Carrier performance at one airport
OO→IAH
SkyWest Airlines at George Bush Intercontinental
- Departures
- 14,441
- Period
- June 2025 to May 2026
- Routes
- 25
- Rank here
- #5 of 10
SkyWest Airlines at Houston lands a B, about a point worse than the national rate of 77.4%. About one flight in four arrive 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 14,441 flights, of which Delta Air Lines flew 8,344 at 80.3% on time.
Measured against the airport rather than the country, SkyWest Airlines runs 2 points behind the 78.0% weighted average across all carriers at IAH. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
76.2%
14,156 completed departures
Avg delay
94 min
Across delayed flights only
Cancelled
1.45%
At IAH, this carrier only
Rank here
#5
Of 10 carriers clearing the floor at IAH
These figures cover 14,000 flights between June 2025 and May 2026. Beyond the headline rate, 10.8% 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.
Against the competition
Every carrier at IAH, ranked
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 80.3% of the time; JetBlue Airways manages 60.3%. Sample sizes sit next to every figure, because a two-point gap across 493 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 8,344 | 80.3% | 86 min | 1.89% | B |
| United Airlines | 73,829 | 79.3% | 67 min | 0.80% | B+ |
| Alaska Airlines | 1,208 | 77.2% | 56 min | 1.16% | B |
| American Airlines | 7,653 | 76.8% | 132 min | 2.61% | B |
| SkyWest Airlines (this page) | 14,441 | 76.2% | 94 min | 1.45% | B |
| Envoy Air | 1,489 | 76.1% | 80 min | 2.42% | B |
| Republic Airways | 874 | 74.2% | 74 min | 3.89% | C− |
| Spirit Airlines | 6,056 | 74.0% | 74 min | 2.77% | C |
| Frontier Airlines | 4,514 | 69.1% | 89 min | 1.71% | C |
| JetBlue Airways | 493 | 60.3% | 80 min | 2.23% | D |
Republic Airways cancels 3.9% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Where SkyWest Airlines flies from IAH
SkyWest Airlines operates 25 routes out of IAH with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| IAH to SHV · Shreveport | 1,229 | 74.2% | 81 min | 1.95% | C |
| IAH to OKC · Oklahoma City | 1,195 | 77.0% | 90 min | 1.34% | B |
| IAH to TUL · Tulsa | 796 | 82.7% | 80 min | 0.38% | B+ |
| IAH to MEM · Memphis | 742 | 81.5% | 70 min | 0.67% | B+ |
| IAH to CRP · Corpus Christi | 601 | 78.9% | 107 min | 2.00% | B |
| IAH to LIT · Little Rock | 599 | 76.4% | 71 min | 0.67% | B+ |
| IAH to ASE · Aspen | 598 | 75.9% | 84 min | 3.34% | B− |
| IAH to MAF · Midland | 509 | 77.5% | 78 min | 1.18% | B |
| IAH to BTR · Baton Rouge | 495 | 79.0% | 65 min | 1.01% | B |
| IAH to ICT · Wichita | 445 | 82.8% | 101 min | 1.57% | B |
| IAH to LAX · Los Angeles | 409 | 78.8% | 77 min | 0.49% | B+ |
| IAH to BNA · Nashville | 396 | 68.3% | 78 min | 1.26% | C |
| IAH to LFT · Lafayette | 366 | 74.3% | 116 min | 2.19% | C |
| IAH to SLN · Salinathin sample | 344 | 72.2% | 124 min | 1.45% | C |
| IAH to COS · Colorado Springsthin sample | 282 | 75.6% | 75 min | 1.06% | B |
| IAH to LBB · Lubbockthin sample | 250 | 72.8% | 102 min | 3.20% | C− |
| IAH to MFE · McAllenthin sample | 228 | 75.9% | 94 min | 1.32% | B |
| IAH to MKE · Milwaukeethin sample | 193 | 80.3% | 53 min | 0.00% | B+ |
| IAH to PHX · Phoenixthin sample | 182 | 69.5% | 75 min | 2.75% | C |
| IAH to PNS · Pensacolathin sample | 163 | 65.6% | 82 min | 0.00% | C+ |
| IAH to SGF · Springfieldthin sample | 163 | 69.6% | 151 min | 2.45% | C |
| IAH to BHM · Birminghamthin sample | 140 | 73.7% | 88 min | 2.14% | C |
| IAH to XNA · Bentonvillethin sample | 128 | 80.2% | 66 min | 1.56% | B |
| IAH to AMA · Amarillothin sample | 127 | 85.6% | 82 min | 1.57% | A |
| IAH to CHA · Chattanoogathin sample | 126 | 66.7% | 112 min | 0.00% | C+ |
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against 20 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,169 flights84.0%
- 8am–11am1,627 flights75.4%
- 11am–2pm2,945 flights77.5%
- 2pm–5pm3,275 flights75.9%
- 5pm–8pm2,723 flights72.7%
- 8pm–5am2,702 flights75.8%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 84.0% of the time, against 72.7% for the evening window. That is 11 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.
Across the year
Seasonal pattern
June is the worst month at 62.4% on time, 26 points below September, the best at 88.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck.
Delay causes
What holds this operation up
- 42%Carrier
- 34%Late-arriving aircraft
- 13%National Airspace System
- 12%Extreme weather
- 0%Security
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure.
Cancellations sit at 1.45% against a national 1.80%, which is ordinary. Diversions add another 0.52%.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.8% of arrivals land a full hour or more behind schedule, against 8.2% 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.
14,441 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 88.2% on time and June 62.4%, a swing of 26 points. If the dates move at all, move them out of June before you think about anything else.
Common questions
SkyWest Airlines at IAH
How often is SkyWest Airlines at IAH delayed?
About one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 23.8% of the 14,441 flights in this analysis, against 22.6% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on SkyWest Airlines at IAH?
Delta Air Lines leads at 80.3% on time across 8,344 flights. JetBlue Airways is at the other end on 60.3%, a gap of 20 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on SkyWest Airlines at IAH?
The 5am–8am departure window is the strongest at 84.0% on time. The 5pm–8pm window is the weakest at 72.7%, 11 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are June delays on SkyWest Airlines at IAH?
June is the weakest month at 62.4% on time, compared with 88.2% in September. Across the year that is 26 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.