Flight number record

OO 5956

SkyWest Airlines · Aspen to Chicago

Route: ASE → ORD
Departs: 12:39
Flights: 280
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5956, 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 5956 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 280 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.3%, so OO 5956 runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.

On time

68.2%

Arrivals under 15 minutes late, of 261 completed flights

Avg delay

92 min

Across delayed arrivals only, not all flights

Cancelled

4.64%

National rate is 1.89%

1 hour+ late

15.7%

National rate is 8.3%

These figures cover 280 flights between September 2025 and August 2026. Beyond the headline rate, 15.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When OO 5956 flies

OO 5956 flies ASE to ORD without a single fixed slot. Its most common scheduled departure was 12:39, used on 80 of 280 flights, with 12:25 (53 flights) and 12:40 (47 flights) next.

Departs 12:3980 flights28.6%
Departs 12:2553 flights18.9%
Departs 12:4047 flights16.8%

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 12:39 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5956 runs 10 points worse at 68.2%. 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 5956 next to ASE to ORD

Every carrier on ASE to ORD combined arrived on time 63.3% of the time across 1,179 flights, so OO 5956 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 11 points.

OO 5956 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5956thin sample	280	68.2%	92 min	4.64%	C−
All SkyWest Airlines on ASE–ORD	1,179	63.3%	102 min	5.85%	D−
All carriers on ASE–ORD	1,179	63.3%	102 min	5.85%	D−
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 5956 quarter by quarter

OO 5956 did not run the same all year. Its best quarter was Jul–Sep 2025 at 76.7% on time and its weakest Jul–Sep 2026 at 54.4%, a swing of 22 points on roughly 56 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 flights76.7%
Oct–Dec 202541 flights63.4%
Jan–Mar 202685 flights75.0%
Apr–Jun 202662 flights71.7%
Jul–Sep 202662 flights54.4%

Scale runs 45% to 80%.

By weekday, OO 5956 did best on Wednesday at 79.5% on time and worst on Saturday at 60.5%. Each day rests on about 40 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 5956 runs when it is late

OO 5956 often beats the schedule: 78 of 261 completed flights, 30%, arrived 15 minutes or more early. The 83 late arrivals split 13 under half an hour, 29 between 30 and 60 minutes, and 41 an hour or more.

15+ min early78 flights29.9%
Within 15 min100 flights38.3%
15–29 min late13 flights5.0%
30–59 min late29 flights11.1%
1–2 hours late19 flights7.3%
2+ hours late22 flights8.4%

Scale runs 0% to 100%.

Share of 261 completed flights by arrival against schedule.

9 of 74 late departures made up the time and arrived on time, 12% of them. In the other direction, 18 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 ORD.

The worst days

Worst days for OO 5956

The latest arrival of the period was on 7 June 2026, 8 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across June, December, July and September, with no single month standing out.

The latest arrivals of OO 5956 in the period
Date	Arrived late by	Largest filed cause
7 June 2026	8 hours 1 minute	Carrier
7 December 2025	7 hours 20 minutes	National Airspace System
21 July 2026	6 hours 25 minutes	Extreme weather
4 December 2025	4 hours 19 minutes	Late-arriving aircraft
11 September 2025	4 hours 5 minutes	Late-arriving aircraft

Delay causes

Why OO 5956 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 7,618 reported delay minutes.

Carrier
30%
National Airspace System
28%
Extreme weather
21%
Late-arriving aircraft
21%

Extreme weather accounts for 21% 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 3.5 times the usual weather exposure. The split is drawn from 7,618 delay minutes reported on OO 5956.

Cancellations run at 4.64%, against 1.89% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

15.7% 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 1,013 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 three other city pairs in the data, including PSP to SFO (56), ORD to MKE (39) and ORD to CID (21), but none flew often enough under OO 5956 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ASE to ORD only.

One caution: this is a thin sample. 280 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 5956

For a booking, the cancellation rate is the figure to plan around on OO 5956: 4.64% of its 280 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures