Flight number record

OO 5278

SkyWest Airlines · Houston to Oklahoma City

Route: IAH → OKC
Departs: 18:05
Flights: 286
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5278, 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 5278 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 286 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so OO 5278 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 281 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

1.75%

National rate is 1.81%

1 hour+ late

14.2%

National rate is 8.1%

These figures cover 286 flights between July 2025 and June 2026. Beyond the headline rate, 14.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 5278 flies

OO 5278 flies IAH to OKC without a single fixed slot. Its most common scheduled departure was 18:05, used on 56 of 286 flights, with 18:07 (49 flights) and 18:12 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:0556 flights19.6%
Departs 18:0749 flights17.1%
Departs 18:1241 flights14.3%

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 18:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 5278 runs 3 points better at 71.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 5278 next to IAH to OKC

Every carrier on IAH to OKC combined arrived on time 79.3% of the time across 1,399 flights, so OO 5278 is 8 points behind it. SkyWest flew 1,092 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 8 points.

OO 5278 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5278thin sample	286	71.5%	84 min	1.75%	C
All SkyWest Airlines on IAH–OKC	1,092	78.6%	87 min	1.10%	B
All carriers on IAH–OKC	1,399	79.3%	83 min	1.14%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5278 quarter by quarter

OO 5278 did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.3% on time and its weakest Jul–Sep 2025 at 63.7%, a swing of 14 points on roughly 72 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.

Jul–Sep 202592 flights63.7%
Oct–Dec 202555 flights74.5%
Jan–Mar 202669 flights77.3%
Apr–Jun 202670 flights73.9%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5278 did best on Wednesday at 85.0% on time and worst on Saturday at 57.5%. Each day rests on about 41 flights, so a gap of 28 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5278 runs late

One category carries most of the weight here. Carrier accounts for 42% of the 6,724 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.

Carrier
42%
Late-arriving aircraft
42%
Extreme weather
10%
National Airspace System
5%

42% 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 6,724 reported delay minutes here, that single category outweighs weather by 4 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 6,724 delay minutes reported on OO 5278.

Cancellations sit at 1.75% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on three other city pairs in the data, including ORD to HSV (36), ATW to ORD (21) and ORD to ATW (6), but none flew often enough under OO 5278 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to OKC only.

One caution: this is a thin sample. 286 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 5278

For a booking, OO 5278 is a flight to put a long connection behind. 14.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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