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Route on-time record

ATL to MKE: most on-time flights and the best time to fly

Atlanta (Hartsfield Jackson Atlanta International Airport) to Milwaukee (General Mitchell International Airport). 2,262 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was Delta 2999 at 8:05 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ATL → MKE

Atlanta to Milwaukee: 2,262 nonstop flights a year

On time (12 months)

83%

Cancelled

1.9%

avg delay 10 min

Best time to leave

Before 9 AM

90% on time vs 73% 6 to 9 PM

Most reliable airline

Delta

82% chance on time

Check ATL to MKE fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Delta 2999

    8:05 AM → 9:04 AM1h 59m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    89%

    chance on time

    On time (history)
    92%
    Cancelled
    2.8%
    Avg arrival delay
    5 min
    • Arrived on time 92% of the time (344 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 73%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 344 flights

    Find Delta 2999 fares Opens this date on Aviasales

  2. #2 · Delta 1151

    10:42 AM → 11:38 AM2h 02m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    90%
    Cancelled
    1.8%
    Avg arrival delay
    6 min
    • Arrived on time 90% of the time (334 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 334 flights

    Find Delta 1151 fares Opens this date on Aviasales

  3. #3 · Delta 1246

    12:55 PM → 1:52 PM1h 57m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    1.0%
    Avg arrival delay
    6 min
    • Arrived on time 87% of the time (285 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 285 flights

    Find Delta 1246 fares Opens this date on Aviasales

  4. #4 · Delta 1333

    1:54 PM → 2:50 PM1h 56m nonstop

    Local times, typical schedule. Last flown 2026-04-12.

    85%

    chance on time

    On time (history)
    90%
    Cancelled
    9.4%
    Avg arrival delay
    3 min
    • Arrived on time 90% of the time (29 flights, Jun 2025 to May 2026).
    • Cancelled 9.4% of the time (3 of 32).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (29 flights), so its score leans on the airline's record at this hour.

    Limited track record · 29 flights

    Find Delta 1333 fares Opens this date on Aviasales

  5. #5 · Delta 2152

    4:43 PM → 5:41 PM1h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    80%

    chance on time

    On time (history)
    83%
    Cancelled
    3.7%
    Avg arrival delay
    10 min
    • Arrived on time 83% of the time (289 flights, Jun 2025 to May 2026).
    • Cancelled 3.7% of the time (11 of 300).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 289 flights

    Find Delta 2152 fares Opens this date on Aviasales

  6. #6 · Delta 2806

    4:53 PM → 5:51 PM1h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-04.

    79%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 92% of the time (13 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (13 flights), so its score leans on the airline's record at this hour.

    Limited track record · 13 flights

    Find Delta 2806 fares Opens this date on Aviasales

  7. #7 · Delta 1268

    11:00 PM → 11:58 PM2h 01m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    78%

    chance on time

    On time (history)
    79%
    Cancelled
    1.6%
    Avg arrival delay
    15 min
    • Arrived on time 79% of the time (357 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 357 flights

    Find Delta 1268 fares Opens this date on Aviasales

  8. #8 · Delta 2388

    7:59 PM → 9:02 PM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Delta 2430; its record covers all of them.

    73%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 71% of the time (56 flights, Jun 2025 to May 2026).
    • Never cancelled in 56 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 73% on time; Before 9 AM: 90%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Limited track record · 56 flights

    Find Delta 2388 fares Opens this date on Aviasales

  9. #9 · Delta 1206

    7:35 PM → 8:35 PM2h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    71%

    chance on time

    On time (history)
    72%
    Cancelled
    1.6%
    Avg arrival delay
    15 min
    • Arrived on time 72% of the time (315 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 73% on time; Before 9 AM: 90%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 315 flights

    Find Delta 1206 fares Opens this date on Aviasales

  10. #10 · Frontier 4699

    10:09 AM → 11:14 AM2h 08m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    64%

    chance on time

    On time (history)
    54%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 54% of the time (52 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
    • 60% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 52 flights

    Find Frontier 4699 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines82%

    2,209 flights · 83% on time as flown · 2.0% cancel

  • Frontier Airlines69%

    53 flights · 54% on time as flown · 1.4% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM90%

    368 flights · avg delay 5 min

  • 9 AM to noon88%

    357 flights · avg delay 7 min

  • Noon to 3 PM87%

    452 flights · avg delay 7 min

  • 3 to 6 PM79%

    360 flights · avg delay 11 min

  • 6 to 9 PM73%

    360 flights · avg delay 15 min

  • After 9 PM79%

    365 flights · avg delay 15 min

Best day: Wednesday (87%). Worst: Monday (79%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
80
F
84
M
79
A
82
M
79
J
76
J
73
A
80
S
91
O
91
N
90
D
82

What delays this route

  • Airline (crew, maintenance, boarding)51%
  • Late-arriving aircraft26%
  • Air traffic control and airport volume17%
  • Severe weather6%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

ATL to MKE questions

What time of day is best to fly ATL to MKE?
Before 9 AM: 90% of flights arrived on time, against 73% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ATL to MKE?
Delta, with a season-adjusted 82% chance of operating and arriving on time over 2,209 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on ATL to MKE?
July (73% on time); the best was October (91%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from ATL

Live status: FAA delays and ground stops