Flight number record

OO 5861

SkyWest Airlines · Denver to Colorado Springs

Route: DEN → COS
Departs: 17:25
Flights: 348
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5861, 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 5861 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 348 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so OO 5861 runs 11 points behind the country as a whole. Across a thousand flights that is about 106 extra late arrivals.

On time

67.0%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.86%

National rate is 1.81%

1 hour+ late

14.8%

National rate is 8.1%

These figures cover 348 flights between July 2025 and June 2026. Beyond the headline rate, 14.8% 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 5861 flies

OO 5861 flies DEN to COS without a single fixed slot. Its most common scheduled departure was 17:25, used on 103 of 348 flights, with 17:54 (87 flights) and 17:55 (77 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:25103 flights29.6%
Departs 17:5487 flights25.0%
Departs 17:5577 flights22.1%

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 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 5861 runs level with that at 67.0%. 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 5861 next to DEN to COS

Every carrier on DEN to COS combined arrived on time 75.8% of the time across 5,039 flights, so OO 5861 is 9 points behind it. SkyWest flew 3,283 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 12 points.

OO 5861 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5861thin sample	348	67.0%	77 min	0.86%	C+
All SkyWest Airlines on DEN–COS	3,283	76.5%	72 min	1.89%	B
All carriers on DEN–COS	5,039	75.8%	67 min	1.45%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5861 quarter by quarter

OO 5861 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.7% on time and its weakest Jul–Sep 2025 at 50.6%, a swing of 36 points on roughly 87 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 flights50.6%
Oct–Dec 202575 flights86.7%
Jan–Mar 202690 flights67.8%
Apr–Jun 202691 flights65.9%

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

By weekday, OO 5861 did best on Saturday at 73.5% on time and worst on Friday at 58.0%. Each day rests on about 50 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5861 runs late

One category carries most of the weight here. Carrier accounts for 43% of the 8,781 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
43%
Late-arriving aircraft
31%
National Airspace System
15%
Extreme weather
11%
Security
0%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 8,781 delay minutes reported on OO 5861.

Cancellations are rare at 0.86%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.8% 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 one other city pair in the data, including TYS to DEN (16), but none flew often enough under OO 5861 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to COS only.

One caution: this is a thin sample. 348 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 5861

For a booking, OO 5861 is a flight to put a long connection behind. 14.8% 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