Flight number record

OO 4819

SkyWest Airlines · Dallas-Fort Worth to St. George

Route: DFW → SGU
Departs: 08:20
Flights: 339
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. The late ones land an hour and a half behind schedule. That rests on 339 flights, with a median arrival 7 minutes early.

On time

73.6%

Arrivals under 15 minutes late, of 337 completed flights

Avg delay

86 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.89%

1 hour+ late

10.7%

National rate is 8.3%

These figures cover 339 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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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 96 of 339 flights, with 08:25 (56 flights) and 08:40 (48 flights) next.

Departs 08:2096 flights28.3%
Departs 08:2556 flights16.5%
Departs 08:4048 flights14.2%

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 08:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4819 runs 10 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.

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Against the route

OO 4819 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 4819 is 2 points behind it. Across its whole network SkyWest Airlines managed 78.7%, 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	339	73.6%	86 min	0.29%	C+
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 4819 quarter by quarter

OO 4819 did not run the same all year. Its best quarter was Jul–Sep 2026 at 81.6% on time and its weakest Apr–Jun 2026 at 60.8%, a swing of 21 points on roughly 85 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 202591 flights79.1%
Jan–Mar 202690 flights73.0%
Apr–Jun 202679 flights60.8%
Jul–Sep 202649 flights81.6%

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

By weekday, OO 4819 ranged from 69.4% on Thursday to 80.4% on Friday. With about 48 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 4819 runs when it is late

OO 4819 often beats the schedule: 106 of 337 completed flights, 31%, arrived 15 minutes or more early. The 89 late arrivals split 23 under half an hour, 30 between 30 and 60 minutes, and 36 an hour or more.

15+ min early106 flights31.5%
Within 15 min142 flights42.1%
15–29 min late23 flights6.8%
30–59 min late30 flights8.9%
1–2 hours late23 flights6.8%
2+ hours late13 flights3.9%

Scale runs 0% to 100%.

Share of 337 completed flights by arrival against schedule.

14 of 93 late departures made up the time and arrived on time, 15% of them. 10 flights left on time and still arrived late.

The worst days

Worst days for OO 4819

The latest arrival of the period was on 29 June 2026, 9 hours 11 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across June, January, November and February, with no single month standing out.

The latest arrivals of OO 4819 in the period
Date	Arrived late by	Largest filed cause
29 June 2026	9 hours 11 minutes	Late-arriving aircraft
25 January 2026	7 hours 55 minutes	Extreme weather
20 November 2025	7 hours 27 minutes	National Airspace System
19 June 2026	6 hours 33 minutes	Carrier
15 February 2026	6 hours 27 minutes	Carrier

Delay causes

Why OO 4819 runs late

Carrier accounts for 45% of the 7,691 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
45%
Late-arriving aircraft
25%
Extreme weather
18%
National Airspace System
12%

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 7,691 delay minutes reported on OO 4819.

Cancellations are rare at 0.29%, 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

10.7% 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 339 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. 339 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 0.29% cancelled over 339 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