Flight number record

OO 3880

SkyWest Airlines · Helena to Salt Lake City

Route: HLN → SLC
Departs: 13:00
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 17 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 360 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 3880's record is 17 points better than the US average of 77.6%. That gap is worth roughly 174 fewer late arrivals for every thousand flights.

On time

95.0%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.81%

1 hour+ late

1.4%

National rate is 8.1%

These figures cover 360 flights between July 2025 and June 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.

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 149 of 360 flights, with 13:10 (62 flights) and 13:06 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:00149 flights41.4%
Departs 13:1062 flights17.2%
Departs 13:0640 flights11.1%

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 13:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 3880 runs 16 points better at 95.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 3880 next to HLN to SLC

Every carrier on HLN to SLC combined arrived on time 95.9% of the time across 725 flights, so OO 3880 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 3880 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3880thin sample	360	95.0%	57 min	0.56%	A+
All SkyWest Airlines on HLN–SLC	725	95.9%	72 min	0.28%	A+
All carriers on HLN–SLC	725	95.9%	72 min	0.28%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3880 quarter by quarter

Quarter by quarter OO 3880 held fairly steady: 97.8% in Jul–Sep 2025, 95.3% in Oct–Dec 2025, 93.3% in Jan–Mar 2026 and 93.4% in Apr–Jun 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 202592 flights97.8%
Oct–Dec 202588 flights95.3%
Jan–Mar 202689 flights93.3%
Apr–Jun 202691 flights93.4%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3880 ranged from 92.3% on Friday to 98.1% on Tuesday. With about 51 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.

Delay causes

Why OO 3880 runs late

One category carries most of the weight here. Carrier accounts for 67% of the 1,025 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.

Carrier
67%
Extreme weather
29%
National Airspace System
4%

Extreme weather accounts for 29% 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 4.6 times the usual weather exposure. The split is drawn from 1,025 delay minutes reported on OO 3880.

Cancellations are rare at 0.56%, below the national 1.81% 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 1.4% land an hour or more behind schedule, against 8.1% 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, 95.8% 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.

Other routes flown as OO 3880
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to HLNthin sample	360	95.8%	43 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: 95.0% on time and 0.56% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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.

Key figures