Flight number record

OO 4770

SkyWest Airlines · Denver to Grand Junction

Route: DEN → GJT
Departs: 15:45
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4770, 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 4770 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4770 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.

On time

71.8%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

2.47%

National rate is 1.81%

1 hour+ late

11.5%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 4770 flies

OO 4770 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 15:45, used on 89 of 364 flights, with 15:41 (80 flights) and 15:50 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:4589 flights24.5%
Departs 15:4180 flights22.0%
Departs 15:5040 flights11.0%

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 15:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4770 runs level with that at 71.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4770 next to DEN to GJT

Every carrier on DEN to GJT combined arrived on time 79.5% of the time across 2,229 flights, so OO 4770 is 8 points behind it. SkyWest flew 1,496 flights on the same city pair under all its flight numbers, including this one, and those ran 80.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 7 points.

OO 4770 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4770thin sample	364	71.8%	72 min	2.47%	C
All SkyWest Airlines on DEN–GJT	1,496	80.5%	62 min	1.74%	B
All carriers on DEN–GJT	2,229	79.5%	65 min	1.21%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4770 quarter by quarter

OO 4770 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.7% on time and its weakest Jul–Sep 2025 at 61.5%, a swing of 23 points on roughly 91 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 202592 flights61.5%
Oct–Dec 202591 flights84.7%
Jan–Mar 202690 flights75.0%
Apr–Jun 202691 flights67.0%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4770 did best on Tuesday at 84.3% on time and worst on Monday at 52.9%. Each day rests on about 52 flights, so a gap of 31 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4770 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 7,225 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
45%
Late-arriving aircraft
37%
National Airspace System
12%
Extreme weather
7%

37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,225 reported delay minutes here, that single category outweighs weather by 5 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,225 delay minutes reported on OO 4770.

Cancellations sit at 2.47% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

Every one of the 364 flights under OO 4770 in the data flew DEN to GJT. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 364 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 4770

For a booking, OO 4770 is one of the weaker ways to fly DEN to GJT: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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