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Route on-time record

ORD to MIA: most on-time flights and the best time to fly

Chicago (Chicago O'Hare International Airport) to Miami (Miami International Airport). 4,454 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was American 2984 at 5:00 AM.

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

ORD → MIA

Chicago to Miami: 4,454 nonstop flights a year

On time (12 months)

75%

Cancelled

1.9%

avg delay 18 min

Best time to leave

Before 9 AM

86% on time vs 59% 6 to 9 PM

Most reliable airline

American

75% chance on time

Check ORD to MIA fares

Lowest nonstop fare seen in the next two months: $159 (American 2323 on 2026-10-17). 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 · American 2984

    5:00 AM → 9:12 AM3h 12m nonstop

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

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    1.1%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (360 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Strong track record · 360 flights

    Find American 2984 fares Opens this date on Aviasales

  2. #2 · American 1411

    6:50 AM → 11:07 AM3h 17m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    91%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (48 flights, Jun 2025 to May 2026).
    • Never cancelled in 48 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Limited track record · 48 flights

    Find American 1411 fares Opens this date on Aviasales

  3. #3 · American 1380

    6:08 AM → 10:21 AM3h 13m nonstop

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

    89%

    chance on time

    On time (history)
    91%
    Cancelled
    2.8%
    Avg arrival delay
    5 min
    • Arrived on time 91% of the time (70 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 70 flights

    Find American 1380 fares Opens this date on Aviasales

  4. #4 · American 1164

    6:00 AM → 10:14 AM3h 14m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    86%

    chance on time

    On time (history)
    85%
    Cancelled
    6.9%
    Avg arrival delay
    9 min
    • Arrived on time 85% of the time (27 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (27 flights), so its score leans on the airline's record at this hour.

    Limited track record · 27 flights

    Find American 1164 fares Opens this date on Aviasales

  5. #5 · American 835

    7:00 AM → 11:16 AM3h 16m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1356; its record covers all of them.

    84%

    chance on time

    On time (history)
    85%
    Cancelled
    2.3%
    Avg arrival delay
    7 min
    • Arrived on time 85% of the time (128 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 128 flights

    Find American 835 fares Opens this date on Aviasales

  6. #6 · United 470

    7:00 AM → 11:22 AM3h 22m nonstop

    Local times, typical schedule. Last flown 2026-04-27.

    83%

    chance on time

    On time (history)
    86%
    Cancelled
    4.5%
    Avg arrival delay
    4 min
    • Arrived on time 86% of the time (21 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find United 470 fares Opens this date on Aviasales

  7. #7 · United 1358

    7:30 AM → 11:47 AM3h 23m nonstop

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

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    2.8%
    Avg arrival delay
    10 min
    • Arrived on time 83% of the time (69 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 69 flights

    Find United 1358 fares Opens this date on Aviasales

  8. #8 · American 1089

    9:45 AM → 1:59 PM3h 14m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    79%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 86% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 44 flights

    Find American 1089 fares Opens this date on Aviasales

  9. #9 · American 1250

    8:25 AM → 12:40 PM3h 15m nonstop

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

    79%

    chance on time

    On time (history)
    81%
    Cancelled
    0.5%
    Avg arrival delay
    16 min
    • Arrived on time 81% of the time (180 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 180 flights

    Find American 1250 fares Opens this date on Aviasales

  10. #10 · American 1528

    8:41 AM → 12:55 PM3h 14m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    78%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 73% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 59%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Limited track record · 30 flights

    Find American 1528 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines75%

    3,019 flights · 76% on time as flown · 1.8% cancel

  • United Airlines74%

    1,011 flights · 74% on time as flown · 0.8% cancel

  • Frontier Airlines70%

    46 flights · 64% on time as flown · 1.9% cancel

  • Spirit Airlines62%

    378 flights · 63% on time as flown · 4.7% cancel

On time by departure time

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

  • Before 9 AM86%

    1,762 flights · avg delay 9 min

  • 9 AM to noon72%

    929 flights · avg delay 19 min

  • Noon to 3 PM74%

    559 flights · avg delay 21 min

  • 3 to 6 PM61%

    660 flights · avg delay 28 min

  • 6 to 9 PM59%

    540 flights · avg delay 31 min

Best day: Tuesday (80%). Worst: Sunday (72%).

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
70
F
80
M
71
A
79
M
75
J
73
J
68
A
71
S
84
O
87
N
86
D
73

What delays this route

  • Late-arriving aircraft36%
  • Airline (crew, maintenance, boarding)30%
  • Air traffic control and airport volume28%
  • 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

ORD to MIA questions

What time of day is best to fly ORD to MIA?
Before 9 AM: 86% of flights arrived on time, against 59% 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 ORD to MIA?
American, with a season-adjusted 75% chance of operating and arriving on time over 3,019 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 ORD to MIA?
July (68% on time); the best was October (87%), 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 ORD

Live status: FAA delays and ground stops