Flight number record

OO 5378

SkyWest Airlines · Denver to Sioux Falls

Route: DEN → FSD
Departs: 13:40
Flights: 362
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5378, 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 5378 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 362 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 5378's record is 9 points better than the US average of 77.3%. That gap is worth roughly 91 fewer late arrivals for every thousand flights.

On time

86.4%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

78 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.89%

1 hour+ late

7.2%

National rate is 8.3%

These figures cover 362 flights between September 2025 and August 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.

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Schedule

When OO 5378 flies

OO 5378 flies DEN to FSD without a single fixed slot. Its most common scheduled departure was 13:40, used on 123 of 362 flights, with 13:30 (81 flights) and 13:35 (51 flights) next.

Departs 13:40123 flights34.0%
Departs 13:3081 flights22.4%
Departs 13:3551 flights14.1%

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 13:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5378 runs 8 points better at 86.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

OO 5378 next to DEN to FSD

Every carrier on DEN to FSD combined arrived on time 82.8% of the time across 1,817 flights, so OO 5378 is 4 points ahead of it. SkyWest flew 1,313 flights on the same city pair under all its flight numbers, including this one, and those ran 85.5% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 8 points.

OO 5378 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5378thin sample	362	86.4%	78 min	0.83%	A+
All SkyWest Airlines on DEN–FSD	1,313	85.5%	78 min	0.99%	A+
All carriers on DEN–FSD	1,817	82.8%	80 min	0.94%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 5378 quarter by quarter

Quarter by quarter OO 5378 held fairly steady: 83.3% in Jul–Sep 2025, 85.2% in Oct–Dec 2025, 86.5% in Jan–Mar 2026, 87.9% in Apr–Jun 2026 and 86.9% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights83.3%
Oct–Dec 202590 flights85.2%
Jan–Mar 202690 flights86.5%
Apr–Jun 202691 flights87.9%
Jul–Sep 202661 flights86.9%

Scale runs 75% to 95%.

By weekday, OO 5378 ranged from 82.4% on Thursday to 90.4% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 5378 runs when it is late

OO 5378 often beats the schedule: 109 of 359 completed flights, 30%, arrived 15 minutes or more early. When OO 5378 is late it tends to be very late: 26 of its 49 late arrivals were an hour or more behind, and 11 were two hours or more.

15+ min early109 flights30.4%
Within 15 min201 flights56.0%
15–29 min late13 flights3.6%
30–59 min late10 flights2.8%
1–2 hours late15 flights4.2%
2+ hours late11 flights3.1%

Scale runs 0% to 100%.

Share of 359 completed flights by arrival against schedule.

9 of 49 late departures made up the time and arrived on time, 18% of them. 9 flights left on time and still arrived late.

The worst days

Worst days for OO 5378

The latest arrival of the period was on 6 March 2026, 4 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.

The latest arrivals of OO 5378 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	4 hours 33 minutes	Carrier
19 December 2025	3 hours 1 minute	Carrier
28 December 2025	2 hours 59 minutes	Late-arriving aircraft
19 March 2026	2 hours 49 minutes	Late-arriving aircraft
18 December 2025	2 hours 45 minutes	Extreme weather

Delay causes

Why OO 5378 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 3,835 reported delay minutes.

Carrier
41%
Late-arriving aircraft
30%
National Airspace System
18%
Extreme weather
11%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 3,835 delay minutes reported on OO 5378.

Cancellations are rare at 0.83%, 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

7.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

Every one of the 362 flights under OO 5378 in the data flew DEN to FSD. 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. 362 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 5378

For a booking, OO 5378 has one of the better records a US domestic flight can show: 86.4% on time and 0.83% 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