Carrier route record

MQMIA→IAH

Envoy Air · Miami to Houston

Flights: 122
Period: July 2025 to June 2026
Share of route: 3%
Carriers: 6

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Envoy Air.

Envoy on MIA to IAH earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 40 minutes. That rests on 122 flights. The strongest carrier on the route with a full sample, United Airlines, flew 1,479 at 85.9% on time.

Set against the rest of the country, Envoy's MIA to IAH record is 9 points better than the US average of 77.6%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.

On time

86.9%

Arrivals under 15 minutes late, of 122 completed flights

Avg delay

39 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

77.2%

Every carrier on MIA to IAH, 3,737 flights

These figures cover 122 flights between July 2025 and June 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Envoy against every carrier on MIA to IAH

Envoy flew 122 of the 3,737 flights on MIA to IAH, about 3% of it. Its 86.9% on time is 10 points better than the route as a whole, which runs 77.2%. Ranked by on-time rate it is first of six carriers on the route, where the range runs from Envoy at 86.9% to Republic at 64.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 85.9% of the time; Spirit Airlines manages 69.7%. Sample sizes sit next to every figure, because a two-point gap across 440 flights means less than a ten-point one.

On-time performance by carrier on MIA to IAH
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Air (this page)thin sample	122	86.9%	39 min	0.00%	A+
United Airlines	1,479	85.9%	91 min	0.61%	A+
Frontier Airlinesthin sample	155	78.4%	97 min	1.29%	B
American Airlines	1,527	70.1%	72 min	1.24%	C
Spirit Airlines	440	69.7%	87 min	2.73%	C
Republic Airwaysthin sample	14	64.3%	133 min	0.00%	D+

The spread between United and Spirit is 16 points, wide enough that it should decide the booking. On a hundred trips that is 16 more arrivals inside the on-time window.

Departure window

When Envoy runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against 16 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am36 flights97.2%
11am–2pm23 flights—
2pm–5pm63 flights85.7%
5pm–8pm—
8pm–5am—

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 97.2% of the time, against 85.7% for the afternoon window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 63 flights scheduled in it.

Across the year

Envoy on MIA to IAH through the year

Jul–Sep 202529 flights—
Oct–Dec 202559 flights89.8%
Jan–Mar 202616 flights—
Apr–Jun 202618 flights—

Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 86.9% on time across 122 flights.

Split by quarter, Envoy on MIA to IAH logged 29 flights in Jul–Sep 2025, 59 flights in Oct–Dec 2025, 16 flights in Jan–Mar 2026 and 18 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 86.9% annual figure is the one to use.

Delay causes

Why Envoy runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 624 reported delay minutes.

National Airspace System
32%
Late-arriving aircraft
29%
Carrier
26%
Security
12%
Extreme weather
1%

The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 97.2% on time here. The split is drawn from 624 reported delay minutes.

No single cause dominates. national airspace system at 32%, late-arriving aircraft at 29% and carrier at 26% split the 624 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 3.3% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 964 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 78.5% on time across 122 flights, 8 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 8 points of difference.

One caution: this is a thin sample. 122 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking Envoy on MIA to IAH

Put together: treat all of this as provisional. 122 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 86.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 122 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures