Flight number record
OO 5643
SkyWest Airlines · Denver to Santa Fe
- Route
- DEN → SAF
- Departs
- 15:50
- Flights
- 340
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5643, 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 5643 lands a B, about a point 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 340 flights, with a median arrival 7 minutes early.
Key figures
On time
78.6%
Arrivals under 15 minutes late, of 336 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.18%
National rate is 1.89%
1 hour+ late
8.0%
National rate is 8.3%
These figures cover 340 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5643 flies
OO 5643 flies DEN to SAF without a single fixed slot. Its most common scheduled departure was 15:50, used on 147 of 340 flights, with 15:36 (37 flights) next.
- Departs 15:50147 flights43.2%
- Departs 15:3637 flights10.9%
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 15:50 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5643 runs 7 points better at 78.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5643 next to DEN to SAF
Every carrier on DEN to SAF combined arrived on time 81.0% of the time across 1,684 flights, so OO 5643 is 2 points behind it. 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 5643thin sample | 340 | 78.6% | 73 min | 1.18% | B |
| All SkyWest Airlines on DEN–SAF | 1,684 | 81.0% | 79 min | 1.01% | B |
| All carriers on DEN–SAF | 1,684 | 81.0% | 79 min | 1.01% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5643 quarter by quarter
OO 5643 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.4% on time and its weakest Jul–Sep 2026 at 60.0%, a swing of 26 points on roughly 68 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 flights76.7%
- Oct–Dec 202568 flights86.4%
- Jan–Mar 202690 flights78.9%
- Apr–Jun 202691 flights85.6%
- Jul–Sep 202661 flights60.0%
Scale runs 50% to 90%.
By weekday, OO 5643 did best on Saturday at 86.7% on time and worst on Wednesday at 70.8%. Each day rests on about 49 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5643 runs when it is late
OO 5643 often beats the schedule: 86 of 336 completed flights, 26%, arrived 15 minutes or more early. The 72 late arrivals split 18 under half an hour, 27 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early86 flights25.6%
- Within 15 min178 flights53.0%
- 15–29 min late18 flights5.4%
- 30–59 min late27 flights8.0%
- 1–2 hours late15 flights4.5%
- 2+ hours late12 flights3.6%
Scale runs 0% to 100%.
Share of 336 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 61 departures that left 15 minutes late or more, only 5 made it up before arrival. 16 flights left on time and still arrived late.
The worst days
Worst days for OO 5643
The latest arrival of the period was on 2 January 2026, 6 hours 37 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 January 2026 | 6 hours 37 minutes | Carrier |
| 17 February 2026 | 4 hours 5 minutes | Extreme weather |
| 9 August 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 16 March 2026 | 3 hours 49 minutes | Carrier |
| 11 September 2025 | 3 hours 44 minutes | Carrier |
Delay causes
Why OO 5643 runs late
Carrier accounts for 56% of the 5,243 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 17%Extreme weather
- 16%Late-arriving aircraft
- 12%National Airspace System
Extreme weather accounts for 17% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.8 times the usual weather exposure. The split is drawn from 5,243 delay minutes reported on OO 5643.
Cancellations sit at 1.18% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.0% 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 a little over an hour, which a normal layover absorbs.
The same number turns up on one other city pair in the data, including ORD to SYR (16), but none flew often enough under OO 5643 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to SAF only.
One caution: this is a thin sample. 340 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 5643
For a booking, read OO 5643 as 78.6% on time with 1.18% cancelled over 340 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to SAF, every carrier and departure
- SAF to DEN, the return direction
- SkyWest Airlines 4684 on the same route75.8%
- SkyWest Airlines 5310 on the same route77.9%
- SkyWest Airlines 4731 on the same route89.6%
- 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.