the worst (64%). 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 17% of the time.
- How often are ATL to MKE flights cancelled?
- 1.5% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, 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 4,691 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.