Flight number record

OO 4774

SkyWest Airlines · Denver to Knoxville

Route: DEN → TYS
Departs: 17:30
Flights: 300
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4774, 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 4774 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 about an hour behind schedule. That rests on 300 flights, with a median arrival 7 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4774 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 298 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

0.67%

National rate is 1.81%

1 hour+ late

11.7%

National rate is 8.1%

These figures cover 300 flights between July 2025 and June 2026. Beyond the headline rate, 11.7% 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 4774 flies

OO 4774 flies DEN to TYS without a single fixed slot. Its most common scheduled departure was 17:30, used on 106 of 300 flights, with 17:25 (63 flights) and 17:20 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:30106 flights35.3%
Departs 17:2563 flights21.0%
Departs 17:2049 flights16.3%

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 17:30 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4774 runs 3 points better at 71.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4774 next to DEN to TYS

Every carrier on DEN to TYS combined arrived on time 78.0% of the time across 967 flights, so OO 4774 is 7 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 8 points.

OO 4774 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4774thin sample	300	71.5%	64 min	0.67%	C+
All SkyWest Airlines on DEN–TYS	393	76.1%	64 min	1.02%	B
All carriers on DEN–TYS	967	78.0%	68 min	0.52%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4774 quarter by quarter

OO 4774 did not run the same all year. Its best quarter was Oct–Dec 2025 at 83.3% on time and its weakest Jul–Sep 2025 at 51.1%, a swing of 32 points on roughly 100 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 flights51.1%
Oct–Dec 202590 flights83.3%
Jan–Mar 202689 flights77.0%
Apr–Jun 202629 flights—

Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4774 did best on Tuesday at 79.1% on time and worst on Friday at 60.5%. Each day rests on about 43 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4774 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,437 reported delay minutes.

Late-arriving aircraft
36%
National Airspace System
33%
Carrier
27%
Extreme weather
4%

36% 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 5,437 reported delay minutes here, that single category outweighs weather by 9 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 5,437 delay minutes reported on OO 4774.

Cancellations are rare at 0.67%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.7% 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.

The 1,162 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on two other city pairs in the data, including DEN to MKE (41) and IAH to MKE (21), but none flew often enough under OO 4774 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to TYS only.

One caution: this is a thin sample. 300 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 4774

For a booking, OO 4774 is one of the weaker ways to fly DEN to TYS: 7 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