Route on-time record

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

Houston (George Bush Intercontinental Airport) to Miami (Miami International Airport). 3,764 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was American 1047 at 5:35 AM.

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

IAH → MIA

Houston to Miami: 3,764 nonstop flights a year

On time (12 months)

78%

Cancelled

1.3%

avg delay 21 min

Best time to leave

Before 9 AM

89% on time vs 66% 3 to 6 PM

Most reliable airline

United

79% chance on time

Check IAH to MIA 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 · American 1047
5:35 AM → 9:09 AM2h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 2144; its record covers all of them.
90%
chance on time
On time (history)
92%
Cancelled
1.6%
Avg arrival delay
9 min
- Arrived on time 92% of the time (359 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 359 flights
Find American 1047 fares Opens this date on Aviasales
#2 · United 1966
7:32 AM → 11:09 AM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
86%
Cancelled
1.0%
Avg arrival delay
9 min
- Arrived on time 86% of the time (100 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 100 flights
Find United 1966 fares Opens this date on Aviasales
#3 · United 410
12:09 PM → 3:47 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
87%
Cancelled
0.0%
Avg arrival delay
7 min
- Arrived on time 87% of the time (164 flights, Jun 2025 to May 2026).
- Never cancelled in 165 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 164 flights
Find United 410 fares Opens this date on Aviasales
#4 · American 1347
7:17 AM → 10:55 AM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
On time (history)
86%
Cancelled
0.8%
Avg arrival delay
22 min
- Arrived on time 86% of the time (356 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 356 flights
Find American 1347 fares Opens this date on Aviasales
#5 · American 3258
10:01 AM → 1:37 PM2h 39m nonstop
Local times, typical schedule. Last flown 2026-04-06.
82%
chance on time
On time (history)
85%
Cancelled
0.7%
Avg arrival delay
23 min
- Arrived on time 85% of the time (134 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 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.
Moderate track record · 134 flights
Find American 3258 fares Opens this date on Aviasales
#6 · American 2145
9:50 AM → 1:27 PM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-20.
81%
chance on time
On time (history)
84%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 84% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 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 2145 fares Opens this date on Aviasales
#7 · United 2852
9:46 AM → 1:24 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-03-28.
80%
chance on time
On time (history)
71%
Cancelled
0.0%
Avg arrival delay
27 min
- Arrived on time 71% of the time (24 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 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.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 2852 fares Opens this date on Aviasales
#8 · United 2740
4:50 PM → 8:33 PM2h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 66% on time; Before 9 AM: 89%).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2740 fares Opens this date on Aviasales
#9 · United 1829
6:50 PM → 10:28 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-30.
76%
chance on time
On time (history)
78%
Cancelled
0.0%
Avg arrival delay
13 min
- Arrived on time 78% of the time (95 flights, Jun 2025 to May 2026).
- Never cancelled in 95 scheduled flights.
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
- 55% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 95 flights
Find United 1829 fares Opens this date on Aviasales
#10 · Spirit 471
11:39 AM → 3:00 PM2h 21m nonstop
Local times, typical schedule. Last flown 2026-05-01.
74%
chance on time
On time (history)
90%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 90% of the time (10 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 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.
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 10 flights
Find Spirit 471 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines79%
1,485 flights · 80% on time as flown · 0.6% cancel
American Airlines78%
1,507 flights · 79% on time as flown · 1.5% cancel
Envoy Air (sold as American Eagle)76%
121 flights · 78% on time as flown · 0.7% cancel
Spirit Airlines70%
497 flights · 71% on time as flown · 2.6% cancel
Frontier Airlines70%
140 flights · 68% on time as flown · 1.3% cancel

On time by departure time

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

Before 9 AM89%
1,175 flights · avg delay 13 min
9 AM to noon79%
607 flights · avg delay 22 min
Noon to 3 PM78%
561 flights · avg delay 14 min
3 to 6 PM66%
574 flights · avg delay 28 min
6 to 9 PM69%
824 flights · avg delay 31 min

Best day: Tuesday (81%). Worst: Sunday (72%).

Smarter routing

Nearby airports that run more on time

IAH → FLL 79% chance on time
George Bush Intercontinental Airport to Fort Lauderdale Hollywood International Airport · 2,840 flights a year · 21 mi from your airports · yours: 77%
Rank flights Fares

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.

What delays this route

Late-arriving aircraft41%
Airline (crew, maintenance, boarding)31%
Air traffic control and airport volume18%
Severe weather9%

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

IAH to MIA questions

What time of day is best to fly IAH to MIA?: Before 9 AM: 89% of flights arrived on time, against 66% 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 IAH to MIA?: United, with a season-adjusted 79% 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 IAH to MIA?: July (67% on time); the best was October (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 IAH

Live status: FAA delays and ground stops

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