Flight number record

OO 5780

SkyWest Airlines · Memphis to Chicago

Route: MEM → ORD
Departs: 14:46
Flights: 279
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5780, 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 5780 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 279 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so OO 5780 runs 9 points behind the country as a whole. Across a thousand flights that is about 90 extra late arrivals.

On time

68.6%

Arrivals under 15 minutes late, of 271 completed flights

Avg delay

82 min

Across delayed arrivals only, not all flights

Cancelled

1.43%

National rate is 1.81%

1 hour+ late

12.9%

National rate is 8.1%

These figures cover 279 flights between July 2025 and June 2026. Beyond the headline rate, 12.9% 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 5780 flies

OO 5780 flies MEM to ORD without a single fixed slot. Its most common scheduled departure was 14:46, used on 49 of 279 flights, with 14:48 (48 flights) and 14:55 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:4649 flights17.6%
Departs 14:4848 flights17.2%
Departs 14:5536 flights12.9%

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 14:46 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 5780 runs 4 points worse at 68.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5780 next to MEM to ORD

Every carrier on MEM to ORD combined arrived on time 76.0% of the time across 2,473 flights, so OO 5780 is 7 points behind it. SkyWest flew 835 flights on the same city pair under all its flight numbers, including this one, and those ran 73.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 10 points.

OO 5780 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5780thin sample	279	68.6%	82 min	1.43%	C
All SkyWest Airlines on MEM–ORD	835	73.1%	90 min	2.28%	C
All carriers on MEM–ORD	2,473	76.0%	79 min	3.15%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5780 quarter by quarter

OO 5780 did not run the same all year. Its best quarter was Oct–Dec 2025 at 76.1% on time and its weakest Apr–Jun 2026 at 56.8%, a swing of 19 points on roughly 93 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 202591 flights73.6%
Oct–Dec 202589 flights76.1%
Jan–Mar 20268 flights—
Apr–Jun 202691 flights56.8%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5780 did best on Thursday at 76.3% on time and worst on Monday at 60.0%. Each day rests on about 40 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5780 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,991 reported delay minutes.

National Airspace System
33%
Late-arriving aircraft
26%
Carrier
25%
Extreme weather
15%

Extreme weather accounts for 15% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.5 times the usual weather exposure. The split is drawn from 6,991 delay minutes reported on OO 5780.

Cancellations sit at 1.43% against a national 1.81%, which is ordinary. Diversions add another 1.43%.

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. 12.9% 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 one other city pair in the data, including GRB to ORD (23), but none flew often enough under OO 5780 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MEM to ORD only.

One caution: this is a thin sample. 279 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 5780

For a booking, OO 5780 is a flight to put a long connection behind. 12.9% 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