Flight number record
OO 5543
SkyWest Airlines · Jackson to Denver
- Route
- JAC → DEN
- Departs
- 10:45
- Flights
- 310
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5543, 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 5543 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 310 flights, with a median arrival 24 minutes early.
Set against the rest of the country, OO 5543's record is 14 points better than the US average of 77.3%. That gap is worth roughly 144 fewer late arrivals for every thousand flights.
Key figures
On time
91.7%
Arrivals under 15 minutes late, of 302 completed flights
Avg delay
123 min
Across delayed arrivals only, not all flights
Cancelled
2.58%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 310 flights between September 2025 and August 2026. The median arrival is 24 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 5543 flies
OO 5543 flies JAC to DEN without a single fixed slot. Its most common scheduled departure was 10:45, used on 91 of 310 flights, with 10:35 (71 flights) and 10:40 (68 flights) next.
- Departs 10:4591 flights29.4%
- Departs 10:3571 flights22.9%
- Departs 10:4068 flights21.9%
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 10:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5543 runs 8 points better at 91.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5543 next to JAC to DEN
Every carrier on JAC to DEN combined arrived on time 80.1% of the time across 1,631 flights, so OO 5543 is 12 points ahead of it. SkyWest flew 470 flights on the same city pair under all its flight numbers, including this one, and those ran 88.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5543thin sample | 310 | 91.7% | 123 min | 2.58% | A |
| All SkyWest Airlines on JAC–DEN | 470 | 88.0% | 102 min | 2.77% | A |
| All carriers on JAC–DEN | 1,631 | 80.1% | 92 min | 1.23% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5543 quarter by quarter
Quarter by quarter OO 5543 held fairly steady: 96.7% in Jul–Sep 2025, 88.5% in Oct–Dec 2025, 90.6% in Jan–Mar 2026 and 95.4% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202591 flights88.5%
- Jan–Mar 202689 flights90.6%
- Apr–Jun 202687 flights95.4%
- Jul–Sep 202613 flights—
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5543 ranged from 87.8% on Thursday to 95.8% on Saturday. With about 44 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5543 runs when it is late
OO 5543 often beats the schedule: 201 of 302 completed flights, 67%, arrived 15 minutes or more early. The 25 late arrivals split 8 under half an hour, 7 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early201 flights66.6%
- Within 15 min76 flights25.2%
- 15–29 min late8 flights2.6%
- 30–59 min late7 flights2.3%
- 1–2 hours late6 flights2.0%
- 2+ hours late4 flights1.3%
Scale runs 0% to 100%.
Share of 302 completed flights by arrival against schedule.
A late pushback is often recovered here: of 29 departures that left 15 minutes late or more, 10 still arrived on time. Only 6 left on time and still arrived late.
The worst days
Worst days for OO 5543
The latest arrival of the period was on 18 December 2025, 25 hours 21 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across December, March and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 December 2025 | 25 hours 21 minutes | Late-arriving aircraft |
| 17 March 2026 | 2 hours 40 minutes | Carrier |
| 2 March 2026 | 2 hours 35 minutes | Extreme weather |
| 12 February 2026 | 2 hours 9 minutes | Extreme weather |
| 28 December 2025 | 1 hour 59 minutes | Late-arriving aircraft |
Delay causes
Why OO 5543 runs late
Late-arriving aircraft accounts for 64% of the 3,081 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 15%Carrier
- 13%Extreme weather
- 9%National Airspace System
Extreme weather accounts for 13% 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 2.1 times the usual weather exposure. The split is drawn from 3,081 delay minutes reported on OO 5543.
Cancellations run at 2.58%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.3% 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 same number turns up on two other city pairs in the data, including ORD to MCI (21) and SAT to IAH (1), but none flew often enough under OO 5543 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to JAC to DEN only.
One caution: this is a thin sample. 310 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 5543
For a booking, the cancellation rate is the figure to plan around on OO 5543: 2.58% of its 310 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JAC to DEN, every carrier and departure
- DEN to JAC, 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
- 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.