Flight number record
OO 5019
SkyWest Airlines · Watertown to Denver
- Route
- ATY → DEN
- Departs
- 18:27
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5019, 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 5019 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 265 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5019 runs 5 points behind the country as a whole. Across a thousand flights that is about 50 extra late arrivals.
Key figures
On time
72.3%
Arrivals under 15 minutes late, of 260 completed flights
Avg delay
110 min
Across delayed arrivals only, not all flights
Cancelled
1.13%
National rate is 1.89%
1 hour+ late
11.5%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5019 flies
OO 5019 flies ATY to DEN without a single fixed slot. Its most common scheduled departure was 18:27, used on 73 of 265 flights, with 18:26 (31 flights) and 18:25 (31 flights) next.
- Departs 18:2773 flights27.5%
- Departs 18:2631 flights11.7%
- Departs 18:2531 flights11.7%
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 18:27 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 5019 runs 4 points better at 72.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 5019 next to ATY to DEN
Every carrier on ATY to DEN combined arrived on time 75.1% of the time across 363 flights, so OO 5019 is 3 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5019thin sample | 265 | 72.3% | 110 min | 1.13% | C |
| All SkyWest Airlines on ATY–DENthin sample | 363 | 75.1% | 118 min | 0.83% | B+ |
| All carriers on ATY–DENthin sample | 363 | 75.1% | 118 min | 0.83% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5019 quarter by quarter
OO 5019 did not run the same all year. Its best quarter was Apr–Jun 2026 at 79.1% on time and its weakest Jul–Sep 2026 at 56.9%, a swing of 22 points on roughly 53 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 flights66.7%
- Oct–Dec 202554 flights77.8%
- Jan–Mar 202652 flights78.4%
- Apr–Jun 202667 flights79.1%
- Jul–Sep 202662 flights56.9%
Scale runs 50% to 85%.
By weekday, OO 5019 did best on Tuesday at 81.1% on time and worst on Wednesday at 64.9%. Each day rests on about 38 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5019 runs when it is late
OO 5019 often beats the schedule: 69 of 260 completed flights, 27%, arrived 15 minutes or more early. The 72 late arrivals split 20 under half an hour, 22 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early69 flights26.5%
- Within 15 min119 flights45.8%
- 15–29 min late20 flights7.7%
- 30–59 min late22 flights8.5%
- 1–2 hours late17 flights6.5%
- 2+ hours late13 flights5.0%
Scale runs 0% to 100%.
Share of 260 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 49 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 28 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for OO 5019
The latest arrival of the period was on 15 July 2026, 23 hours 51 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 July 2026 | 23 hours 51 minutes | Carrier |
| 4 October 2025 | 16 hours 44 minutes | Carrier |
| 15 December 2025 | 13 hours 42 minutes | Carrier |
| 2 October 2025 | 3 hours 38 minutes | Carrier |
| 10 July 2026 | 3 hours 22 minutes | Late-arriving aircraft |
Delay causes
Why OO 5019 runs late
Carrier accounts for 59% of the 7,909 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 25%National Airspace System
- 13%Late-arriving aircraft
- 4%Extreme weather
- 0%Security
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,636 of the 7,909 delay minutes reported here. The split is drawn from 7,909 delay minutes reported on OO 5019.
Cancellations sit at 1.13% against a national 1.89%, which is ordinary. Diversions add another 0.75%.
Connections and routes
What a delay on this flight costs
11.5% 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 519 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.
The same number turns up on five other city pairs in the data, including DEN to ATY (73), LAR to DEN (25) and CHA to IAH (24), but none flew often enough under OO 5019 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATY to DEN only.
One caution: this is a thin sample. 265 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 5019
For a booking, read OO 5019 as 72.3% on time with 1.13% cancelled over 265 flights. Those are rates from the past twelve months, not a forecast for any particular 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
- How often a connection fails at the major US hubs
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.