Flight number record

OO 3721

SkyWest Airlines · Salt Lake City to Eugene

Route: SLC → EUG
Departs: 22:45
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3721, 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 3721 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 365 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 3721's record is 17 points better than the US average of 77.6%. That gap is worth roughly 169 fewer late arrivals for every thousand flights.

On time

94.5%

Arrivals under 15 minutes late, of 365 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

1.6%

National rate is 8.1%

These figures cover 365 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 3721 flies

OO 3721 flies SLC to EUG without a single fixed slot. Its most common scheduled departure was 22:45, used on 154 of 365 flights, with 21:50 (70 flights) and 22:50 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:45154 flights42.2%
Departs 21:5070 flights19.2%
Departs 22:5048 flights13.2%

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 22:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 3721 runs 24 points better at 94.5%. 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 3721 next to SLC to EUG

Every carrier on SLC to EUG combined arrived on time 93.5% of the time across 739 flights, so OO 3721 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 3721 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3721	365	94.5%	60 min	0.00%	A+
All SkyWest Airlines on SLC–EUG	739	93.5%	58 min	0.00%	A+
All carriers on SLC–EUG	739	93.5%	58 min	0.00%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3721 quarter by quarter

Quarter by quarter OO 3721 held fairly steady: 95.7% in Jul–Sep 2025, 97.8% in Oct–Dec 2025, 94.4% in Jan–Mar 2026 and 90.1% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights95.7%
Oct–Dec 202592 flights97.8%
Jan–Mar 202690 flights94.4%
Apr–Jun 202691 flights90.1%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3721 did best on Saturday at 100.0% on time and worst on Thursday at 86.5%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3721 runs late

One category carries most of the weight here. Carrier accounts for 88% of the 1,196 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
88%
National Airspace System
6%
Extreme weather
6%

The largest share of delay minutes, 88%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,053 of the 1,196 delay minutes reported here. The split is drawn from 1,196 delay minutes reported on OO 3721.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are 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 1.6% 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.

The 618 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 365 flights under OO 3721 in the data flew SLC to EUG. 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. 365 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 3721

For a booking, OO 3721 has one of the better records a US domestic flight can show: 94.5% on time and 0.00% 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