Carrier route record

OOIAH→PHX

SkyWest Airlines · Houston to Phoenix

Flights: 180
Period: July 2025 to June 2026
Share of route: 6%
Carriers: 5

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

SkyWest on IAH to PHX sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 180 flights. The strongest carrier on the route with a full sample, American Airlines, flew 622 at 81.6% on time.

The national on-time rate over the same period is 77.6%, so SkyWest on IAH to PHX runs 8 points behind the country as a whole. Across a thousand flights that is about 79 extra late arrivals.

On time

69.7%

Arrivals under 15 minutes late, of 175 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

2.78%

National rate is 1.81%

Whole route

78.7%

Every carrier on IAH to PHX, 2,930 flights

These figures cover 180 flights between July 2025 and June 2026. Beyond the headline rate, 12.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

SkyWest against every carrier on IAH to PHX

SkyWest flew 180 of the 2,930 flights on IAH to PHX, about 6% of it. Its 69.7% on time is 9 points worse than the route as a whole, which runs 78.7%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Envoy at 83.3% to Frontier at 68.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on IAH to PHX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	67	83.3%	98 min	1.49%	B
American Airlines	622	81.6%	168 min	1.45%	B
United Airlines	1,784	80.0%	64 min	0.34%	B+
SkyWest Airlines (this page)thin sample	180	69.7%	76 min	2.78%	C
Frontier Airlinesthin sample	277	68.5%	74 min	1.08%	C

No carrier stands out. American tops the table at 81.6%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am1 flights—
11am–2pm—
2pm–5pm77 flights77.0%
5pm–8pm102 flights64.0%
8pm–5am—

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 64.0% on time, against 77.0% for the 2pm–5pm slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 102 flights scheduled in it.

Across the year

SkyWest on IAH to PHX through the year

Oct–Dec 202523 flights—
Jan–Mar 202699 flights72.6%
Apr–Jun 202658 flights59.6%

Scale runs 50% to 80%. 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 69.7% on time across 180 flights.

Split by quarter, SkyWest on IAH to PHX logged 23 flights in Oct–Dec 2025, 99 flights in Jan–Mar 2026 and 58 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 69.7% annual figure is the one to use.

Delay causes

Why SkyWest 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 3,999 reported delay minutes.

Late-arriving aircraft
38%
Carrier
34%
National Airspace System
21%
Extreme weather
8%

38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,999 reported delay minutes here, that single category outweighs weather by 5 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,999 reported delay minutes.

Cancellations run at 2.78%, against 1.81% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 1,009 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 runs 72.6% on time across 180 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 180 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 SkyWest on IAH to PHX

Put together: treat all of this as provisional. 180 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 69.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 175 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