Flight number record

OO 5512

SkyWest Airlines · Denver to Moline

Route: DEN → MLI
Departs: 17:25
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5512, 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 5512 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so OO 5512 runs 8 points behind the country as a whole. Across a thousand flights that is about 78 extra late arrivals.

On time

69.8%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

13.2%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 13.2% 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 5512 flies

OO 5512 flies DEN to MLI without a single fixed slot. Its most common scheduled departure was 17:25, used on 60 of 364 flights, with 17:50 (49 flights) and 17:38 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:2560 flights16.5%
Departs 17:5049 flights13.5%
Departs 17:3841 flights11.3%

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 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 5512 runs level with that at 69.8%. 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 5512 next to DEN to MLI

Every carrier on DEN to MLI combined arrived on time 69.8% of the time across 367 flights, so OO 5512 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 9 points.

OO 5512 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5512thin sample	364	69.8%	72 min	0.00%	C+
All SkyWest Airlines on DEN–MLI	367	69.8%	77 min	0.00%	C+
All carriers on DEN–MLI	367	69.8%	77 min	0.00%	C+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5512 quarter by quarter

OO 5512 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.2% on time and its weakest Jul–Sep 2025 at 47.8%, a swing of 34 points on roughly 91 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 202592 flights47.8%
Oct–Dec 202591 flights76.9%
Jan–Mar 202690 flights82.2%
Apr–Jun 202691 flights72.5%

Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5512 ranged from 65.4% on Friday to 75.0% on Sunday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 5512 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 7,869 reported delay minutes.

Late-arriving aircraft
35%
National Airspace System
31%
Carrier
25%
Extreme weather
10%
Security
0%

35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,869 reported delay minutes here, that single category outweighs weather by 3 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,869 delay minutes reported on OO 5512.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

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. 13.2% 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 751 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 364 flights under OO 5512 in the data flew DEN to MLI. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 364 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 5512

For a booking, OO 5512 is a flight to put a long connection behind. 13.2% 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