Carrier route record
UAOKC→IAH
United Airlines · Oklahoma City to Houston
- Flights
- 335
- 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 OKC to IAH lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 335 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on OKC to IAH from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.7%
Arrivals under 15 minutes late, of 331 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
1.19%
National rate is 1.89%
Whole route
85.1%
Every carrier on OKC to IAH, 1,224 flights
These figures cover 335 flights between September 2025 and August 2026. The median arrival is 5 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 OKC to IAH
United flew 335 of the 1,224 flights on OKC to IAH, about 27% of it. Its 80.7% on time is 4 points worse than the route as a whole, which runs 85.1%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 86.8% to United at 80.7%.
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 |
|---|---|---|---|---|---|
| SkyWest Airlines | 889 | 86.8% | 82 min | 1.01% | A |
| United Airlines (this page)thin sample | 335 | 80.7% | 68 min | 1.19% | 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 28 points, against half a point between the best and worst carrier.
- 5am–8am102 flights69.3%
- 8am–11am176 flights91.3%
- 11am–2pm5 flights—
- 2pm–5pm5 flights—
- 5pm–8pm47 flights63.8%
- 8pm–5am—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.8% on time, against 91.3% for the 8am–11am 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 8am–11am window is the busiest, with 176 flights scheduled in it.
Across the year
United on OKC to IAH through the year
- Jul–Sep 202519 flights—
- Oct–Dec 202574 flights74.3%
- Jan–Mar 202688 flights90.6%
- Apr–Jun 202690 flights75.6%
- Jul–Sep 202664 flights76.2%
Scale runs 65% 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 80.7% on time across 335 flights.
United on OKC to IAH did not run the same all year. Its best quarter was Jan–Mar 2026 at 90.6% on time and its weakest Oct–Dec 2025 at 74.3%, a swing of 16 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 91.3% on time and Sunday the weakest at 70.0%, a spread of 21 points.
Arrival by arrival
How late United on OKC to IAH runs when it is late
United on OKC to IAH often beats the schedule: 93 of 331 completed flights, 28%, arrived 15 minutes or more early. The 64 late arrivals split 28 under half an hour, 16 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early93 flights28.1%
- Within 15 min174 flights52.6%
- 15–29 min late28 flights8.5%
- 30–59 min late16 flights4.8%
- 1–2 hours late13 flights3.9%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 331 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 38 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 29 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAH.
The worst days
Worst days for United on OKC to IAH
The latest arrival of the period was on 16 March 2026, 10 hours 54 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 10 hours 54 minutes | National Airspace System |
| 24 February 2026 | 7 hours 10 minutes | Carrier |
| 24 November 2025 | 4 hours 17 minutes | National Airspace System |
| 29 November 2025 | 3 hours 16 minutes | Late-arriving aircraft |
| 7 November 2025 | 2 hours 31 minutes | Carrier |
Delay causes
Why United runs late on this route
National Airspace System accounts for 62% of the 4,373 delay minutes carriers reported here, and the remaining four split what is left.
- 62%National Airspace System
- 27%Carrier
- 11%Late-arriving aircraft
62% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,716 minutes out of 4,373, against a national NAS share of 21%. The split is drawn from 4,373 reported delay minutes.
Cancellations sit at 1.19% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
6.0% 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 a little over 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 8am–11am window matters as much as it does.
The return leg runs 82.0% on time across 334 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. 335 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 OKC to IAH
Put together: treat all of this as provisional. 335 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 80.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 331 completed flights over 12 months sit behind that.
Related
Where to go next
- OKC to IAH, every carrier
- United on IAH to OKC, the return leg
- SkyWest Airlines on OKC to IAH86.8%
- United Airlines network-wide record
- George Bush Intercontinental (IAH) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- The best day of the week to fly, and why it is the second lever
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.