Flight number record
OO 3880
SkyWest Airlines · Helena to Salt Lake City
- Route
- HLN → SLC
- Departs
- 13:00
- Flights
- 360
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3880, 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 3880 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 360 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 3880's record is 16 points better than the US average of 77.3%. That gap is worth roughly 157 fewer late arrivals for every thousand flights.
Key figures
On time
93.0%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
1 hour+ late
2.0%
National rate is 8.3%
These figures cover 360 flights between September 2025 and August 2026. The median arrival is 10 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 3880 flies
OO 3880 flies HLN to SLC without a single fixed slot. Its most common scheduled departure was 13:00, used on 99 of 360 flights, with 13:10 (62 flights) and 12:55 (56 flights) next.
- Departs 13:0099 flights27.5%
- Departs 13:1062 flights17.2%
- Departs 12:5556 flights15.6%
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 13:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 3880 runs 15 points better at 93.0%. 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 3880 next to HLN to SLC
Every carrier on HLN to SLC combined arrived on time 95.4% of the time across 725 flights, so OO 3880 is 2 points behind 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 3880thin sample | 360 | 93.0% | 53 min | 0.56% | A+ |
| All SkyWest Airlines on HLN–SLC | 725 | 95.4% | 62 min | 0.28% | A+ |
| All carriers on HLN–SLC | 725 | 95.4% | 62 min | 0.28% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3880 quarter by quarter
Quarter by quarter OO 3880 held fairly steady: 96.7% in Jul–Sep 2025, 95.3% in Oct–Dec 2025, 93.3% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 87.1% 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 flights96.7%
- Oct–Dec 202588 flights95.3%
- Jan–Mar 202689 flights93.3%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights87.1%
Scale runs 80% to 100%.
By weekday, OO 3880 did best on Tuesday at 98.1% on time and worst on Friday at 84.6%. Each day rests on about 51 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3880 runs when it is late
OO 3880 often beats the schedule: 129 of 358 completed flights, 36%, arrived 15 minutes or more early. The 25 late arrivals split 12 under half an hour, 6 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early129 flights36.0%
- Within 15 min204 flights57.0%
- 15–29 min late12 flights3.4%
- 30–59 min late6 flights1.7%
- 1–2 hours late5 flights1.4%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 21 departures that left 15 minutes late or more, only 2 made it up before arrival. Only 6 left on time and still arrived late.
The worst days
Worst days for OO 3880
The latest arrival of the period was on 18 February 2026, 3 hours 31 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 February 2026 | 3 hours 31 minutes | Extreme weather |
| 17 October 2025 | 2 hours 14 minutes | Carrier |
| 15 July 2026 | 1 hour 49 minutes | Carrier |
| 23 March 2026 | 1 hour 47 minutes | Carrier |
| 30 July 2026 | 1 hour 42 minutes | Carrier |
Delay causes
Why OO 3880 runs late
Carrier accounts for 70% of the 1,328 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 25%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 25% 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 4.1 times the usual weather exposure. The split is drawn from 1,328 delay minutes reported on OO 3880.
Cancellations are rare at 0.56%, 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 2.0% 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.
OO 3880 is not only a HLN to SLC flight. It also flew SLC to HLN (360 flights, 94.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 360 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SLC to HLNthin sample | 360 | 94.1% | 42 min | 0.56% | A+ |
What to do with this
Booking OO 3880
For a booking, OO 3880 has one of the better records a US domestic flight can show: 93.0% on time and 0.56% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- HLN to SLC, every carrier and departure
- SLC to HLN, the return direction
- SkyWest Airlines 3901 on the same route97.8%
- 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.