Carrier route record
UAIAH→OKC
United Airlines · Houston to Oklahoma City
- Flights
- 334
- Period
- September 2025 to August 2026
- Share of route
- 27%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on IAH to OKC lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 334 flights, with a median arrival 12 minutes early.
Set against the rest of the country, United's IAH to OKC record is 5 points better than the US average of 77.3%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.
Key figures
On time
82.0%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.50%
National rate is 1.89%
Whole route
80.5%
Every carrier on IAH to OKC, 1,224 flights
These figures cover 334 flights between September 2025 and August 2026. The median arrival is 12 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.
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Carrier by carrier
United against every carrier on IAH to OKC
United flew 334 of the 1,224 flights on IAH to OKC, about 27% of it. Its 82.0% on time is 2 points better than the route as a whole, which runs 80.5%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from United at 82.0% to SkyWest at 80.0%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines (this page)thin sample | 334 | 82.0% | 64 min | 1.50% | B |
| SkyWest Airlines | 890 | 80.0% | 89 min | 1.12% | B |
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against half a point between the best and worst carrier.
- 5am–8am44 flights100.0%
- 8am–11am3 flights—
- 11am–2pm5 flights—
- 2pm–5pm47 flights83.0%
- 5pm–8pm21 flights—
- 8pm–5am214 flights78.0%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 100.0% of the time, against 78.0% for the overnight window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 214 flights scheduled in it.
Across the year
United on IAH to OKC through the year
- Jul–Sep 202519 flights—
- Oct–Dec 202572 flights88.9%
- Jan–Mar 202689 flights81.4%
- Apr–Jun 202690 flights76.4%
- Jul–Sep 202664 flights77.4%
Scale runs 70% 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 82.0% on time across 334 flights.
United on IAH to OKC did not run the same all year. Its best quarter was Oct–Dec 2025 at 88.9% on time and its weakest Apr–Jun 2026 at 76.4%, a swing of 13 points on roughly 84 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Wednesday is the strongest day at 88.9% on time and Friday the weakest at 72.9%, a spread of 16 points.
Arrival by arrival
How late United on IAH to OKC runs when it is late
United on IAH to OKC often beats the schedule: 117 of 328 completed flights, 36%, arrived 15 minutes or more early. The 59 late arrivals split 13 under half an hour, 23 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early117 flights35.7%
- Within 15 min152 flights46.3%
- 15–29 min late13 flights4.0%
- 30–59 min late23 flights7.0%
- 1–2 hours late16 flights4.9%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 328 completed flights by arrival against schedule.
8 of 61 late departures made up the time and arrived on time, 13% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for United on IAH to OKC
The latest arrival of the period was on 29 November 2025, 3 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across November, January, April and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 November 2025 | 3 hours 43 minutes | Carrier |
| 27 January 2026 | 2 hours 48 minutes | Late-arriving aircraft |
| 3 April 2026 | 2 hours 36 minutes | National Airspace System |
| 18 November 2025 | 2 hours 21 minutes | Carrier |
| 27 March 2026 | 2 hours 17 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 45% of the 3,785 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 37%Carrier
- 13%National Airspace System
- 4%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,785 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 3,785 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,418 of the 3,785 delay minutes reported here.
Cancellations sit at 1.50% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and stage length
What a delay here costs
7.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
At 395 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 80.7% on time across 335 flights, within about a point 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. 334 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 United on IAH to OKC
Put together: treat all of this as provisional. 334 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 82.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 328 completed flights over 12 months sit behind that.
Related
Where to go next
- IAH to OKC, every carrier
- United on OKC to IAH, the return leg
- SkyWest Airlines on IAH to OKC80.0%
- United Airlines network-wide record
- George Bush Intercontinental (IAH) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.