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Route on-time record

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

Miami (Miami International Airport) to Chicago (Chicago O'Hare International Airport). 4,451 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 1.8% were cancelled. The most reliable flight number was American 1431 at 8:15 AM.

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

MIA → ORD

Miami to Chicago: 4,451 nonstop flights a year

On time (12 months)

71%

Cancelled

1.8%

avg delay 23 min

Best time to leave

Before 9 AM

87% on time vs 56% 3 to 6 PM

Most reliable airline

United

71% chance on time

Check MIA to ORD 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 · American 1431

    8:15 AM → 10:47 AM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1925; its record covers all of them.

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.5%
    Avg arrival delay
    16 min
    • Arrived on time 87% of the time (194 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 56%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • 55% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 194 flights

    Find American 1431 fares Opens this date on Aviasales

  2. #2 · United 2384

    8:55 AM → 11:31 AM3h 36m nonstop

    Local times, typical schedule. Last flown 2026-04-27. Same departure also flew as United 1314; its record covers all of them.

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    25 min
    • Arrived on time 87% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 56%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Limited track record · 46 flights

    Find United 2384 fares Opens this date on Aviasales

  3. #3 · American 1486

    9:40 AM → 12:11 PM3h 31m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as American 3024; its record covers all of them.

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (72 flights, Jun 2025 to May 2026).
    • Never cancelled in 74 scheduled flights.
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Moderate track record · 72 flights

    Find American 1486 fares Opens this date on Aviasales

  4. #4 · American 1269

    8:30 AM → 11:04 AM3h 34m nonstop

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

    82%

    chance on time

    On time (history)
    86%
    Cancelled
    2.3%
    Avg arrival delay
    12 min
    • Arrived on time 86% of the time (43 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 56%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Short track record (43 flights), so its score leans on the airline's record at this hour.

    Limited track record · 43 flights

    Find American 1269 fares Opens this date on Aviasales

  5. #5 · American 1624

    6:19 AM → 8:53 AM3h 34m nonstop

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

    82%

    chance on time

    On time (history)
    79%
    Cancelled
    3.3%
    Avg arrival delay
    13 min
    • Arrived on time 79% of the time (28 flights, Jun 2025 to May 2026).
    • Cancelled 3.3% of the time (1 of 30).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 56%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Limited track record · 28 flights

    Find American 1624 fares Opens this date on Aviasales

  6. #6 · American 581

    10:45 AM → 9:10 AM3h 31m nonstop

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

    82%

    chance on time

    On time (history)
    85%
    Cancelled
    0.6%
    Avg arrival delay
    9 min
    • Arrived on time 85% of the time (176 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Moderate track record · 176 flights

    Find American 581 fares Opens this date on Aviasales

  7. #7 · American 2586

    12:00 PM → 2:39 PM3h 38m nonstop

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

    80%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 93% of the time (14 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 73% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 14 flights

    Find American 2586 fares Opens this date on Aviasales

  8. #8 · American 2910

    12:20 PM → 2:57 PM3h 37m nonstop

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

    79%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find American 2910 fares Opens this date on Aviasales

  9. #9 · United 1983

    12:10 PM → 2:50 PM3h 43m nonstop

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

    78%

    chance on time

    On time (history)
    79%
    Cancelled
    0.3%
    Avg arrival delay
    20 min
    • Arrived on time 79% of the time (297 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 297 flights

    Find United 1983 fares Opens this date on Aviasales

  10. #10 · United 1642

    12:24 PM → 3:03 PM3h 39m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    76%

    chance on time

    On time (history)
    80%
    Cancelled
    3.1%
    Avg arrival delay
    33 min
    • Arrived on time 80% of the time (30 flights, Jun 2025 to May 2026).
    • Cancelled 3.1% of the time (1 of 32).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 30 flights

    Find United 1642 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines71%

    1,010 flights · 71% on time as flown · 0.9% cancel

  • Frontier Airlines71%

    46 flights · 73% on time as flown · 1.9% cancel

  • American Airlines70%

    3,019 flights · 71% on time as flown · 1.7% cancel

  • Spirit Airlines63%

    376 flights · 64% on time as flown · 4.5% cancel

On time by departure time

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

  • Before 9 AM87%

    914 flights · avg delay 10 min

  • 9 AM to noon84%

    426 flights · avg delay 14 min

  • Noon to 3 PM76%

    843 flights · avg delay 23 min

  • 3 to 6 PM56%

    1,229 flights · avg delay 34 min

  • 6 to 9 PM59%

    665 flights · avg delay 28 min

  • After 9 PM73%

    374 flights · avg delay 20 min

Best day: Tuesday (80%). Worst: Sunday (68%).

Smarter routing

Nearby airports that run more on time

  • MIA → MDW 72% chance on time

    Miami International Airport to Chicago Midway International Airport · 520 flights a year · 15 mi from your airports · yours: 70%

    Rank flightsFares

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
76
F
78
M
70
A
78
M
71
J
67
J
64
A
66
S
76
O
84
N
85
D
77

What delays this route

  • Air traffic control and airport volume35%
  • Late-arriving aircraft33%
  • Airline (crew, maintenance, boarding)25%
  • Severe weather8%

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

MIA to ORD questions

What time of day is best to fly MIA to ORD?
Before 9 AM: 87% of flights arrived on time, against 56% for departures 3 to 6 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 MIA to ORD?
United, with a season-adjusted 71% chance of operating and arriving on time over 1,010 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 MIA to ORD?
July (64% on time); the best was November (85%), 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 MIA

Live status: FAA delays and ground stops