Flight number record
OO 5018
SkyWest Airlines · Denver to Riverton
- Route
- DEN → RIW
- Departs
- 21:04
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5018, 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 5018 lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 363 flights, with a median arrival 8 minutes early.
Key figures
On time
79.0%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
116 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
8.7%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5018 flies
OO 5018 flies DEN to RIW without a single fixed slot. Its most common scheduled departure was 21:04, used on 143 of 363 flights, with 21:05 (86 flights) and 20:39 (82 flights) next.
- Departs 21:04143 flights39.4%
- Departs 21:0586 flights23.7%
- Departs 20:3982 flights22.6%
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 21:04 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 5018 runs 9 points better at 79.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 5018 next to DEN to RIW
Every carrier on DEN to RIW combined arrived on time 81.9% of the time across 728 flights, so OO 5018 is 3 points behind it. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5018thin sample | 363 | 79.0% | 116 min | 1.10% | B |
| All SkyWest Airlines on DEN–RIW | 728 | 81.9% | 91 min | 0.82% | B+ |
| All carriers on DEN–RIW | 728 | 81.9% | 91 min | 0.82% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5018 quarter by quarter
OO 5018 did not run the same all year. Its best quarter was Oct–Dec 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 59.3%, a swing of 31 points on roughly 73 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 202530 flights83.3%
- Oct–Dec 202590 flights90.0%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights74.2%
- Jul–Sep 202662 flights59.3%
Scale runs 50% to 95%.
By weekday, OO 5018 did best on Saturday at 88.5% on time and worst on Friday at 62.0%. Each day rests on about 52 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5018 runs when it is late
OO 5018 often beats the schedule: 92 of 357 completed flights, 26%, arrived 15 minutes or more early. The 75 late arrivals split 23 under half an hour, 21 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early92 flights25.8%
- Within 15 min190 flights53.2%
- 15–29 min late23 flights6.4%
- 30–59 min late21 flights5.9%
- 1–2 hours late12 flights3.4%
- 2+ hours late19 flights5.3%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 70 departures that left 15 minutes late or more, only 5 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 5018
The latest arrival of the period was on 14 January 2026, 13 hours 4 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 January 2026 | 13 hours 4 minutes | Late-arriving aircraft |
| 28 November 2025 | 11 hours 49 minutes | Carrier |
| 2 June 2026 | 11 hours 21 minutes | Late-arriving aircraft |
| 4 May 2026 | 11 hours 6 minutes | Late-arriving aircraft |
| 12 January 2026 | 10 hours 27 minutes | Carrier |
Delay causes
Why OO 5018 runs late
Late-arriving aircraft accounts for 58% of the 8,676 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 24%Carrier
- 13%National Airspace System
- 5%Extreme weather
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,676 reported delay minutes here, that single category outweighs weather by 12 to one. The split is drawn from 8,676 delay minutes reported on OO 5018.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
8.7% 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 close to two hours, which a normal layover absorbs.
The same number turns up on five other city pairs in the data, including SHR to DEN (32), LAR to DEN (15) and PIR to DEN (9), but none flew often enough under OO 5018 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to RIW only.
One caution: this is a thin sample. 363 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 5018
For a booking, read OO 5018 as 79.0% on time with 1.10% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to RIW, every carrier and departure
- RIW to DEN, the return direction
- 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.