Flight number record
OO 5593
SkyWest Airlines · Chicago to Memphis
- Route
- ORD → MEM
- Departs
- 08:50
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5593, 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 5593 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 344 flights, with a median arrival 2 minutes early.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 339 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.87%
National rate is 1.89%
1 hour+ late
5.9%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. The median arrival is 2 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 5593 flies
OO 5593 flies ORD to MEM without a single fixed slot. Its most common scheduled departure was 08:50, used on 109 of 344 flights, with 09:00 (59 flights) and 08:45 (38 flights) next.
- Departs 08:50109 flights31.7%
- Departs 09:0059 flights17.2%
- Departs 08:4538 flights11.0%
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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5593 runs 8 points worse at 76.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5593 next to ORD to MEM
Every carrier on ORD to MEM combined arrived on time 71.7% of the time across 2,525 flights, so OO 5593 is 5 points ahead of it. SkyWest flew 870 flights on the same city pair under all its flight numbers, including this one, and those ran 70.2% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5593thin sample | 344 | 76.4% | 53 min | 0.87% | B+ |
| All SkyWest Airlines on ORD–MEM | 870 | 70.2% | 71 min | 1.72% | C |
| All carriers on ORD–MEM | 2,525 | 71.7% | 71 min | 3.33% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5593 quarter by quarter
OO 5593 did not run the same all year. Its best quarter was Jul–Sep 2026 at 85.5% on time and its weakest Oct–Dec 2025 at 65.3%, a swing of 20 points on roughly 86 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 202528 flights—
- Oct–Dec 202575 flights65.3%
- Jan–Mar 202689 flights77.0%
- Apr–Jun 202690 flights75.6%
- Jul–Sep 202662 flights85.5%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5593 did best on Tuesday at 85.7% on time and worst on Saturday at 62.5%. Each day rests on about 49 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5593 runs when it is late
The 80 late arrivals split 35 under half an hour, 25 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early68 flights20.1%
- Within 15 min191 flights56.3%
- 15–29 min late35 flights10.3%
- 30–59 min late25 flights7.4%
- 1–2 hours late11 flights3.2%
- 2+ hours late9 flights2.7%
Scale runs 0% to 100%.
Share of 339 completed flights by arrival against schedule.
10 of 47 late departures made up the time and arrived on time, 21% of them. In the other direction, 43 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 MEM.
The worst days
Worst days for OO 5593
The latest arrival of the period was on 18 December 2025, 4 hours 24 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across December, March, February and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 December 2025 | 4 hours 24 minutes | Late-arriving aircraft |
| 16 March 2026 | 3 hours 14 minutes | Extreme weather |
| 20 February 2026 | 3 hours 9 minutes | Late-arriving aircraft |
| 6 November 2025 | 3 hours 5 minutes | Carrier |
| 24 March 2026 | 2 hours 46 minutes | Carrier |
Delay causes
Why OO 5593 runs late
Carrier accounts for 56% of the 4,223 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 19%Late-arriving aircraft
- 18%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,370 of the 4,223 delay minutes reported here. The split is drawn from 4,223 delay minutes reported on OO 5593.
Cancellations are rare at 0.87%, 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
5.9% 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 roughly 55 minutes, which a normal layover absorbs.
The same number turns up on three other city pairs in the data, including LNK to ORD (16), BHM to MSN (1) and SMF to SFO (1), but none flew often enough under OO 5593 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to MEM only.
One caution: this is a thin sample. 344 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 5593
For a booking, read OO 5593 as 76.4% on time with 0.87% cancelled over 344 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to MEM, every carrier and departure
- MEM to ORD, the return direction
- Chicago O'Hare International (ORD) delay statistics
- Memphis International (MEM) 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
- Worst months to fly in the US, ranked by the data
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.