Flight number record
OO 5638
SkyWest Airlines · Durango to Denver
- Route
- DRO → DEN
- Departs
- 11:00
- Flights
- 250
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5638, 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 5638 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 8 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 250 flights, with a median arrival 16 minutes early.
Set against the rest of the country, OO 5638's record is 8 points better than the US average of 77.3%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.
Key figures
On time
85.7%
Arrivals under 15 minutes late, of 245 completed flights
Avg delay
117 min
Across delayed arrivals only, not all flights
Cancelled
2.00%
National rate is 1.89%
1 hour+ late
6.5%
National rate is 8.3%
These figures cover 250 flights between September 2025 and August 2026. The median arrival is 16 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 5638 flies
OO 5638 flies DRO to DEN without a single fixed slot. Its most common scheduled departure was 11:00, used on 56 of 250 flights, with 11:33 (45 flights) and 11:36 (32 flights) next.
- Departs 11:0056 flights22.4%
- Departs 11:3345 flights18.0%
- Departs 11:3632 flights12.8%
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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5638 runs 7 points better at 85.7%. 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 5638 next to DRO to DEN
Every carrier on DRO to DEN combined arrived on time 82.5% of the time across 2,201 flights, so OO 5638 is 3 points ahead of it. SkyWest flew 1,471 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5638thin sample | 250 | 85.7% | 117 min | 2.00% | A |
| All SkyWest Airlines on DRO–DEN | 1,471 | 80.9% | 95 min | 1.43% | B |
| All carriers on DRO–DEN | 2,201 | 82.5% | 89 min | 1.09% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5638 quarter by quarter
OO 5638 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 76.6%, a swing of 17 points on roughly 63 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 flights93.3%
- Oct–Dec 202592 flights87.5%
- Jan–Mar 202678 flights76.6%
- Apr–Jun 202650 flights92.0%
Scale runs 70% to 100%.
By weekday, OO 5638 did best on Saturday at 91.9% on time and worst on Tuesday at 78.1%. Each day rests on about 36 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5638 runs when it is late
OO 5638 often beats the schedule: 128 of 245 completed flights, 52%, arrived 15 minutes or more early. The 35 late arrivals split 8 under half an hour, 11 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early128 flights52.2%
- Within 15 min82 flights33.5%
- 15–29 min late8 flights3.3%
- 30–59 min late11 flights4.5%
- 1–2 hours late6 flights2.4%
- 2+ hours late10 flights4.1%
Scale runs 0% to 100%.
Share of 245 completed flights by arrival against schedule.
8 of 32 late departures made up the time and arrived on time, 25% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for OO 5638
The latest arrival of the period was on 8 March 2026, 11 hours 54 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Four of the five worst days fell in February 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 March 2026 | 11 hours 54 minutes | Late-arriving aircraft |
| 20 February 2026 | 6 hours 32 minutes | Carrier |
| 15 February 2026 | 5 hours 31 minutes | Late-arriving aircraft |
| 18 February 2026 | 5 hours 6 minutes | Extreme weather |
| 17 February 2026 | 5 hours 3 minutes | National Airspace System |
Delay causes
Why OO 5638 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 4,093 reported delay minutes.
- 34%Carrier
- 31%Late-arriving aircraft
- 24%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 4,093 delay minutes reported on OO 5638.
Cancellations sit at 2.00% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
6.5% 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.
The same number turns up on three other city pairs in the data, including ORD to CLE (45), DEN to CPR (21) and ORD to CAK (1), but none flew often enough under OO 5638 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DRO to DEN only.
One caution: this is a thin sample. 250 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 5638
For a booking, read OO 5638 as 85.7% on time with 2.00% cancelled over 250 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DRO to DEN, every carrier and departure
- DEN to DRO, the return direction
- SkyWest Airlines 5952 on the same route72.1%
- United Airlines 687 on the same route89.6%
- SkyWest Airlines 5227 on the same route71.0%
- 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.