Flight number record
OO 5923
SkyWest Airlines · Denver to Boise
- Route
- DEN → BOI
- Departs
- 20:25
- Flights
- 298
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 298 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5923 runs 6 points behind the country as a whole. Across a thousand flights that is about 55 extra late arrivals.
Key figures
On time
71.8%
Arrivals under 15 minutes late, of 294 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.67%
National rate is 1.89%
1 hour+ late
8.8%
National rate is 8.3%
These figures cover 298 flights between September 2025 and August 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5923 flies
OO 5923 flies DEN to BOI without a single fixed slot. Its most common scheduled departure was 20:25, used on 126 of 298 flights, with 20:28 (56 flights) and 20:20 (42 flights) next.
- Departs 20:25126 flights42.3%
- Departs 20:2856 flights18.8%
- Departs 20:2042 flights14.1%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 20:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 5923 runs level with that at 71.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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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 3,038 flights, so OO 5923 is 5 points behind it. SkyWest flew 898 flights on the same city pair under all its flight numbers, including this one, and those ran 80.7% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5923thin sample | 298 | 71.8% | 58 min | 0.67% | C+ |
| All SkyWest Airlines on DEN–BOI | 898 | 80.7% | 69 min | 0.22% | B+ |
| All carriers on DEN–BOI | 3,038 | 76.3% | 56 min | 0.10% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 Apr–Jun 2026 at 67.0%, a swing of 20 points on roughly 75 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 202525 flights—
- Oct–Dec 202568 flights71.2%
- Jan–Mar 202653 flights86.8%
- Apr–Jun 202691 flights67.0%
- Jul–Sep 202661 flights67.8%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5923 did best on Wednesday at 83.3% on time and worst on Saturday at 60.5%. Each day rests on about 43 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5923 runs when it is late
OO 5923 often beats the schedule: 75 of 294 completed flights, 26%, arrived 15 minutes or more early. The 83 late arrivals split 38 under half an hour, 19 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early75 flights25.5%
- Within 15 min136 flights46.3%
- 15–29 min late38 flights12.9%
- 30–59 min late19 flights6.5%
- 1–2 hours late18 flights6.1%
- 2+ hours late8 flights2.7%
Scale runs 0% to 100%.
Share of 294 completed flights by arrival against schedule.
17 of 87 late departures made up the time and arrived on time, 20% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for OO 5923
The latest arrival of the period was on 29 March 2026, 10 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across March, August, July and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 March 2026 | 10 hours 32 minutes | Late-arriving aircraft |
| 15 March 2026 | 3 hours 16 minutes | National Airspace System |
| 21 August 2026 | 3 hours 9 minutes | Extreme weather |
| 27 July 2026 | 2 hours 43 minutes | Late-arriving aircraft |
| 29 November 2025 | 2 hours 36 minutes | Carrier |
Delay causes
Why OO 5923 runs late
Late-arriving aircraft accounts for 43% of the 4,851 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 26%Carrier
- 21%National Airspace System
- 10%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,851 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 4,851 delay minutes reported on OO 5923.
Cancellations are rare at 0.67%, below the national 1.89% 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
8.8% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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.
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. 298 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, read OO 5923 as 71.8% on time with 0.67% cancelled over 298 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to BOI, every carrier and departure
- BOI to DEN, the return direction
- United Airlines 2014 on the same route68.7%
- Denver International (DEN) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.