Flight number record
OO 5815
SkyWest Airlines · Denver to Birmingham
- Route
- DEN → BHM
- Departs
- 17:30
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5815, 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 5815 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 307 flights, with a median arrival 11 minutes early.
Key figures
On time
78.8%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.33%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 5815 flies
OO 5815 flies DEN to BHM without a single fixed slot. Its most common scheduled departure was 17:30, used on 57 of 307 flights, with 17:27 (52 flights) and 17:50 (46 flights) next.
- Departs 17:3057 flights18.6%
- Departs 17:2752 flights16.9%
- Departs 17:5046 flights15.0%
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 17:30 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 5815 runs 11 points better at 78.8%. 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 5815 next to DEN to BHM
Every carrier on DEN to BHM combined arrived on time 72.5% of the time across 1,236 flights, so OO 5815 is 6 points ahead of it. SkyWest flew 604 flights on the same city pair under all its flight numbers, including this one, and those ran 79.2% on time. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5815thin sample | 307 | 78.8% | 71 min | 0.33% | B+ |
| All SkyWest Airlines on DEN–BHM | 604 | 79.2% | 78 min | 0.33% | B+ |
| All carriers on DEN–BHM | 1,236 | 72.5% | 68 min | 0.32% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5815 quarter by quarter
OO 5815 did not run the same all year. Its best quarter was Oct–Dec 2025 at 85.7% on time and its weakest Jul–Sep 2026 at 65.0%, a swing of 21 points on roughly 61 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 202530 flights70.0%
- Oct–Dec 202591 flights85.7%
- Jan–Mar 202690 flights83.1%
- Apr–Jun 202656 flights75.0%
- Jul–Sep 202640 flights65.0%
Scale runs 55% to 90%.
By weekday, OO 5815 did best on Wednesday at 86.4% on time and worst on Friday at 65.1%. Each day rests on about 44 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5815 runs when it is late
OO 5815 often beats the schedule: 135 of 306 completed flights, 44%, arrived 15 minutes or more early. The 65 late arrivals split 25 under half an hour, 27 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early135 flights44.1%
- Within 15 min106 flights34.6%
- 15–29 min late25 flights8.2%
- 30–59 min late27 flights8.8%
- 1–2 hours late7 flights2.3%
- 2+ hours late6 flights2.0%
Scale runs 0% to 100%.
Share of 306 completed flights by arrival against schedule.
7 of 53 late departures made up the time and arrived on time, 13% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BHM.
The worst days
Worst days for OO 5815
The latest arrival of the period was on 8 August 2026, 13 hours 42 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 August 2026 | 13 hours 42 minutes | National Airspace System |
| 7 November 2025 | 11 hours 56 minutes | Carrier |
| 15 March 2026 | 3 hours 33 minutes | National Airspace System |
| 17 February 2026 | 2 hours 52 minutes | National Airspace System |
| 7 March 2026 | 2 hours 46 minutes | Extreme weather |
Delay causes
Why OO 5815 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 4,584 reported delay minutes.
- 41%National Airspace System
- 37%Carrier
- 11%Late-arriving aircraft
- 11%Extreme weather
41% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,876 minutes out of 4,584, against a national NAS share of 21%. The split is drawn from 4,584 delay minutes reported on OO 5815.
Cancellations are rare at 0.33%, 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
Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,083 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 SFO to DFW (3), but none flew often enough under OO 5815 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BHM only.
One caution: this is a thin sample. 307 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 5815
For a booking, read OO 5815 as 78.8% on time with 0.33% cancelled over 307 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to BHM, every carrier and departure
- BHM to DEN, the return direction
- 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
- Worst months to fly in the US, ranked by the data
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.