Flight number record

OO 4720

SkyWest Airlines · Salt Lake City to Denver

Route: SLC → DEN
Departs: 13:14
Flights: 285
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 285 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 77.6%. That gap is worth roughly 132 fewer late arrivals for every thousand flights.

On time

90.8%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

93 min

Across delayed arrivals only, not all flights

Cancelled

0.35%

National rate is 1.81%

1 hour+ late

3.5%

National rate is 8.1%

These figures cover 285 flights between July 2025 and June 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.

Schedule

When OO 4720 flies

OO 4720 flies SLC to DEN without a single fixed slot. Its most common scheduled departure was 13:14, used on 68 of 285 flights, with 13:00 (56 flights) and 13:10 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:1468 flights23.9%
Departs 13:0056 flights19.6%
Departs 13:1049 flights17.2%

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 13:14 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4720 runs 12 points better at 90.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4720 next to SLC to DEN

Every carrier on SLC to DEN combined arrived on time 77.8% of the time across 7,757 flights, so OO 4720 is 13 points ahead of it. SkyWest flew 1,395 flights on the same city pair under all its flight numbers, including this one, and those ran 84.6% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 12 points.

OO 4720 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4720thin sample	285	90.8%	93 min	0.35%	A+
All SkyWest Airlines on SLC–DEN	1,395	84.6%	76 min	0.65%	B+
All carriers on SLC–DEN	7,757	77.8%	61 min	0.55%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4720 quarter by quarter

Quarter by quarter OO 4720 held fairly steady: 92.4% in Jul–Sep 2025, 94.7% in Oct–Dec 2025 and 92.3% in Apr–Jun 2026. A spread of 2 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights92.4%
Oct–Dec 202576 flights94.7%
Jan–Mar 202626 flights—
Apr–Jun 202691 flights92.3%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4720 did best on Saturday at 97.5% on time and worst on Friday at 85.0%. Each day rests on about 41 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4720 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 2,414 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.

Late-arriving aircraft
47%
Carrier
30%
Extreme weather
18%
National Airspace System
6%

Extreme weather accounts for 18% 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 2,414 delay minutes reported on OO 4720.

Cancellations are rare at 0.35%, 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

Badly late arrivals are rare here: only 3.5% land an hour or more behind schedule, against 8.1% 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 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. 285 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: 90.8% on time and 0.35% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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.

Key figures