Flight number record
OO 5498
SkyWest Airlines · Denver to Billings
- Route
- DEN → BIL
- Departs
- 15:35
- Flights
- 326
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, about a point worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 326 flights, with a median arrival 3 minutes early.
Key figures
On time
75.9%
Arrivals under 15 minutes late, of 316 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.45%
National rate is 1.89%
1 hour+ late
7.3%
National rate is 8.3%
These figures cover 326 flights between September 2025 and August 2026. The median arrival is 3 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.
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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 235 of 326 flights, with 15:40 (65 flights) next.
- Departs 15:35235 flights72.1%
- Departs 15:4065 flights19.9%
Scale runs 0% to 100%.
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 71.9%, and OO 5498 runs 4 points better at 75.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5498 next to DEN to BIL
Every carrier on DEN to BIL combined arrived on time 80.3% of the time across 1,774 flights, so OO 5498 is 4 points behind it. SkyWest flew 1,049 flights on the same city pair under all its flight numbers, including this one, and those ran 81.1% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5498thin sample | 326 | 75.9% | 62 min | 2.45% | B |
| All SkyWest Airlines on DEN–BIL | 1,049 | 81.1% | 71 min | 1.14% | B |
| All carriers on DEN–BIL | 1,774 | 80.3% | 69 min | 0.73% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5498 quarter by quarter
Quarter by quarter OO 5498 held fairly steady: 79.3% in Oct–Dec 2025, 74.0% in Jan–Mar 2026, 80.2% in Apr–Jun 2026 and 71.2% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202591 flights79.3%
- Jan–Mar 202653 flights74.0%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202661 flights71.2%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5498 did best on Saturday at 85.7% on time and worst on Sunday at 61.7%. Each day rests on about 47 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5498 runs when it is late
The 76 late arrivals split 21 under half an hour, 32 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early57 flights18.0%
- Within 15 min183 flights57.9%
- 15–29 min late21 flights6.6%
- 30–59 min late32 flights10.1%
- 1–2 hours late14 flights4.4%
- 2+ hours late9 flights2.8%
Scale runs 0% to 100%.
Share of 316 completed flights by arrival against schedule.
10 of 63 late departures made up the time and arrived on time, 16% of them. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BIL.
The worst days
Worst days for OO 5498
The latest arrival of the period was on 23 August 2026, 6 hours 40 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across August, April, July, January and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 August 2026 | 6 hours 40 minutes | Late-arriving aircraft |
| 17 April 2026 | 3 hours 14 minutes | Extreme weather |
| 12 July 2026 | 3 hours 8 minutes | Extreme weather |
| 4 January 2026 | 2 hours 54 minutes | Carrier |
| 28 December 2025 | 2 hours 51 minutes | Late-arriving aircraft |
Delay causes
Why OO 5498 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 4,671 reported delay minutes.
- 39%Late-arriving aircraft
- 37%Carrier
- 14%National Airspace System
- 10%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,671 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 4,671 delay minutes reported on OO 5498.
Cancellations sit at 2.45% against a national 1.89%, which is ordinary. Diversions add another 0.61%.
Connections and routes
What a delay on this flight costs
7.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, 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. 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 5498
For a booking, read OO 5498 as 75.9% on time with 2.45% cancelled over 326 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to BIL, every carrier and departure
- BIL to DEN, the return direction
- United Airlines 703 on the same route79.9%
- United Airlines 1417 on the same route75.5%
- Denver International (DEN) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.