Flight number record
OO 3845
SkyWest Airlines · Salt Lake City to Great Falls
- Route
- SLC → GTF
- Departs
- 20:55
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3845, 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 3845 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 19 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 35 minutes. That rests on 364 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 3845's record is 19 points better than the US average of 77.3%. That gap is worth roughly 186 fewer late arrivals for every thousand flights.
Key figures
On time
95.9%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
35 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
0.3%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 14 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 3845 flies
OO 3845 flies SLC to GTF without a single fixed slot. Its most common scheduled departure was 20:55, used on 117 of 364 flights, with 21:05 (85 flights) and 20:50 (82 flights) next.
- Departs 20:55117 flights32.1%
- Departs 21:0585 flights23.4%
- Departs 20:5082 flights22.5%
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 20:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 3845 runs 26 points better at 95.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 3845 next to SLC to GTF
Every carrier on SLC to GTF combined arrived on time 93.4% of the time across 1,072 flights, so OO 3845 is 3 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3845thin sample | 364 | 95.9% | 35 min | 0.27% | A+ |
| All SkyWest Airlines on SLC–GTF | 1,072 | 93.4% | 52 min | 0.75% | A+ |
| All carriers on SLC–GTF | 1,072 | 93.4% | 52 min | 0.75% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3845 quarter by quarter
Quarter by quarter OO 3845 held fairly steady: 93.3% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 96.6% in Jan–Mar 2026, 97.8% in Apr–Jun 2026 and 96.8% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights93.4%
- Jan–Mar 202690 flights96.6%
- Apr–Jun 202691 flights97.8%
- Jul–Sep 202662 flights96.8%
Scale runs 85% to 100%.
By weekday, OO 3845 ranged from 94.1% on Sunday to 100.0% on Thursday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 3845 runs when it is late
OO 3845 often beats the schedule: 165 of 362 completed flights, 46%, arrived 15 minutes or more early. The 15 late arrivals split 7 under half an hour, 7 between 30 and 60 minutes, and 1 an hour or more. Not one arrived two hours late.
- 15+ min early165 flights45.6%
- Within 15 min182 flights50.3%
- 15–29 min late7 flights1.9%
- 30–59 min late7 flights1.9%
- 1–2 hours late1 flights0.3%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
A late pushback is often recovered here: of 20 departures that left 15 minutes late or more, 7 still arrived on time. Only 2 left on time and still arrived late.
The worst days
Worst days for OO 3845
The latest arrival of the period was on 24 January 2026, 1 hour 38 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 extreme weather.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 January 2026 | 1 hour 38 minutes | National Airspace System |
| 2 November 2025 | 56 minutes | Extreme weather |
| 8 September 2025 | 52 minutes | Carrier |
| 4 January 2026 | 46 minutes | Extreme weather |
| 18 February 2026 | 42 minutes | Extreme weather |
Delay causes
Why OO 3845 runs late
Carrier accounts for 45% of the 529 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 36%Extreme weather
- 19%National Airspace System
Extreme weather accounts for 36% 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 5.9 times the usual weather exposure. The split is drawn from 529 delay minutes reported on OO 3845.
Cancellations are rare at 0.27%, 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 0.3% 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 364 flights under OO 3845 in the data flew SLC to GTF. 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. 364 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 3845
For a booking, OO 3845 has one of the better records a US domestic flight can show: 95.9% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SLC to GTF, every carrier and departure
- GTF to SLC, the return direction
- SkyWest Airlines 3859 on the same route95.0%
- SkyWest Airlines 3800 on the same route89.1%
- 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
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.