Flight number record

OO 4013

SkyWest Airlines · Detroit to Lexington

Route: DTW → LEX
Departs: 20:15
Flights: 327
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4013, 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 4013 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land close to two hours behind schedule. That rests on 327 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4013 runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.

On time

72.9%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

110 min

Across delayed arrivals only, not all flights

Cancelled

1.83%

National rate is 1.81%

1 hour+ late

12.8%

National rate is 8.1%

These figures cover 327 flights between July 2025 and June 2026. Beyond the headline rate, 12.8% 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 4013 flies

OO 4013 flies DTW to LEX without a single fixed slot. Its most common scheduled departure was 20:15, used on 76 of 327 flights, with 19:55 (52 flights) and 20:25 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:1576 flights23.2%
Departs 19:5552 flights15.9%
Departs 20:2536 flights11.0%

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 20:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 4013 runs 2 points better at 72.9%. 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 4013 next to DTW to LEX

Every carrier on DTW to LEX combined arrived on time 78.3% of the time across 785 flights, so OO 4013 is 5 points behind it. SkyWest flew 520 flights on the same city pair under all its flight numbers, including this one, and those ran 73.9% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 6 points.

OO 4013 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4013thin sample	327	72.9%	110 min	1.83%	C
All SkyWest Airlines on DTW–LEX	520	73.9%	111 min	1.73%	C
All carriers on DTW–LEX	785	78.3%	102 min	1.53%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4013 quarter by quarter

OO 4013 did not run the same all year. Its best quarter was Oct–Dec 2025 at 83.8% on time and its weakest Jan–Mar 2026 at 61.2%, a swing of 23 points on roughly 82 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 202580 flights68.8%
Oct–Dec 202577 flights83.8%
Jan–Mar 202682 flights61.2%
Apr–Jun 202688 flights78.2%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4013 did best on Saturday at 84.4% on time and worst on Monday at 66.7%. Each day rests on about 47 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4013 runs late

One category carries most of the weight here. Carrier accounts for 74% of the 9,540 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
74%
Extreme weather
18%
National Airspace System
8%

Extreme weather accounts for 18% 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 3.0 times the usual weather exposure. The split is drawn from 9,540 delay minutes reported on OO 4013.

Cancellations sit at 1.83% 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. 12.8% 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 four other city pairs in the data, including MSP to OMA (16), MEM to DTW (3) and DTW to MEM (3), but none flew often enough under OO 4013 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to LEX only.

One caution: this is a thin sample. 327 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 4013

For a booking, OO 4013 is a flight to put a long connection behind. 12.8% 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