Flight number record
OO 5506
SkyWest Airlines · Denver to Arcata/Eureka
- Route
- DEN → ACV
- Departs
- 11:20
- Flights
- 311
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5506, 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 5506 lands a B+, 3 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 a little over an hour on average. That rests on 311 flights, with a median arrival 5 minutes early.
Key figures
On time
80.3%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.32%
National rate is 1.89%
1 hour+ late
8.7%
National rate is 8.3%
These figures cover 311 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 5506 flies
OO 5506 flies DEN to ACV without a single fixed slot. Its most common scheduled departure was 11:20, used on 124 of 311 flights, with 11:15 (92 flights) next.
- Departs 11:20124 flights39.9%
- Departs 11:1592 flights29.6%
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 11:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5506 runs 2 points better at 80.3%. 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 5506 next to DEN to ACV
Every carrier on DEN to ACV combined arrived on time 78.9% of the time across 364 flights, so OO 5506 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5506thin sample | 311 | 80.3% | 70 min | 0.32% | B+ |
| All SkyWest Airlines on DEN–ACVthin sample | 364 | 78.9% | 65 min | 0.27% | B+ |
| All carriers on DEN–ACVthin sample | 364 | 78.9% | 65 min | 0.27% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5506 quarter by quarter
OO 5506 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 70.9%, a swing of 22 points on roughly 62 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 flights93.3%
- Oct–Dec 202591 flights90.0%
- Jan–Mar 202687 flights70.9%
- Apr–Jun 202641 flights73.2%
- Jul–Sep 202662 flights77.4%
Scale runs 60% to 100%.
By weekday, OO 5506 did best on Wednesday at 95.2% on time and worst on Friday at 68.9%. Each day rests on about 44 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5506 runs when it is late
OO 5506 often beats the schedule: 82 of 309 completed flights, 27%, arrived 15 minutes or more early. The 61 late arrivals split 19 under half an hour, 15 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early82 flights26.5%
- Within 15 min166 flights53.7%
- 15–29 min late19 flights6.1%
- 30–59 min late15 flights4.9%
- 1–2 hours late15 flights4.9%
- 2+ hours late12 flights3.9%
Scale runs 0% to 100%.
Share of 309 completed flights by arrival against schedule.
7 of 46 late departures made up the time and arrived on time, 15% of them. In the other direction, 22 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 ACV.
The worst days
Worst days for OO 5506
The latest arrival of the period was on 2 January 2026, 4 hours 56 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 |
|---|---|---|
| 2 January 2026 | 4 hours 56 minutes | Late-arriving aircraft |
| 21 March 2026 | 4 hours 9 minutes | Carrier |
| 6 March 2026 | 3 hours 58 minutes | Carrier |
| 19 December 2025 | 3 hours 20 minutes | Late-arriving aircraft |
| 14 August 2026 | 3 hours 6 minutes | Late-arriving aircraft |
Delay causes
Why OO 5506 runs late
Carrier accounts for 46% of the 4,292 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 37%Late-arriving aircraft
- 16%National Airspace System
- 1%Extreme weather
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,292 reported delay minutes here, that single category outweighs weather by 37 to one. The split is drawn from 4,292 delay minutes reported on OO 5506.
Cancellations are rare at 0.32%, below the national 1.89% 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
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 a little over an hour, which a normal layover absorbs.
The 1,026 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on four other city pairs in the data, including ACV to LAX (35), IND to ORD (28) and GSO to ORD (19), but none flew often enough under OO 5506 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ACV only.
One caution: this is a thin sample. 311 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 5506
For a booking, read OO 5506 as 80.3% on time with 0.32% cancelled over 311 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- 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.