Flight number record
OO 5642
SkyWest Airlines · Salt Lake City to Denver
- Route
- SLC → DEN
- Departs
- 08:30
- Flights
- 255
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5642, 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 5642 lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 255 flights, with a median arrival 5 minutes early.
Set against the rest of the country, OO 5642's record is 5 points better than the US average of 77.3%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
82.7%
Arrivals under 15 minutes late, of 255 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 255 flights between September 2025 and August 2026. The median arrival is 5 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 5642 flies
OO 5642 flies SLC to DEN without a single fixed slot. Its most common scheduled departure was 08:30, used on 126 of 255 flights, with 08:20 (44 flights) and 08:25 (36 flights) next.
- Departs 08:30126 flights49.4%
- Departs 08:2044 flights17.3%
- Departs 08:2536 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 08:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5642 runs level with that at 82.7%. 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 5642 next to SLC to DEN
Every carrier on SLC to DEN combined arrived on time 79.0% of the time across 7,709 flights, so OO 5642 is 4 points ahead of it. SkyWest flew 1,378 flights on the same city pair under all its flight numbers, including this one, and those ran 85.7% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5642thin sample | 255 | 82.7% | 61 min | 0.00% | B+ |
| All SkyWest Airlines on SLC–DEN | 1,378 | 85.7% | 65 min | 0.58% | A+ |
| All carriers on SLC–DEN | 7,709 | 79.0% | 61 min | 0.51% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5642 quarter by quarter
OO 5642 did not run the same all year. Its best quarter was Jul–Sep 2026 at 96.8% on time and its weakest Apr–Jun 2026 at 78.9%, a swing of 18 points on roughly 85 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.
- Oct–Dec 202513 flights—
- Jan–Mar 202690 flights80.0%
- Apr–Jun 202690 flights78.9%
- Jul–Sep 202662 flights96.8%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5642 ranged from 77.8% on Wednesday to 88.6% on Thursday. With about 36 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5642 runs when it is late
OO 5642 often beats the schedule: 73 of 255 completed flights, 29%, arrived 15 minutes or more early. The 44 late arrivals split 20 under half an hour, 12 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early73 flights28.6%
- Within 15 min138 flights54.1%
- 15–29 min late20 flights7.8%
- 30–59 min late12 flights4.7%
- 1–2 hours late6 flights2.4%
- 2+ hours late6 flights2.4%
Scale runs 0% to 100%.
Share of 255 completed flights by arrival against schedule.
Only 19 of 255 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 5642
The latest arrival of the period was on 16 April 2026, 5 hours 49 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 April 2026 | 5 hours 49 minutes | Carrier |
| 27 December 2025 | 4 hours 7 minutes | Carrier |
| 19 December 2025 | 3 hours 15 minutes | Late-arriving aircraft |
| 25 February 2026 | 3 hours | Carrier |
| 6 June 2026 | 2 hours 19 minutes | Carrier |
Delay causes
Why OO 5642 runs late
Carrier accounts for 79% of the 2,665 delay minutes carriers reported here, and the remaining four split what is left.
- 79%Carrier
- 14%Late-arriving aircraft
- 7%National Airspace System
The largest share of delay minutes, 79%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,101 of the 2,665 delay minutes reported here. The split is drawn from 2,665 delay minutes reported on OO 5642.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 4.7% 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 three other city pairs in the data, including CPR to DEN (55), ORD to RAP (37) and TUS to DEN (1), but none flew often enough under OO 5642 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to DEN only.
One caution: this is a thin sample. 255 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 5642
For a booking, read OO 5642 as 82.7% on time with 0.00% cancelled over 255 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to DEN, every carrier and departure
- DEN to SLC, the return direction
- Frontier Airlines 3862 on the same route79.6%
- Delta Air Lines 1623 on the same route85.3%
- Delta Air Lines 1586 on the same route68.3%
- Delta Air Lines 1553 on the same route78.9%
- SkyWest Airlines 4720 on the same route90.7%
- Delta Air Lines 1667 on the same route79.7%
- Salt Lake City International (SLC) delay statistics
- 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.