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Route on-time record

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

Miami (Miami International Airport) to Houston (George Bush Intercontinental Airport). 3,764 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was United 2074 at 6:15 AM.

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

MIA → IAH

Miami to Houston: 3,764 nonstop flights a year

On time (12 months)

76%

Cancelled

1.3%

avg delay 20 min

Best time to leave

Before 9 AM

91% on time vs 65% 6 to 9 PM

Most reliable airline

United

84% chance on time

Check MIA to IAH fares

Lowest nonstop fare seen in the next two months: $35 (Frontier 1067 on 2026-11-23). 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 · United 2074

    6:15 AM → 8:21 AM3h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 393; its record covers all of them.

    94%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 95% of the time (94 flights, Jun 2025 to May 2026).
    • Never cancelled in 94 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
    • 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 · 94 flights

    Find United 2074 fares Opens this date on Aviasales

  2. #2 · United 729

    9:00 AM → 11:06 AM3h 06m nonstop

    Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as United 2385; its record covers all of them.

    92%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 94% of the time (133 flights, Jun 2025 to May 2026).
    • Never cancelled in 133 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 · 133 flights

    Find United 729 fares Opens this date on Aviasales

  3. #3 · United 2417

    8:48 AM → 10:42 AM2h 54m nonstop

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

    90%

    chance on time

    On time (history)
    88%
    Cancelled
    11.1%
    Avg arrival delay
    4 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
    • 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 (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find United 2417 fares Opens this date on Aviasales

  4. #4 · United 1743

    10:50 AM → 12:56 PM3h 06m nonstop

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

    89%

    chance on time

    On time (history)
    93%
    Cancelled
    1.0%
    Avg arrival delay
    5 min
    • Arrived on time 93% of the time (97 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 IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 97 flights

    Find United 1743 fares Opens this date on Aviasales

  5. #5 · American 603

    7:02 AM → 8:54 AM2h 52m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 2145, 3258; its record covers all of them.

    87%

    chance on time

    On time (history)
    90%
    Cancelled
    0.5%
    Avg arrival delay
    7 min
    • Arrived on time 90% of the time (188 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
    • 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 · 188 flights

    Find American 603 fares Opens this date on Aviasales

  6. #6 · United 2227

    10:22 AM → 12:34 PM3h 12m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    87%

    chance on time

    On time (history)
    87%
    Cancelled
    4.2%
    Avg arrival delay
    20 min
    • Arrived on time 87% of the time (23 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 IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find United 2227 fares Opens this date on Aviasales

  7. #7 · United 470

    12:50 PM → 2:57 PM3h 07m nonstop

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

    84%

    chance on time

    On time (history)
    83%
    Cancelled
    0.9%
    Avg arrival delay
    22 min
    • Arrived on time 83% of the time (107 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 IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 107 flights

    Find United 470 fares Opens this date on Aviasales

  8. #8 · Spirit 265

    6:30 AM → 8:23 AM2h 53m nonstop

    Local times, typical schedule. Last flown 2026-05-01.

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 83% of the time (12 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
    • 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 (12 flights), so its score leans on the airline's record at this hour.

    Limited track record · 12 flights

    Find Spirit 265 fares Opens this date on Aviasales

  9. #9 · American 1918

    8:41 AM → 10:29 AM2h 48m nonstop

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

    80%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 65%).
    • 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 (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find American 1918 fares Opens this date on Aviasales

  10. #10 · Envoy 4227 · sold as American Eagle

    2:44 PM → 4:42 PM2h 58m nonstop

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

    80%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
    • Departs inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find 2:44 PM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines84%

    1,485 flights · 85% on time as flown · 0.8% cancel

  • Envoy Air (sold as American Eagle)81%

    121 flights · 87% on time as flown · 0.7% cancel

  • Frontier Airlines73%

    141 flights · 73% on time as flown · 1.7% cancel

  • Spirit Airlines69%

    495 flights · 70% on time as flown · 2.3% cancel

  • American Airlines69%

    1,508 flights · 70% on time as flown · 1.4% cancel

On time by departure time

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

  • Before 9 AM91%

    951 flights · avg delay 8 min

  • 9 AM to noon86%

    426 flights · avg delay 12 min

  • Noon to 3 PM78%

    587 flights · avg delay 21 min

  • 3 to 6 PM65%

    824 flights · avg delay 31 min

  • 6 to 9 PM65%

    484 flights · avg delay 27 min

  • After 9 PM68%

    492 flights · avg delay 26 min

Best day: Tuesday (78%). Worst: Sunday (68%).

Smarter routing

Nearby airports that run more on time

  • FLL → IAH 81% chance on time

    Fort Lauderdale Hollywood International Airport to George Bush Intercontinental Airport · 2,836 flights a year · 21 mi from your airports · yours: 75%

    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
73
F
78
M
67
A
80
M
65
J
63
J
66
A
70
S
76
O
82
N
83
D
76

What delays this route

  • Late-arriving aircraft34%
  • Airline (crew, maintenance, boarding)31%
  • Air traffic control and airport volume29%
  • Severe weather5%

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 IAH questions

What time of day is best to fly MIA to IAH?
Before 9 AM: 91% of flights arrived on time, against 65% 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 MIA to IAH?
United, with a season-adjusted 84% chance of operating and arriving on time over 1,485 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 IAH?
June (63% on time); the best was November (83%), 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