Flight number record
OO 4720
SkyWest Airlines · Salt Lake City to Denver
- Route
- SLC → DEN
- Departs
- 13:05
- Flights
- 283
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4720, 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 4720 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 283 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 4720's record is 13 points better than the US average of 77.3%. That gap is worth roughly 134 fewer late arrivals for every thousand flights.
Key figures
On time
90.7%
Arrivals under 15 minutes late, of 280 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 283 flights between September 2025 and August 2026. The median arrival is 14 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 4720 flies
OO 4720 flies SLC to DEN without a single fixed slot. Its most common scheduled departure was 13:05, used on 69 of 283 flights, with 13:00 (62 flights) and 13:14 (55 flights) next.
- Departs 13:0569 flights24.4%
- Departs 13:0062 flights21.9%
- Departs 13:1455 flights19.4%
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 13:05 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4720 runs 12 points better at 90.7%. 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 4720 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 4720 is 12 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 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4720thin sample | 283 | 90.7% | 78 min | 0.35% | A+ |
| 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 4720 quarter by quarter
Quarter by quarter OO 4720 held fairly steady: 90.0% in Jul–Sep 2025, 94.7% in Oct–Dec 2025, 92.3% in Apr–Jun 2026 and 93.1% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202576 flights94.7%
- Jan–Mar 202626 flights—
- Apr–Jun 202691 flights92.3%
- Jul–Sep 202660 flights93.1%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4720 ranged from 85.0% on Friday to 95.1% on Wednesday. With about 40 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4720 runs when it is late
OO 4720 often beats the schedule: 137 of 280 completed flights, 49%, arrived 15 minutes or more early. The 26 late arrivals split 7 under half an hour, 10 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early137 flights48.9%
- Within 15 min117 flights41.8%
- 15–29 min late7 flights2.5%
- 30–59 min late10 flights3.6%
- 1–2 hours late3 flights1.1%
- 2+ hours late6 flights2.1%
Scale runs 0% to 100%.
Share of 280 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 25 departures that left 15 minutes late or more, only 2 made it up before arrival. Only 3 left on time and still arrived late.
The worst days
Worst days for OO 4720
The latest arrival of the period was on 11 September 2025, 5 hours 36 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 September 2025 | 5 hours 36 minutes | Carrier |
| 16 March 2026 | 4 hours 28 minutes | Late-arriving aircraft |
| 24 August 2026 | 2 hours 51 minutes | Late-arriving aircraft |
| 15 March 2026 | 2 hours 41 minutes | Late-arriving aircraft |
| 22 March 2026 | 2 hours 17 minutes | Late-arriving aircraft |
Delay causes
Why OO 4720 runs late
Late-arriving aircraft accounts for 54% of the 2,025 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 31%Carrier
- 9%National Airspace System
- 6%Extreme weather
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,025 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 2,025 delay minutes reported on OO 4720.
Cancellations are rare at 0.35%, 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 3.2% 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 same number turns up on four other city pairs in the data, including ORD to COS (21), ASE to DEN (19) and ORD to BZN (11), but none flew often enough under OO 4720 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. 283 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 4720
For a booking, OO 4720 has one of the better records a US domestic flight can show: 90.7% on time and 0.35% cancelled. That is a base rate, not a promise about any single 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%
- Delta Air Lines 1667 on the same route79.7%
- SkyWest Airlines 5683 on the same route93.9%
- 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
- 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.