Flight number record
OO 5798
SkyWest Airlines · Memphis to Houston
- Route
- MEM → IAH
- Departs
- 15:23
- Flights
- 251
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5798, 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 5798 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 251 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5798 runs 4 points behind the country as a whole. Across a thousand flights that is about 42 extra late arrivals.
Key figures
On time
73.1%
Arrivals under 15 minutes late, of 249 completed flights
Avg delay
93 min
Across delayed arrivals only, not all flights
Cancelled
0.40%
National rate is 1.89%
1 hour+ late
12.0%
National rate is 8.3%
These figures cover 251 flights between September 2025 and August 2026. Beyond the headline rate, 12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5798 flies
OO 5798 flies MEM to IAH without a single fixed slot. Its most common scheduled departure was 15:23, used on 82 of 251 flights, with 15:26 (68 flights) next.
- Departs 15:2382 flights32.7%
- Departs 15:2668 flights27.1%
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 15:23 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5798 runs level with that at 73.1%. 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 5798 next to MEM to IAH
Every carrier on MEM to IAH combined arrived on time 80.9% of the time across 1,075 flights, so OO 5798 is 8 points behind it. SkyWest flew 723 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 78.7%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5798thin sample | 251 | 73.1% | 93 min | 0.40% | C+ |
| All SkyWest Airlines on MEM–IAH | 723 | 78.6% | 86 min | 0.83% | B+ |
| All carriers on MEM–IAH | 1,075 | 80.9% | 77 min | 1.02% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5798 quarter by quarter
OO 5798 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Apr–Jun 2026 at 66.1%, a swing of 27 points on roughly 63 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 202530 flights93.3%
- Oct–Dec 202592 flights67.4%
- Jan–Mar 20265 flights—
- Apr–Jun 202662 flights66.1%
- Jul–Sep 202662 flights76.7%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5798 did best on Saturday at 80.6% on time and worst on Thursday at 61.1%. Each day rests on about 36 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5798 runs when it is late
OO 5798 often beats the schedule: 65 of 249 completed flights, 26%, arrived 15 minutes or more early. The 67 late arrivals split 19 under half an hour, 18 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early65 flights26.1%
- Within 15 min117 flights47.0%
- 15–29 min late19 flights7.6%
- 30–59 min late18 flights7.2%
- 1–2 hours late18 flights7.2%
- 2+ hours late12 flights4.8%
Scale runs 0% to 100%.
Share of 249 completed flights by arrival against schedule.
15 of 66 late departures made up the time and arrived on time, 23% of them. In the other direction, 16 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 OO 5798
The latest arrival of the period was on 1 December 2025, 20 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 December 2025 | 20 hours 53 minutes | Carrier |
| 7 June 2026 | 5 hours 32 minutes | Late-arriving aircraft |
| 28 December 2025 | 5 hours | Late-arriving aircraft |
| 7 December 2025 | 4 hours 36 minutes | National Airspace System |
| 2 June 2026 | 3 hours 49 minutes | Extreme weather |
Delay causes
Why OO 5798 runs late
Late-arriving aircraft accounts for 43% of the 6,217 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 35%Carrier
- 17%National Airspace System
- 5%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,217 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 6,217 delay minutes reported on OO 5798.
Cancellations are rare at 0.40%, 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
12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 DEN to MCI (55), ORD to PIA (15) and DEN to MKE (6), but none flew often enough under OO 5798 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MEM to IAH only.
One caution: this is a thin sample. 251 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 5798
For a booking, OO 5798 is a flight to put a long connection behind. 12.0% 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.
Related
Where to go next
- MEM to IAH, every carrier and departure
- IAH to MEM, the return direction
- Memphis International (MEM) delay statistics
- George Bush Intercontinental (IAH) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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 ; recomputed monthly. How this data is collected.