Flight number record

OO 5531

SkyWest Airlines · Oklahoma City to Houston

Route: OKC → IAH
Departs: 13:45
Flights: 330
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 330 flights, with a median arrival 11 minutes early.

Set against the rest of the country, OO 5531's record is 7 points better than the US average of 77.6%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.4%

Arrivals under 15 minutes late, of 327 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

0.30%

National rate is 1.81%

1 hour+ late

7.0%

National rate is 8.1%

These figures cover 330 flights between July 2025 and June 2026. The median arrival is 11 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.

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 159 of 330 flights, with 13:40 (36 flights) and 13:43 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:45159 flights48.2%
Departs 13:4036 flights10.9%
Departs 13:4335 flights10.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 78.8%, and OO 5531 runs 6 points better at 84.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5531 next to OKC to IAH

Every carrier on OKC to IAH combined arrived on time 84.3% of the time across 1,399 flights, so OO 5531 is about level with it. SkyWest flew 1,091 flights on the same city pair under all its flight numbers, including this one, and those ran 85.6% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 5 points.

OO 5531 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5531thin sample	330	84.4%	87 min	0.30%	B+
All SkyWest Airlines on OKC–IAH	1,091	85.6%	77 min	1.01%	A
All carriers on OKC–IAH	1,399	84.3%	78 min	1.00%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5531 quarter by quarter

Quarter by quarter OO 5531 held fairly steady: 82.1% in Jul–Sep 2025, 85.7% in Oct–Dec 2025, 85.4% in Jan–Mar 2026 and 84.6% in Apr–Jun 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 202586 flights82.1%
Oct–Dec 202563 flights85.7%
Jan–Mar 202690 flights85.4%
Apr–Jun 202691 flights84.6%

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

By weekday, OO 5531 did best on Tuesday at 91.7% on time and worst on Monday at 79.2%. Each day rests on about 47 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5531 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 4,449 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
53%
Carrier
27%
National Airspace System
17%
Extreme weather
4%

53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,449 reported delay minutes here, that single category outweighs weather by 15 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,449 delay minutes reported on OO 5531.

Cancellations are rare at 0.30%, below the national 1.81% 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

7.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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. 330 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, read OO 5531 as 84.4% on time with 0.30% cancelled over 330 flights. Those are rates from the past twelve months, not a forecast for any particular 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures