Flight number record

OO 5638

SkyWest Airlines · Durango to Denver

Route: DRO → DEN
Departs: 11:36
Flights: 312
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 lands a B, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 312 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 5638's record is 6 points better than the US average of 77.6%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.

On time

83.4%

Arrivals under 15 minutes late, of 307 completed flights

Avg delay

103 min

Across delayed arrivals only, not all flights

Cancelled

1.60%

National rate is 1.81%

1 hour+ late

7.2%

National rate is 8.1%

These figures cover 312 flights between July 2025 and June 2026. The median arrival is 13 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 5638 flies

OO 5638 flies DRO to DEN without a single fixed slot. Its most common scheduled departure was 11:36, used on 74 of 312 flights, with 11:00 (65 flights) and 11:33 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:3674 flights23.7%
Departs 11:0065 flights20.8%
Departs 11:3345 flights14.4%

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 11:36 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5638 runs 5 points better at 83.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5638 next to DRO to DEN

Every carrier on DRO to DEN combined arrived on time 81.2% of the time across 2,192 flights, so OO 5638 is 2 points ahead of it. SkyWest flew 1,461 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 4 points.

OO 5638 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5638thin sample	312	83.4%	103 min	1.60%	B
All SkyWest Airlines on DRO–DEN	1,461	80.1%	94 min	1.57%	B
All carriers on DRO–DEN	2,192	81.2%	87 min	1.23%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5638 quarter by quarter

OO 5638 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.0% on time and its weakest Jan–Mar 2026 at 76.6%, a swing of 15 points on roughly 78 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 flights80.4%
Oct–Dec 202592 flights87.5%
Jan–Mar 202678 flights76.6%
Apr–Jun 202650 flights92.0%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5638 ranged from 78.0% on Tuesday to 88.4% on Friday. With about 45 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 5638 runs late

One category carries most of the weight here. Carrier accounts for 44% of the 5,236 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
44%
Late-arriving aircraft
27%
National Airspace System
19%
Extreme weather
10%

The largest share of delay minutes, 44%, 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 2,279 of the 5,236 delay minutes reported here. The split is drawn from 5,236 delay minutes reported on OO 5638.

Cancellations sit at 1.60% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

7.2% of arrivals land an hour or more late, close to the national 8.1%. 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 close to two hours, which a normal layover absorbs.

The same number turns up on two other city pairs in the data, including ORD to CLE (5) 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. 312 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 83.4% on time with 1.60% cancelled over 312 flights. Those are rates from the past twelve months, not a forecast for any particular 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