Flight number record

OO 5498

SkyWest Airlines · Denver to Billings

Route: DEN → BIL
Departs: 15:35
Flights: 327
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5498, 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 5498 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land roughly 55 minutes behind schedule. That rests on 327 flights, with a median arrival 2 minutes early.

On time

75.1%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

2.45%

National rate is 1.81%

1 hour+ late

6.3%

National rate is 8.1%

These figures cover 327 flights between July 2025 and June 2026. The median arrival is 2 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 5498 flies

OO 5498 flies DEN to BIL without a single fixed slot. Its most common scheduled departure was 15:35, used on 174 of 327 flights, with 15:40 (115 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:35174 flights53.2%
Departs 15:40115 flights35.2%

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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 5498 runs 3 points better at 75.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5498 next to DEN to BIL

Every carrier on DEN to BIL combined arrived on time 79.6% of the time across 1,782 flights, so OO 5498 is 5 points behind it. SkyWest flew 1,052 flights on the same city pair under all its flight numbers, including this one, and those ran 81.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 4 points.

OO 5498 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5498thin sample	327	75.1%	53 min	2.45%	B
All SkyWest Airlines on DEN–BIL	1,052	81.7%	52 min	1.24%	B
All carriers on DEN–BIL	1,782	79.6%	56 min	0.73%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5498 quarter by quarter

OO 5498 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.2% on time and its weakest Jul–Sep 2025 at 66.3%, a swing of 14 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 202592 flights66.3%
Oct–Dec 202591 flights79.3%
Jan–Mar 202653 flights74.0%
Apr–Jun 202691 flights80.2%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5498 did best on Saturday at 81.4% on time and worst on Sunday at 63.8%. Each day rests on about 47 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5498 runs late

One category carries most of the weight here. Carrier accounts for 44% of the 4,210 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
44%
Late-arriving aircraft
31%
National Airspace System
15%
Extreme weather
10%

The largest share of delay minutes, 44%, 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 1,838 of the 4,210 delay minutes reported here. The split is drawn from 4,210 delay minutes reported on OO 5498.

Cancellations sit at 2.45% against a national 1.81%, which is ordinary. Diversions add another 0.61%.

Connections and routes

What a delay on this flight costs

6.3% 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 roughly 55 minutes, which a normal layover absorbs.

The same number turns up on two other city pairs in the data, including ORD to CID (4) and ORD to BZN (1), but none flew often enough under OO 5498 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BIL only.

One caution: this is a thin sample. 327 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 5498

For a booking, read OO 5498 as 75.1% on time with 2.45% cancelled over 327 flights. Those are rates from the past twelve months, not a forecast for any particular 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