Flight number record
OO 4690
SkyWest Airlines · Birmingham to Denver
- Route
- BHM → DEN
- Departs
- 15:35
- Flights
- 302
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4690, 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 4690 lands a B+, 3 points better than the national rate of 77.6%. 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 is a workable record, not a spotless one. That rests on 302 flights, with a median arrival 7 minutes early.
Key figures
On time
80.8%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
0.33%
National rate is 1.81%
1 hour+ late
9.8%
National rate is 8.1%
These figures cover 302 flights between July 2025 and June 2026. Beyond the headline rate, 9.8% 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 4690 flies
OO 4690 flies BHM to DEN without a single fixed slot. Its most common scheduled departure was 15:35, used on 115 of 302 flights, with 15:30 (54 flights) and 15:18 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:35115 flights38.1%
- Departs 15:3054 flights17.9%
- Departs 15:1837 flights12.3%
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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4690 runs 8 points better at 80.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
OO 4690 next to BHM to DEN
Every carrier on BHM to DEN combined arrived on time 83.2% of the time across 1,192 flights, so OO 4690 is 2 points behind it. SkyWest flew 667 flights on the same city pair under all its flight numbers, including this one, and those ran 86.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4690thin sample | 302 | 80.8% | 81 min | 0.33% | B+ |
| All SkyWest Airlines on BHM–DEN | 667 | 86.7% | 76 min | 0.30% | A+ |
| All carriers on BHM–DEN | 1,192 | 83.2% | 64 min | 0.17% | B+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 4690 quarter by quarter
OO 4690 did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.9% on time and its weakest Jul–Sep 2025 at 64.8%, a swing of 25 points on roughly 101 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 flights64.8%
- Oct–Dec 202591 flights84.6%
- Jan–Mar 202690 flights89.9%
- Apr–Jun 202629 flights—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4690 ranged from 76.2% on Monday to 85.4% on Thursday. With about 43 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why OO 4690 runs late
One category carries most of the weight here. Carrier accounts for 44% of the 4,638 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.
- 44%Carrier
- 41%National Airspace System
- 14%Late-arriving aircraft
- 0%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 1,919 minutes out of 4,638, against a national NAS share of 21%. The split is drawn from 4,638 delay minutes reported on OO 4690.
Cancellations are rare at 0.33%, 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. 9.8% 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 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. 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 five other city pairs in the data, including BUF to ORD (35), CLT to IAH (18) and GJT to DEN (6), but none flew often enough under OO 4690 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BHM to DEN only.
One caution: this is a thin sample. 302 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 4690
For a booking, read OO 4690 as 80.8% on time with 0.33% cancelled over 302 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BHM to DEN, every carrier and departure
- DEN to BHM, the return direction
- SkyWest Airlines 5295 on the same route91.8%
- 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
- How often a connection fails at the major US hubs
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.