Flight number record
OO 3973
SkyWest Airlines · Salt Lake City to Hailey
- Route
- SLC → SUN
- Departs
- 10:45
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3973, 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 3973 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 361 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 3973's record is 15 points better than the US average of 77.3%. That gap is worth roughly 151 fewer late arrivals for every thousand flights.
Key figures
On time
92.4%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 11 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 3973 flies
OO 3973 flies SLC to SUN without a single fixed slot. Its most common scheduled departure was 10:45, used on 86 of 361 flights, with 10:50 (77 flights) and 10:55 (71 flights) next.
- Departs 10:4586 flights23.8%
- Departs 10:5077 flights21.3%
- Departs 10:5571 flights19.7%
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 10:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 3973 runs 9 points better at 92.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 3973 next to SLC to SUN
Every carrier on SLC to SUN combined arrived on time 93.5% of the time across 1,078 flights, so OO 3973 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3973thin sample | 361 | 92.4% | 64 min | 0.55% | A+ |
| All SkyWest Airlines on SLC–SUN | 1,078 | 93.5% | 52 min | 0.74% | A+ |
| All carriers on SLC–SUN | 1,078 | 93.5% | 52 min | 0.74% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3973 quarter by quarter
Quarter by quarter OO 3973 held fairly steady: 100.0% in Jul–Sep 2025, 92.0% in Oct–Dec 2025, 92.1% in Jan–Mar 2026, 91.9% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202591 flights92.0%
- Jan–Mar 202690 flights92.1%
- Apr–Jun 202688 flights91.9%
- Jul–Sep 202662 flights90.3%
Scale runs 80% to 100%.
By weekday, OO 3973 ranged from 89.8% on Thursday to 98.0% on Tuesday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 3973 runs when it is late
OO 3973 often beats the schedule: 142 of 355 completed flights, 40%, arrived 15 minutes or more early. The 27 late arrivals split 9 under half an hour, 6 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early142 flights40.0%
- Within 15 min186 flights52.4%
- 15–29 min late9 flights2.5%
- 30–59 min late6 flights1.7%
- 1–2 hours late7 flights2.0%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
6 of 29 late departures made up the time and arrived on time, 21% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for OO 3973
The latest arrival of the period was on 15 April 2026, 2 hours 38 minutes behind schedule; most of its delay minutes were filed as extreme weather. 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 |
|---|---|---|
| 15 April 2026 | 2 hours 38 minutes | Extreme weather |
| 17 July 2026 | 2 hours 36 minutes | Carrier |
| 20 April 2026 | 2 hours 30 minutes | Carrier |
| 21 December 2025 | 2 hours 26 minutes | Extreme weather |
| 30 November 2025 | 2 hours 1 minute | Carrier |
Delay causes
Why OO 3973 runs late
Carrier accounts for 64% of the 1,737 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Carrier
- 32%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 32% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 5.3 times the usual weather exposure. The split is drawn from 1,737 delay minutes reported on OO 3973.
Cancellations are rare at 0.55%, 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
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
Every one of the 361 flights under OO 3973 in the data flew SLC 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. 361 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 3973
For a booking, OO 3973 has one of the better records a US domestic flight can show: 92.4% on time and 0.55% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SLC to SUN, every carrier and departure
- SUN to SLC, the return direction
- SkyWest Airlines 3985 on the same route96.0%
- Salt Lake City International (SLC) 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.