Flight number record

OO 5221

SkyWest Airlines · Amarillo to Denver

Route: AMA → DEN
Departs: 08:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5221, 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 5221 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 77.6%. When something does go wrong the average delay runs about 2.2 hours. That rests on 365 flights, with a median arrival 17 minutes early.

Set against the rest of the country, OO 5221's record is 9 points better than the US average of 77.6%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.

On time

86.9%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

133 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

6.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 17 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.

Schedule

When OO 5221 flies

OO 5221 is scheduled to leave Amarillo (AMA) at 08:00 local time and reach Denver (DEN) at 08:39. That slot held for 309 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 08:00309 flights84.7%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 5221 runs 3 points better at 86.9%. 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 5221 next to AMA to DEN

Every carrier on AMA to DEN combined arrived on time 77.3% of the time across 689 flights, so OO 5221 is 10 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 8 points.

OO 5221 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5221	365	86.9%	133 min	1.10%	A
All SkyWest Airlines on AMA–DEN	689	77.3%	96 min	2.03%	B
All carriers on AMA–DEN	689	77.3%	96 min	2.03%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5221 quarter by quarter

OO 5221 did not run the same all year. Its best quarter was Apr–Jun 2026 at 98.9% on time and its weakest Oct–Dec 2025 at 79.1%, a swing of 20 points on roughly 91 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 202592 flights79.3%
Oct–Dec 202592 flights79.1%
Jan–Mar 202690 flights90.7%
Apr–Jun 202691 flights98.9%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5221 did best on Tuesday at 94.3% on time and worst on Saturday at 78.0%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5221 runs late

One category carries most of the weight here. Carrier accounts for 86% of the 6,226 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
86%
National Airspace System
7%
Late-arriving aircraft
5%
Extreme weather
2%

The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 5,362 of the 6,226 delay minutes reported here. The split is drawn from 6,226 delay minutes reported on OO 5221.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

6.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 2.2 hours, which a normal layover absorbs.

Every one of the 365 flights under OO 5221 in the data flew AMA to DEN. 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. 365 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 5221

For a booking, OO 5221 has one of the better records a US domestic flight can show: 86.9% on time and 1.10% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures