Flight number record

OO 5923

SkyWest Airlines · Denver to Boise

Route: DEN → BOI
Departs: 20:20
Flights: 297
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5923, 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 5923 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 297 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so OO 5923 runs 10 points behind the country as a whole. Across a thousand flights that is about 103 extra late arrivals.

On time

67.3%

Arrivals under 15 minutes late, of 294 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

0.34%

National rate is 1.81%

1 hour+ late

10.9%

National rate is 8.1%

These figures cover 297 flights between July 2025 and June 2026. Beyond the headline rate, 10.9% 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 5923 flies

OO 5923 flies DEN to BOI without a single fixed slot. Its most common scheduled departure was 20:20, used on 102 of 297 flights, with 20:25 (86 flights) and 20:28 (56 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:20102 flights34.3%
Departs 20:2586 flights29.0%
Departs 20:2856 flights18.9%

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 20:20 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 5923 runs 3 points worse at 67.3%. 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 5923 next to DEN to BOI

Every carrier on DEN to BOI combined arrived on time 76.3% of the time across 3,039 flights, so OO 5923 is 9 points behind it. SkyWest flew 874 flights on the same city pair under all its flight numbers, including this one, and those ran 78.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 12 points.

OO 5923 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5923thin sample	297	67.3%	65 min	0.34%	C+
All SkyWest Airlines on DEN–BOI	874	78.7%	71 min	0.11%	B+
All carriers on DEN–BOI	3,039	76.3%	55 min	0.20%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5923 quarter by quarter

OO 5923 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.8% on time and its weakest Jul–Sep 2025 at 52.4%, a swing of 34 points on roughly 74 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 202585 flights52.4%
Oct–Dec 202568 flights71.2%
Jan–Mar 202653 flights86.8%
Apr–Jun 202691 flights67.0%

Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5923 did best on Wednesday at 81.4% on time and worst on Saturday at 55.8%. Each day rests on about 42 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5923 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 6,222 reported delay minutes.

Late-arriving aircraft
37%
Carrier
27%
National Airspace System
27%
Extreme weather
9%

37% 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 6,222 reported delay minutes here, that single category outweighs weather by 4 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 6,222 delay minutes reported on OO 5923.

Cancellations are rare at 0.34%, 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. 10.9% 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 649 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 one other city pair in the data, including IAH to MCI (3), but none flew often enough under OO 5923 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BOI only.

One caution: this is a thin sample. 297 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 5923

For a booking, OO 5923 is one of the weaker ways to fly DEN to BOI: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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