Flight number record
OO 5221
SkyWest Airlines · Amarillo to Denver
- Route
- AMA → DEN
- Departs
- 08:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two 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 13 points better than the US average of 77.3%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.
Key figures
On time
90.0%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
117 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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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%.
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 83.9%, and OO 5221 runs 6 points better at 90.0%. 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 5221 next to AMA to DEN
Every carrier on AMA to DEN combined arrived on time 80.2% of the time across 682 flights, so OO 5221 is 10 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5221 | 365 | 90.0% | 117 min | 1.10% | A |
| All SkyWest Airlines on AMA–DEN | 682 | 80.2% | 93 min | 2.20% | B |
| All carriers on AMA–DEN | 682 | 80.2% | 93 min | 2.20% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 73 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 flights86.7%
- Oct–Dec 202592 flights79.1%
- Jan–Mar 202690 flights90.7%
- Apr–Jun 202691 flights98.9%
- Jul–Sep 202662 flights93.5%
Scale runs 70% to 100%.
By weekday, OO 5221 did best on Friday at 96.1% on time and worst on Saturday at 84.0%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5221 runs when it is late
OO 5221 often beats the schedule: 211 of 360 completed flights, 59%, arrived 15 minutes or more early. When OO 5221 is late it tends to be very late: 19 of its 36 late arrivals were an hour or more behind, and 9 were two hours or more.
- 15+ min early211 flights58.6%
- Within 15 min113 flights31.4%
- 15–29 min late11 flights3.1%
- 30–59 min late6 flights1.7%
- 1–2 hours late10 flights2.8%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
5 of 32 late departures made up the time and arrived on time, 16% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 5221
The latest arrival of the period was on 20 December 2025, 9 hours 58 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 October 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 December 2025 | 9 hours 58 minutes | Carrier |
| 7 October 2025 | 9 hours 52 minutes | Carrier |
| 20 October 2025 | 7 hours 16 minutes | Carrier |
| 1 October 2025 | 4 hours 4 minutes | Carrier |
| 26 January 2026 | 3 hours 53 minutes | Carrier |
Delay causes
Why OO 5221 runs late
Carrier accounts for 90% of the 4,205 delay minutes carriers reported here, and the remaining four split what is left.
- 90%Carrier
- 10%National Airspace System
- 0%Extreme weather
The largest share of delay minutes, 90%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,801 of the 4,205 delay minutes reported here. The split is drawn from 4,205 delay minutes reported on OO 5221.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
5.3% 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 close to two 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: 90.0% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Denver International (DEN) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.