Flight number record
OO 5556
SkyWest Airlines · Denver to Rapid City
- Route
- DEN → RAP
- Departs
- 13:25
- Flights
- 288
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5556, 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 5556 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 288 flights, with a median arrival 8 minutes early.
Set against the rest of the country, OO 5556's record is 6 points better than the US average of 77.3%. That gap is worth roughly 60 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.74%
National rate is 1.89%
1 hour+ late
6.0%
National rate is 8.3%
These figures cover 288 flights between September 2025 and August 2026. The median arrival is 8 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 5556 flies
OO 5556 flies DEN to RAP without a single fixed slot. Its most common scheduled departure was 13:25, used on 175 of 288 flights, with 13:55 (58 flights) next.
- Departs 13:25175 flights60.8%
- Departs 13:5558 flights20.1%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5556 runs 5 points better at 83.3%. 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 5556 next to DEN to RAP
Every carrier on DEN to RAP combined arrived on time 77.7% of the time across 2,844 flights, so OO 5556 is 6 points ahead of it. SkyWest flew 2,081 flights on the same city pair under all its flight numbers, including this one, and those ran 78.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5556thin sample | 288 | 83.3% | 65 min | 1.74% | B |
| All SkyWest Airlines on DEN–RAP | 2,081 | 78.4% | 80 min | 1.25% | B |
| All carriers on DEN–RAP | 2,844 | 77.7% | 78 min | 0.95% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5556 quarter by quarter
OO 5556 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 73.8%, a swing of 16 points on roughly 58 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 flights90.0%
- Oct–Dec 202575 flights87.5%
- Jan–Mar 202663 flights73.8%
- Apr–Jun 202662 flights78.7%
- Jul–Sep 202658 flights89.5%
Scale runs 65% to 95%.
By weekday, OO 5556 did best on Monday at 90.7% on time and worst on Tuesday at 78.0%. Each day rests on about 41 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5556 runs when it is late
OO 5556 often beats the schedule: 71 of 281 completed flights, 25%, arrived 15 minutes or more early. The 47 late arrivals split 17 under half an hour, 13 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early71 flights25.3%
- Within 15 min163 flights58.0%
- 15–29 min late17 flights6.0%
- 30–59 min late13 flights4.6%
- 1–2 hours late8 flights2.8%
- 2+ hours late9 flights3.2%
Scale runs 0% to 100%.
Share of 281 completed flights by arrival against schedule.
5 of 40 late departures made up the time and arrived on time, 13% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for OO 5556
The latest arrival of the period was on 19 December 2025, 3 hours 40 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 |
|---|---|---|
| 19 December 2025 | 3 hours 40 minutes | Late-arriving aircraft |
| 27 December 2025 | 3 hours 36 minutes | Late-arriving aircraft |
| 5 May 2026 | 3 hours 30 minutes | Late-arriving aircraft |
| 18 February 2026 | 2 hours 58 minutes | Carrier |
| 17 February 2026 | 2 hours 16 minutes | National Airspace System |
Delay causes
Why OO 5556 runs late
Late-arriving aircraft accounts for 43% of the 3,072 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 43%Carrier
- 13%National Airspace System
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,072 reported delay minutes here, that single category outweighs weather by 43 to one. The split is drawn from 3,072 delay minutes reported on OO 5556.
Cancellations sit at 1.74% against a national 1.89%, which is ordinary. Diversions add another 0.69%.
Connections and routes
What a delay on this flight costs
6.0% 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 four other city pairs in the data, including LBB to DEN (20), ORD to MKE (16) and TUL to ORD (4), but none flew often enough under OO 5556 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to RAP only.
One caution: this is a thin sample. 288 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 5556
For a booking, read OO 5556 as 83.3% on time with 1.74% cancelled over 288 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to RAP, every carrier and departure
- RAP to DEN, the return direction
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- 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.