Flight number record
OO 5554
SkyWest Airlines · Denver to Hailey
- Route
- DEN → SUN
- Departs
- 11:30
- Flights
- 362
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5554, 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 5554 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 362 flights, with a median arrival 8 minutes early.
Set against the rest of the country, OO 5554's record is 10 points better than the US average of 77.6%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.
Key figures
On time
87.7%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
5.9%
National rate is 8.1%
These figures cover 362 flights between July 2025 and June 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.
Schedule
When OO 5554 flies
OO 5554 flies DEN to SUN without a single fixed slot. Its most common scheduled departure was 11:30, used on 130 of 362 flights, with 11:31 (68 flights) and 11:33 (58 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 11:30130 flights35.9%
- Departs 11:3168 flights18.8%
- Departs 11:3358 flights16.0%
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 11:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5554 runs 9 points better at 87.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
OO 5554 next to DEN to SUN
Every carrier on DEN to SUN combined arrived on time 81.2% of the time across 631 flights, so OO 5554 is 7 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5554thin sample | 362 | 87.7% | 72 min | 0.00% | A+ |
| All SkyWest Airlines on DEN–SUN | 631 | 81.2% | 80 min | 0.00% | B+ |
| All carriers on DEN–SUN | 631 | 81.2% | 80 min | 0.00% | B+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 5554 quarter by quarter
Quarter by quarter OO 5554 held fairly steady: 93.4% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 86.5% in Jan–Mar 2026 and 86.2% in Apr–Jun 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 202592 flights93.4%
- Oct–Dec 202592 flights84.6%
- Jan–Mar 202690 flights86.5%
- Apr–Jun 202688 flights86.2%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5554 did best on Tuesday at 92.3% on time and worst on Sunday at 78.8%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 5554 runs late
One category carries most of the weight here. Carrier accounts for 54% of the 3,152 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.
- 54%Carrier
- 25%National Airspace System
- 18%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 54%, 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 1,705 of the 3,152 delay minutes reported here. The split is drawn from 3,152 delay minutes reported on OO 5554.
Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.9% 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 a little over an hour, which a normal layover absorbs.
The 557 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 362 flights under OO 5554 in the data flew DEN to SUN. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 362 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 5554
For a booking, OO 5554 has one of the better records a US domestic flight can show: 87.7% on time and 0.00% cancelled. That is a base rate, not a promise about any single 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
- Worst months to fly in the US, ranked by the data
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.