Flight number record

OO 4317

SkyWest Airlines · Salt Lake City to Elko

Route: SLC → EKO
Departs: 21:30
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4317, 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 4317 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 77.3%. When something does go wrong the average delay runs about 4.2 hours. That rests on 364 flights, with a median arrival 18 minutes early.

Set against the rest of the country, OO 4317's record is 17 points better than the US average of 77.3%. That gap is worth roughly 171 fewer late arrivals for every thousand flights.

On time

94.4%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

251 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.89%

1 hour+ late

3.3%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 18 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 4317 flies

OO 4317 is scheduled to leave Salt Lake City (SLC) at 21:30 local time and reach Elko (EKO) at 21:34. That slot held for 322 of the 364 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 21:30322 flights88.5%
Departs 17:3040 flights11.0%

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 21:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4317 runs 24 points better at 94.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 4317 next to SLC to EKO

Every carrier on SLC to EKO combined arrived on time 92.7% of the time across 579 flights, so OO 4317 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 16 points.

OO 4317 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4317thin sample	364	94.4%	251 min	0.82%	A+
All SkyWest Airlines on SLC–EKO	579	92.7%	150 min	0.69%	A+
All carriers on SLC–EKO	579	92.7%	150 min	0.69%	A+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 4317 quarter by quarter

Quarter by quarter OO 4317 held fairly steady: 96.7% in Jul–Sep 2025, 96.7% in Oct–Dec 2025, 95.4% in Jan–Mar 2026, 88.9% in Apr–Jun 2026 and 96.8% in Jul–Sep 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 202530 flights96.7%
Oct–Dec 202591 flights96.7%
Jan–Mar 202690 flights95.4%
Apr–Jun 202691 flights88.9%
Jul–Sep 202662 flights96.8%

Scale runs 80% to 100%.

By weekday, OO 4317 ranged from 88.2% on Friday to 100.0% on Sunday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 4317 runs when it is late

OO 4317 often beats the schedule: 238 of 360 completed flights, 66%, arrived 15 minutes or more early. When OO 4317 is late it tends to be very late: 12 of its 20 late arrivals were an hour or more behind, and 7 were two hours or more.

15+ min early238 flights66.1%
Within 15 min102 flights28.3%
15–29 min late2 flights0.6%
30–59 min late6 flights1.7%
1–2 hours late5 flights1.4%
2+ hours late7 flights1.9%

Scale runs 0% to 100%.

Share of 360 completed flights by arrival against schedule.

3 of 22 late departures made up the time and arrived on time, 14% of them. Only 1 left on time and still arrived late.

The worst days

Worst days for OO 4317

The latest arrival of the period was on 12 June 2026, 15 hours 26 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of OO 4317 in the period
Date	Arrived late by	Largest filed cause
12 June 2026	15 hours 26 minutes	Carrier
24 February 2026	13 hours 7 minutes	Extreme weather
16 April 2026	10 hours 20 minutes	Carrier
17 April 2026	10 hours 13 minutes	Carrier
29 May 2026	9 hours 50 minutes	Carrier

Delay causes

Why OO 4317 runs late

Carrier accounts for 82% of the 5,010 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
82%
Extreme weather
18%
National Airspace System
0%

Extreme weather accounts for 18% 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 3.0 times the usual weather exposure. The split is drawn from 5,010 delay minutes reported on OO 4317.

Cancellations are rare at 0.82%, 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 3.3% 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.

Every one of the 364 flights under OO 4317 in the data flew SLC to EKO. 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. 364 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 4317

For a booking, OO 4317 has one of the better records a US domestic flight can show: 94.4% on time and 0.82% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures