Flight number record

OO 3973

SkyWest Airlines · Salt Lake City to Hailey

Route: SLC → SUN
Departs: 10:45
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 3973's record is 15 points better than the US average of 77.6%. That gap is worth roughly 151 fewer late arrivals for every thousand flights.

On time

92.7%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

3.1%

National rate is 8.1%

These figures cover 361 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 3973 flies

OO 3973 flies SLC to SUN without a single fixed slot. Its most common scheduled departure was 10:45, used on 148 of 361 flights, with 10:50 (77 flights) and 10:55 (71 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:45148 flights41.0%
Departs 10:5077 flights21.3%
Departs 10:5571 flights19.7%

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 10:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3973 runs 9 points better at 92.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3973 next to SLC to SUN

Every carrier on SLC to SUN combined arrived on time 94.2% of the time across 1,078 flights, so OO 3973 is 2 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 14 points.

OO 3973 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3973thin sample	361	92.7%	68 min	0.55%	A+
All SkyWest Airlines on SLC–SUN	1,078	94.2%	54 min	0.74%	A+
All carriers on SLC–SUN	1,078	94.2%	54 min	0.74%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3973 quarter by quarter

Quarter by quarter OO 3973 held fairly steady: 94.6% in Jul–Sep 2025, 92.0% in Oct–Dec 2025, 92.1% in Jan–Mar 2026 and 91.9% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights94.6%
Oct–Dec 202591 flights92.0%
Jan–Mar 202690 flights92.1%
Apr–Jun 202688 flights91.9%

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

By weekday, OO 3973 ranged from 88.2% on Sunday to 98.1% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3973 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 1,769 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
64%
Extreme weather
32%
National Airspace System
4%

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 5.1 times the usual weather exposure. The split is drawn from 1,769 delay minutes reported on OO 3973.

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 3.1% 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.

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: 92.7% 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