Flight number record

OO 4011

SkyWest Airlines · Atlanta to Aspen

Route: ATL → ASE
Departs: 09:40
Flights: 336
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4011, 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 4011 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 336 flights, with a median arrival 2 minutes early.

On time

75.6%

Arrivals under 15 minutes late, of 312 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

1.49%

National rate is 1.81%

1 hour+ late

9.0%

National rate is 8.1%

These figures cover 336 flights between July 2025 and June 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 4011 flies

OO 4011 flies ATL to ASE without a single fixed slot. Its most common scheduled departure was 09:40, used on 165 of 336 flights, with 09:45 (74 flights) and 09:51 (71 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:40165 flights49.1%
Departs 09:4574 flights22.0%
Departs 09:5171 flights21.1%

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 09:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 4011 runs 9 points worse at 75.6%. 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 4011 next to ATL to ASE

Every carrier on ATL to ASE combined arrived on time 72.7% of the time across 450 flights, so OO 4011 is 3 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 3 points.

OO 4011 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4011thin sample	336	75.6%	75 min	1.49%	B
All SkyWest Airlines on ATL–ASE	450	72.7%	81 min	1.56%	C
All carriers on ATL–ASE	450	72.7%	81 min	1.56%	C
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4011 quarter by quarter

OO 4011 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.5% on time and its weakest Jan–Mar 2026 at 68.3%, a swing of 14 points on roughly 84 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 flights80.5%
Oct–Dec 202592 flights73.3%
Jan–Mar 202690 flights68.3%
Apr–Jun 202662 flights82.5%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4011 did best on Wednesday at 82.6% on time and worst on Saturday at 70.5%. Each day rests on about 48 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4011 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 5,660 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
57%
Extreme weather
26%
National Airspace System
16%
Security
0%

Extreme weather accounts for 26% 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 4.2 times the usual weather exposure. The split is drawn from 5,660 delay minutes reported on OO 4011.

Cancellations sit at 1.49% against a national 1.81%, which is ordinary. Diversions add another 5.65%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 1,304 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 336 flights under OO 4011 in the data flew ATL to ASE. 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. 336 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 4011

For a booking, read OO 4011 as 75.6% on time with 1.49% cancelled over 336 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