Flight number record

OO 4665

SkyWest Airlines · Denver to Bismarck

Route: DEN → BIS
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 4665, 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 4665 draws a D+. 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 1 minute late.

The national on-time rate over the same period is 77.6%, so OO 4665 runs 13 points behind the country as a whole. Across a thousand flights that is about 130 extra late arrivals.

On time

64.6%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

0.86%

National rate is 1.81%

1 hour+ late

15.9%

National rate is 8.1%

These figures cover 348 flights between July 2025 and June 2026. Beyond the headline rate, 15.9% 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 4665 flies

OO 4665 flies DEN to BIS without a single fixed slot. Its most common scheduled departure was 17:25, used on 68 of 348 flights, with 17:40 (48 flights) and 17:55 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:2568 flights19.5%
Departs 17:4048 flights13.8%
Departs 17:5541 flights11.8%

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 4665 runs 4 points worse at 64.6%. 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 4665 next to DEN to BIS

Every carrier on DEN to BIS combined arrived on time 76.2% of the time across 1,502 flights, so OO 4665 is 12 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 14 points.

OO 4665 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4665thin sample	348	64.6%	80 min	0.86%	D+
All SkyWest Airlines on DEN–BIS	1,502	76.2%	88 min	0.73%	B+
All carriers on DEN–BIS	1,502	76.2%	88 min	0.73%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4665 quarter by quarter

OO 4665 did not run the same all year. Its best quarter was Oct–Dec 2025 at 82.7% on time and its weakest Jul–Sep 2025 at 44.0%, a swing of 39 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 flights44.0%
Oct–Dec 202575 flights82.7%
Jan–Mar 202690 flights75.0%
Apr–Jun 202691 flights60.4%

Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4665 did best on Wednesday at 81.6% on time and worst on Thursday at 58.3%. Each day rests on about 50 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4665 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 9,728 reported delay minutes.

Late-arriving aircraft
41%
Carrier
27%
National Airspace System
26%
Extreme weather
7%

41% 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 9,728 reported delay minutes here, that single category outweighs weather by 6 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 9,728 delay minutes reported on OO 4665.

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. 15.9% 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 516 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.

The same number turns up on two other city pairs in the data, including BNA to ORD (16) and IAH to OMA (1), but none flew often enough under OO 4665 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BIS 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 4665

For a booking, OO 4665 is a flight to put a long connection behind. 15.9% 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