Flight number record

OO 4312

SkyWest Airlines · Butte to Salt Lake City

Route: BTM → SLC
Departs: 18:10
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4312, 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 4312 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 3.3 hours. That rests on 361 flights, with a median arrival 26 minutes early.

Set against the rest of the country, OO 4312'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

200 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 26 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 4312 flies

OO 4312 flies BTM to SLC without a single fixed slot. Its most common scheduled departure was 18:10, used on 266 of 361 flights, with 18:14 (66 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:10266 flights73.7%
Departs 18:1466 flights18.3%

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 18:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4312 runs 27 points better at 95.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4312 next to BTM to SLC

Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 4312 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4312thin sample	361	95.0%	200 min	0.55%	A+
All SkyWest Airlines on BTM–SLCthin sample	361	95.0%	200 min	0.55%	A+
All carriers on BTM–SLCthin sample	361	95.0%	200 min	0.55%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4312 quarter by quarter

Quarter by quarter OO 4312 held fairly steady: 93.5% in Jul–Sep 2025, 95.5% in Oct–Dec 2025, 98.9% in Jan–Mar 2026 and 92.1% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights93.5%
Oct–Dec 202589 flights95.5%
Jan–Mar 202689 flights98.9%
Apr–Jun 202691 flights92.1%

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

By weekday, OO 4312 ranged from 91.8% on Thursday to 98.0% on Monday. 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.

Delay causes

Why OO 4312 runs late

One category carries most of the weight here. Carrier accounts for 77% of the 3,598 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
77%
Extreme weather
19%
National Airspace System
4%

Extreme weather accounts for 19% 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 3.1 times the usual weather exposure. The split is drawn from 3,598 delay minutes reported on OO 4312.

Cancellations are rare at 0.55%, 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 2.5% 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 4312 is not only a BTM to SLC flight. It also flew SLC to BTM (361 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. 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.

Other routes flown as OO 4312
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to BTMthin sample	361	95.8%	56 min	0.55%	A+

What to do with this

Booking OO 4312

For a booking, OO 4312 has one of the better records a US domestic flight can show: 95.0% on time and 0.55% 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