Flight number record

OO 4819

SkyWest Airlines · Dallas-Fort Worth to St. George

Route: DFW → SGU
Departs: 08:20
Flights: 351
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4819, 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 4819 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 351 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.6%, so OO 4819 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.

On time

73.6%

Arrivals under 15 minutes late, of 349 completed flights

Avg delay

90 min

Across delayed arrivals only, not all flights

Cancelled

0.28%

National rate is 1.81%

1 hour+ late

11.5%

National rate is 8.1%

These figures cover 351 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 4819 flies

OO 4819 flies DFW to SGU without a single fixed slot. Its most common scheduled departure was 08:20, used on 95 of 351 flights, with 08:25 (56 flights) and 08:30 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:2095 flights27.1%
Departs 08:2556 flights16.0%
Departs 08:3038 flights10.8%

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 08:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4819 runs 11 points worse at 73.6%. 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 4819 next to DFW to SGU

Every carrier on DFW to SGU combined arrived on time 75.2% of the time across 716 flights, so OO 4819 is 2 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 5 points.

OO 4819 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4819thin sample	351	73.6%	90 min	0.28%	C+
All SkyWest Airlines on DFW–SGU	716	75.2%	84 min	0.56%	B+
All carriers on DFW–SGU	716	75.2%	84 min	0.56%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4819 quarter by quarter

OO 4819 did not run the same all year. Its best quarter was Jul–Sep 2025 at 80.0% on time and its weakest Apr–Jun 2026 at 60.8%, a swing of 19 points on roughly 88 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 202591 flights80.0%
Oct–Dec 202591 flights79.1%
Jan–Mar 202690 flights73.0%
Apr–Jun 202679 flights60.8%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4819 ranged from 67.3% on Sunday to 76.9% on Monday. With about 50 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 4819 runs late

One category carries most of the weight here. Carrier accounts for 44% of the 8,278 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
44%
Late-arriving aircraft
22%
Extreme weather
21%
National Airspace System
13%

Extreme weather accounts for 21% 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 3.4 times the usual weather exposure. The split is drawn from 8,278 delay minutes reported on OO 4819.

Cancellations are rare at 0.28%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 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 351 flights under OO 4819 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. 351 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 4819

For a booking, read OO 4819 as 73.6% on time with 0.28% cancelled over 351 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures