Flight number record

OO 5593

SkyWest Airlines · Chicago to Memphis

Route: ORD → MEM
Departs: 08:50
Flights: 343
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about 50 minutes behind schedule. That rests on 343 flights, with a median arrival 2 minutes early.

On time

75.4%

Arrivals under 15 minutes late, of 338 completed flights

Avg delay

51 min

Across delayed arrivals only, not all flights

Cancelled

0.87%

National rate is 1.81%

1 hour+ late

5.9%

National rate is 8.1%

These figures cover 343 flights between July 2025 and June 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.

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 343 flights, with 08:57 (49 flights) and 08:45 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:50109 flights31.8%
Departs 08:5749 flights14.3%
Departs 08:4538 flights11.1%

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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 5593 runs 9 points worse at 75.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 5593 next to ORD to MEM

Every carrier on ORD to MEM combined arrived on time 72.8% of the time across 2,468 flights, so OO 5593 is 3 points ahead of it. SkyWest flew 832 flights on the same city pair under all its flight numbers, including this one, and those ran 71.8% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 4 points.

OO 5593 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5593thin sample	343	75.4%	51 min	0.87%	B+
All SkyWest Airlines on ORD–MEM	832	71.8%	67 min	1.44%	C
All carriers on ORD–MEM	2,468	72.8%	66 min	3.04%	C−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5593 quarter by quarter

OO 5593 did not run the same all year. Its best quarter was Jul–Sep 2025 at 82.0% on time and its weakest Oct–Dec 2025 at 65.3%, a swing of 17 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 202589 flights82.0%
Oct–Dec 202575 flights65.3%
Jan–Mar 202689 flights77.0%
Apr–Jun 202690 flights75.6%

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

By weekday, OO 5593 did best on Tuesday at 83.7% on time and worst on Friday at 64.0%. Each day rests on about 49 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5593 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 4,236 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
60%
National Airspace System
17%
Late-arriving aircraft
16%
Extreme weather
7%

The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,552 of the 4,236 delay minutes reported here. The split is drawn from 4,236 delay minutes reported on OO 5593.

Cancellations are rare at 0.87%, 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

5.9% 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 about 50 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. 343 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 75.4% on time with 0.87% cancelled over 343 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