Flight number record

OO 4817

SkyWest Airlines · Dallas-Fort Worth to St. George

Route: DFW → SGU
Departs: 21:14
Flights: 359
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4817, 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 4817 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 359 flights, with a median arrival 9 minutes early.

On time

78.3%

Arrivals under 15 minutes late, of 351 completed flights

Avg delay

85 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.89%

1 hour+ late

9.1%

National rate is 8.3%

These figures cover 359 flights between September 2025 and August 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When OO 4817 flies

OO 4817 flies DFW to SGU without a single fixed slot. Its most common scheduled departure was 21:14, used on 69 of 359 flights, with 19:05 (54 flights) and 19:00 (45 flights) next.

Departs 21:1469 flights19.2%
Departs 19:0554 flights15.0%
Departs 19:0045 flights12.5%

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 21:14 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4817 runs 8 points better at 78.3%. 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 4817 next to DFW to SGU

Every carrier on DFW to SGU combined arrived on time 76.0% of the time across 698 flights, so OO 4817 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.

OO 4817 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4817thin sample	359	78.3%	85 min	0.56%	B+
All SkyWest Airlines on DFW–SGU	698	76.0%	86 min	0.43%	B+
All carriers on DFW–SGU	698	76.0%	86 min	0.43%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 4817 quarter by quarter

OO 4817 did not run the same all year. Its best quarter was Oct–Dec 2025 at 87.0% on time and its weakest Apr–Jun 2026 at 67.8%, a swing of 19 points on roughly 90 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202530 flights—
Oct–Dec 202592 flights87.0%
Jan–Mar 202690 flights85.2%
Apr–Jun 202691 flights67.8%
Jul–Sep 202656 flights70.9%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4817 did best on Tuesday at 90.0% on time and worst on Wednesday at 72.0%. Each day rests on about 51 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 4817 runs when it is late

OO 4817 often beats the schedule: 121 of 351 completed flights, 34%, arrived 15 minutes or more early. The 76 late arrivals split 25 under half an hour, 19 between 30 and 60 minutes, and 32 an hour or more.

15+ min early121 flights34.5%
Within 15 min154 flights43.9%
15–29 min late25 flights7.1%
30–59 min late19 flights5.4%
1–2 hours late17 flights4.8%
2+ hours late15 flights4.3%

Scale runs 0% to 100%.

Share of 351 completed flights by arrival against schedule.

12 of 76 late departures made up the time and arrived on time, 16% of them. 12 flights left on time and still arrived late.

The worst days

Worst days for OO 4817

The latest arrival of the period was on 27 August 2026, 10 hours 35 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across August, January, June and February, with no single month standing out.

The latest arrivals of OO 4817 in the period
Date	Arrived late by	Largest filed cause
27 August 2026	10 hours 35 minutes	Extreme weather
25 January 2026	8 hours 54 minutes	Extreme weather
29 June 2026	5 hours 28 minutes	Late-arriving aircraft
15 February 2026	4 hours 51 minutes	Carrier
20 June 2026	4 hours 42 minutes	Late-arriving aircraft

Delay causes

Why OO 4817 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,465 reported delay minutes.

Carrier
38%
Extreme weather
31%
Late-arriving aircraft
24%
National Airspace System
7%
Security
1%

Extreme weather accounts for 31% 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 6,465 delay minutes reported on OO 4817.

Cancellations are rare at 0.56%, 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

9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The 976 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.

Every one of the 359 flights under OO 4817 in the data flew DFW to SGU. 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. 359 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 4817

For a booking, read OO 4817 as 78.3% on time with 0.56% cancelled over 359 flights. Those are rates from the past twelve months, not a forecast for any particular 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