Carrier performance at one airport
OO→IAH
SkyWest Airlines at George Bush Intercontinental
- Departures
- 14,187
- Period
- September 2025 to August 2026
- Routes
- 25
- Rank here
- #5 of 11
SkyWest Airlines at Houston lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 14,187 flights, of which Delta Air Lines flew 8,429 at 81.0% on time.
Measured against the airport rather than the country, SkyWest Airlines runs about a point behind the 79.1% 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
77.8%
13,980 completed departures
Avg delay
94 min
Across delayed flights only
Cancelled
1.02%
At IAH, this carrier only
Rank here
#5
Of 11 carriers clearing the floor at IAH
These figures cover 14,000 flights between September 2025 and August 2026. Beyond the headline rate, 9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Against the competition
Every carrier at IAH, ranked
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 81.0% of the time; JetBlue Airways manages 50.5%. Sample sizes sit next to every figure, because a two-point gap across 835 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 8,429 | 81.0% | 83 min | 1.90% | B |
| Alaska Airlines | 1,195 | 80.6% | 55 min | 0.67% | B+ |
| United Airlines | 74,201 | 80.6% | 63 min | 0.55% | B+ |
| Envoy Air | 1,270 | 78.0% | 91 min | 1.81% | B |
| SkyWest Airlines (this page) | 14,187 | 77.8% | 94 min | 1.02% | B |
| American Airlines | 7,927 | 77.5% | 122 min | 2.35% | B |
| Republic Airways | 873 | 74.8% | 79 min | 4.12% | C− |
| Spirit Airlines | 4,114 | 74.5% | 73 min | 3.23% | C− |
| Frontier Airlines | 5,339 | 70.9% | 86 min | 2.38% | C |
| PSA Airlines | 566 | 68.1% | 123 min | 6.89% | C− |
| JetBlue Airways | 835 | 50.5% | 103 min | 4.79% | F− |
PSA Airlines cancels 6.9% 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 | 1,191 | 75.6% | 91 min | 1.09% | B |
| IAH to OKC · Oklahoma City | 890 | 80.0% | 89 min | 1.12% | B |
| IAH to TUL · Tulsa | 772 | 84.3% | 69 min | 0.26% | B+ |
| IAH to MEM · Memphis | 719 | 84.7% | 68 min | 0.97% | B+ |
| IAH to ASE · Aspen | 638 | 76.7% | 91 min | 2.66% | B |
| IAH to LIT · Little Rock | 632 | 77.9% | 75 min | 0.47% | B+ |
| IAH to CRP · Corpus Christi | 507 | 82.2% | 83 min | 1.38% | B |
| IAH to BTR · Baton Rouge | 439 | 80.7% | 61 min | 0.68% | B+ |
| IAH to LAX · Los Angeles | 408 | 79.3% | 77 min | 0.49% | B+ |
| IAH to BNA · Nashville | 376 | 69.9% | 75 min | 0.80% | C+ |
| IAH to ICT · Wichitathin sample | 356 | 82.1% | 83 min | 1.40% | B |
| IAH to MFE · McAllenthin sample | 329 | 75.7% | 118 min | 0.91% | B+ |
| IAH to SLN · Salinathin sample | 318 | 77.8% | 121 min | 0.63% | B+ |
| IAH to CHA · Chattanoogathin sample | 310 | 68.9% | 111 min | 0.00% | C+ |
| IAH to MGM · Montgomerythin sample | 294 | 75.3% | 83 min | 0.00% | B+ |
| IAH to LFT · Lafayettethin sample | 282 | 76.1% | 135 min | 2.13% | B |
| IAH to MAF · Midlandthin sample | 268 | 83.2% | 65 min | 0.00% | B+ |
| IAH to COS · Colorado Springsthin sample | 236 | 78.3% | 78 min | 0.42% | B+ |
| IAH to MKE · Milwaukeethin sample | 236 | 75.7% | 54 min | 0.00% | B+ |
| IAH to AEX · Alexandriathin sample | 206 | 78.9% | 88 min | 0.49% | B+ |
| IAH to PHX · Phoenixthin sample | 185 | 68.3% | 73 min | 2.70% | C |
| IAH to XNA · Bentonvillethin sample | 183 | 76.1% | 65 min | 1.64% | B |
| IAH to PAH · Paducahthin sample | 175 | 76.4% | 177 min | 0.57% | B+ |
| IAH to ABI · Abilenethin sample | 168 | 81.5% | 61 min | 0.00% | B+ |
| IAH to LBB · Lubbockthin sample | 164 | 77.4% | 92 min | 2.44% | B |
Flight by flight
SkyWest Airlines flight numbers from IAH
5 SkyWest Airlines flight numbers leaving IAH flew their main route often enough to have a record of their own. Grouped by destination.
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 31 points between the best and worst carrier.
- 5am–8am1,047 flights85.3%
- 8am–11am1,688 flights74.0%
- 11am–2pm2,984 flights79.5%
- 2pm–5pm2,988 flights79.0%
- 5pm–8pm2,900 flights74.3%
- 8pm–5am2,580 flights77.6%
Scale runs 65% to 90%.
Book the early departure. Flights leaving between 5am–8am arrive on time 85.3% of the time, against 74.0% for the morning 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. The 2pm–5pm window is the busiest, with 2,988 flights scheduled in it.
Across the year
Seasonal pattern
June is the worst month at 68.4% on time, 20 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. August was the busiest month here, with 1,417 flights.
Delay causes
What holds this operation up
- 49%Carrier
- 31%Late-arriving aircraft
- 11%National Airspace System
- 10%Extreme weather
- 0%Security
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 142,000 of the 291,000 delay minutes reported here. The split is drawn from 291,258 reported delay minutes.
Cancellations sit at 1.02% against a national 1.89%, which is ordinary. Diversions add another 0.44%.
9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
14,187 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 68.4%, a swing of 20 points. If the dates move at all, move them out of June before you think about anything else. 13,980 completed flights over 12 months sit behind that.
Common questions
SkyWest Airlines at IAH
How often is SkyWest Airlines at IAH delayed?
Roughly one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.2% of the 14,187 flights in this analysis, against 22.7% 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 81.0% on time across 8,429 flights. JetBlue Airways is at the other end on 50.5%, a gap of 31 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 85.3% on time. The 8am–11am window is the weakest at 74.0%, 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 68.4% on time, compared with 88.2% in September. Across the year that is 20 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.