Flight number record

OO 5531

SkyWest Airlines · Oklahoma City to Houston

Route: OKC → IAH
Departs: 13:45
Flights: 329
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5531, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

OO 5531 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 329 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 5531's record is 8 points better than the US average of 77.3%. That gap is worth roughly 81 fewer late arrivals for every thousand flights.

On time

85.4%

Arrivals under 15 minutes late, of 328 completed flights

Avg delay

90 min

Across delayed arrivals only, not all flights

Cancelled

0.30%

National rate is 1.89%

1 hour+ late

6.4%

National rate is 8.3%

These figures cover 329 flights between September 2025 and August 2026. The median arrival is 13 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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Schedule

When OO 5531 flies

OO 5531 flies OKC to IAH without a single fixed slot. Its most common scheduled departure was 13:45, used on 97 of 329 flights, with 13:43 (70 flights) and 13:40 (36 flights) next.

Departs 13:4597 flights29.5%
Departs 13:4370 flights21.3%
Departs 13:4036 flights10.9%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5531 runs 7 points better at 85.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

OO 5531 next to OKC to IAH

Every carrier on OKC to IAH combined arrived on time 85.1% of the time across 1,224 flights, so OO 5531 is about level with it. SkyWest flew 889 flights on the same city pair under all its flight numbers, including this one, and those ran 86.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 7 points.

OO 5531 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5531thin sample	329	85.4%	90 min	0.30%	A+
All SkyWest Airlines on OKC–IAH	889	86.8%	82 min	1.01%	A
All carriers on OKC–IAH	1,224	85.1%	77 min	1.06%	A
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 5531 quarter by quarter

Quarter by quarter OO 5531 held fairly steady: 85.7% in Oct–Dec 2025, 85.4% in Jan–Mar 2026, 84.6% in Apr–Jun 2026 and 82.0% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202524 flights—
Oct–Dec 202563 flights85.7%
Jan–Mar 202690 flights85.4%
Apr–Jun 202691 flights84.6%
Jul–Sep 202661 flights82.0%

Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5531 did best on Tuesday at 93.6% on time and worst on Monday at 79.6%. Each day rests on about 47 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 5531 runs when it is late

OO 5531 often beats the schedule: 148 of 328 completed flights, 45%, arrived 15 minutes or more early. The 48 late arrivals split 17 under half an hour, 10 between 30 and 60 minutes, and 21 an hour or more.

15+ min early148 flights45.1%
Within 15 min132 flights40.2%
15–29 min late17 flights5.2%
30–59 min late10 flights3.0%
1–2 hours late8 flights2.4%
2+ hours late13 flights4.0%

Scale runs 0% to 100%.

Share of 328 completed flights by arrival against schedule.

14 of 54 late departures made up the time and arrived on time, 26% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for OO 5531

The latest arrival of the period was on 15 March 2026, 7 hours 2 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.

The latest arrivals of OO 5531 in the period
Date	Arrived late by	Largest filed cause
15 March 2026	7 hours 2 minutes	Late-arriving aircraft
16 March 2026	5 hours 46 minutes	National Airspace System
28 June 2026	5 hours 33 minutes	Late-arriving aircraft
20 December 2025	4 hours 46 minutes	Late-arriving aircraft
18 April 2026	4 hours 1 minute	Late-arriving aircraft

Delay causes

Why OO 5531 runs late

Late-arriving aircraft accounts for 56% of the 4,302 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
56%
Carrier
17%
National Airspace System
16%
Extreme weather
9%
Security
2%

56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,302 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 4,302 delay minutes reported on OO 5531.

Cancellations are rare at 0.30%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

6.4% 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 an hour and a half, which a normal layover absorbs.

The same number turns up on two other city pairs in the data, including ORD to LEX (25) and MLI to ORD (1), but none flew often enough under OO 5531 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to OKC to IAH only.

One caution: this is a thin sample. 329 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 OO 5531

For a booking, OO 5531 has one of the better records a US domestic flight can show: 85.4% on time and 0.30% cancelled. That is a base rate, not a promise about any single day.

Where to go next

A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures