Flight number record

OO 4800

SkyWest Airlines · Grand Junction to Denver

Route: GJT → DEN
Departs: 05:30
Flights: 326
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4800, 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 4800 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 326 flights, with a median arrival 19 minutes early.

Set against the rest of the country, OO 4800's record is 10 points better than the US average of 77.6%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.

On time

87.7%

Arrivals under 15 minutes late, of 326 completed flights

Avg delay

106 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

4.9%

National rate is 8.1%

These figures cover 326 flights between July 2025 and June 2026. The median arrival is 19 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 4800 flies

OO 4800 is scheduled to leave Grand Junction (GJT) at 05:30 local time and reach Denver (DEN) at 06:51. That slot held for 326 of the 326 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 05:30326 flights100.0%

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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4800 runs level with that at 87.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 4800 next to GJT to DEN

Every carrier on GJT to DEN combined arrived on time 77.6% of the time across 2,229 flights, so OO 4800 is 10 points ahead of it. SkyWest flew 1,496 flights on the same city pair under all its flight numbers, including this one, and those ran 75.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.

OO 4800 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4800thin sample	326	87.7%	106 min	0.00%	A+
All SkyWest Airlines on GJT–DEN	1,496	75.5%	78 min	2.01%	B
All carriers on GJT–DEN	2,229	77.6%	75 min	1.48%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4800 quarter by quarter

OO 4800 did not run the same all year. Its best quarter was Oct–Dec 2025 at 92.2% on time and its weakest Jan–Mar 2026 at 80.8%, a swing of 11 points on roughly 82 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 202591 flights86.8%
Oct–Dec 202577 flights92.2%
Jan–Mar 202673 flights80.8%
Apr–Jun 202685 flights90.6%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4800 ranged from 81.6% on Sunday to 91.1% on Tuesday. With about 47 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.

Delay causes

Why OO 4800 runs late

One category carries most of the weight here. Carrier accounts for 88% of the 4,234 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.

Carrier
88%
Late-arriving aircraft
5%
National Airspace System
4%
Extreme weather
3%

The largest share of delay minutes, 88%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,734 of the 4,234 delay minutes reported here. The split is drawn from 4,234 delay minutes reported on OO 4800.

Cancellations are rare at 0.00%, below the national 1.81% 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 4.9% 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 five other city pairs in the data, including CMH to ORD (19), ORD to AVL (11) and DTW to ORD (3), but none flew often enough under OO 4800 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GJT to DEN only.

One caution: this is a thin sample. 326 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 4800

For a booking, OO 4800 has one of the better records a US domestic flight can show: 87.7% on time and 0.00% 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