Flight number record
OO 5554
SkyWest Airlines · Denver to Hailey
- Route
- DEN → SUN
- Departs
- 11:30
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 362 flights, with a median arrival 7 minutes early.
Set against the rest of the country, OO 5554's record is 8 points better than the US average of 77.3%. That gap is worth roughly 82 fewer late arrivals for every thousand flights.
Key figures
On time
85.5%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
6.4%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 7 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 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 11:44 (79 flights) and 11:33 (58 flights) next.
- Departs 11:30130 flights35.9%
- Departs 11:4479 flights21.8%
- Departs 11:3358 flights16.0%
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 11:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5554 runs 7 points better at 85.5%. 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 5554 next to DEN to SUN
Every carrier on DEN to SUN combined arrived on time 80.7% of the time across 630 flights, so OO 5554 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5554thin sample | 362 | 85.5% | 70 min | 0.00% | A+ |
| All SkyWest Airlines on DEN–SUN | 630 | 80.7% | 85 min | 0.00% | B+ |
| All carriers on DEN–SUN | 630 | 80.7% | 85 min | 0.00% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5554 quarter by quarter
OO 5554 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 80.6%, a swing of 13 points on roughly 72 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 202592 flights84.6%
- Jan–Mar 202690 flights86.5%
- Apr–Jun 202688 flights86.2%
- Jul–Sep 202662 flights80.6%
Scale runs 70% to 100%.
By weekday, OO 5554 did best on Tuesday at 92.2% on time and worst on Sunday at 75.0%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5554 runs when it is late
OO 5554 often beats the schedule: 117 of 359 completed flights, 33%, arrived 15 minutes or more early. The 52 late arrivals split 10 under half an hour, 19 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early117 flights32.6%
- Within 15 min190 flights52.9%
- 15–29 min late10 flights2.8%
- 30–59 min late19 flights5.3%
- 1–2 hours late17 flights4.7%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
8 of 48 late departures made up the time and arrived on time, 17% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for OO 5554
The latest arrival of the period was on 19 December 2025, 4 hours 35 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 4 hours 35 minutes | National Airspace System |
| 6 March 2026 | 3 hours 36 minutes | Carrier |
| 21 June 2026 | 3 hours 36 minutes | Carrier |
| 6 August 2026 | 3 hours 10 minutes | Late-arriving aircraft |
| 9 June 2026 | 3 hours 1 minute | Carrier |
Delay causes
Why OO 5554 runs late
Carrier accounts for 52% of the 3,618 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 25%National Airspace System
- 20%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,868 of the 3,618 delay minutes reported here. The split is drawn from 3,618 delay minutes reported on OO 5554.
Cancellations are rare at 0.00%, below the national 1.89% 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
6.4% 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 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.
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: 85.5% 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.