Flight number record

OO 4728

SkyWest Airlines · Billings to Denver

Route: BIL → DEN
Departs: 10:54
Flights: 254
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4728, 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 4728 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 254 flights, with a median arrival 17 minutes early.

Set against the rest of the country, OO 4728's record is 11 points better than the US average of 77.6%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 252 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

0.79%

National rate is 1.81%

1 hour+ late

5.2%

National rate is 8.1%

These figures cover 254 flights between July 2025 and June 2026. The median arrival is 17 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 4728 flies

OO 4728 flies BIL to DEN without a single fixed slot. Its most common scheduled departure was 10:54, used on 53 of 254 flights, with 10:30 (49 flights) and 10:52 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:5453 flights20.9%
Departs 10:3049 flights19.3%
Departs 10:5235 flights13.8%

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 10:54 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4728 runs 4 points better at 88.1%. 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 4728 next to BIL to DEN

Every carrier on BIL to DEN combined arrived on time 82.3% of the time across 1,782 flights, so OO 4728 is 6 points ahead of it. SkyWest flew 1,052 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.

OO 4728 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4728thin sample	254	88.1%	74 min	0.79%	A+
All SkyWest Airlines on BIL–DEN	1,052	81.9%	82 min	1.43%	B
All carriers on BIL–DEN	1,782	82.3%	76 min	0.84%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4728 quarter by quarter

OO 4728 did not run the same all year. Its best quarter was Apr–Jun 2026 at 96.0% on time and its weakest Jan–Mar 2026 at 85.1%, a swing of 11 points on roughly 85 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 202586 flights88.4%
Oct–Dec 202530 flights—
Jan–Mar 202688 flights85.1%
Apr–Jun 202650 flights96.0%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4728 ranged from 85.7% on Friday to 94.7% on Tuesday. With about 36 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 4728 runs late

One category carries most of the weight here. Carrier accounts for 43% of the 2,226 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
43%
Late-arriving aircraft
35%
National Airspace System
21%
Extreme weather
2%

35% 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 2,226 reported delay minutes here, that single category outweighs weather by 17 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 2,226 delay minutes reported on OO 4728.

Cancellations are rare at 0.79%, 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

5.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

The same number turns up on four other city pairs in the data, including COS to ORD (36), COU to ORD (31) and GSP to ORD (6), but none flew often enough under OO 4728 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BIL to DEN only.

One caution: this is a thin sample. 254 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 4728

For a booking, OO 4728 has one of the better records a US domestic flight can show: 88.1% on time and 0.79% 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