Houston (IAH) to Oklahoma City (OKC): On-Time Performance
Data through May 2026
The calendar drives reliability on IAH–OKC. October 2025 flights landed on schedule 88% of the time, but July 2024 dropped to 60% — a gap of 27 points. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 72%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 4.0
- last 12 months
- Duration
- 1h 37m
- scheduled
- Distance
- 395 mi
Best airline from IAH to OKC
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 84% | 12 min | 1.3% | 302 |
| SkyWest Airlines | 75% | 23 min | 1.7% | 2,250 |
Monthly on-time trend
Best time to fly from IAH to OKC
Aim for departures around 9 a.m. (92% on-time); avoid 8 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 24 min |
| Tuesdaybest | 81% | 20 min |
| Wednesday | 78% | 22 min |
| Thursday | 80% | 20 min |
| Friday | 73% | 26 min |
| Saturday | 74% | 18 min |
| Sunday | 74% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations37%
- National airspace system14%
- Weather13%
Frequently asked questions
- How often are flights from IAH to OKC delayed?
- 24% of IAH–OKC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 21 minutes.
- Which airline is most reliable from IAH to OKC?
- United Airlines has the best on-time record on this route at 84%, based on 302 flights. 2 airlines flew IAH–OKC frequently enough to compare in this period.
- What is the best time of day to fly from IAH to OKC?
- Departures around 9 a.m. have the best record (92% on-time), while departures around 8 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to OKC?
- The scheduled IAH–OKC flight time averages 1h 37m over 395 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are IAH to OKC flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from IAH to OKC?
- July 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was October 2025 at 88%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 2,552 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.