Flight number record
OO 5027
SkyWest Airlines · Decatur to Chicago
- Route
- DEC → ORD
- Departs
- 09:37
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5027, 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 5027 lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 265 flights, with a median arrival 6 minutes early.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 258 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
2.26%
National rate is 1.89%
1 hour+ late
10.1%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5027 flies
OO 5027 flies DEC to ORD without a single fixed slot. Its most common scheduled departure was 09:37, used on 59 of 265 flights, with 09:44 (45 flights) and 09:49 (36 flights) next.
- Departs 09:3759 flights22.3%
- Departs 09:4445 flights17.0%
- Departs 09:4936 flights13.6%
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 09:37 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5027 runs 5 points worse at 79.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5027 next to DEC to ORD
Every carrier on DEC to ORD combined arrived on time 66.9% of the time across 627 flights, so OO 5027 is 12 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5027thin sample | 265 | 79.1% | 96 min | 2.26% | B |
| All SkyWest Airlines on DEC–ORD | 627 | 66.9% | 101 min | 5.42% | C− |
| All carriers on DEC–ORD | 627 | 66.9% | 101 min | 5.42% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5027 quarter by quarter
Quarter by quarter OO 5027 held fairly steady: 80.0% in Jul–Sep 2025, 78.7% in Oct–Dec 2025, 78.3% in Jan–Mar 2026, 79.6% in Apr–Jun 2026 and 79.5% in Jul–Sep 2026. A spread of 2 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights80.0%
- Oct–Dec 202577 flights78.7%
- Jan–Mar 202663 flights78.3%
- Apr–Jun 202650 flights79.6%
- Jul–Sep 202645 flights79.5%
Scale runs 70% to 85%.
By weekday, OO 5027 did best on Monday at 91.8% on time and worst on Sunday at 75.6%. 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 5027 runs when it is late
OO 5027 often beats the schedule: 82 of 258 completed flights, 32%, arrived 15 minutes or more early. The 54 late arrivals split 18 under half an hour, 10 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early82 flights31.8%
- Within 15 min122 flights47.3%
- 15–29 min late18 flights7.0%
- 30–59 min late10 flights3.9%
- 1–2 hours late14 flights5.4%
- 2+ hours late12 flights4.7%
Scale runs 0% to 100%.
Share of 258 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 38 departures that left 15 minutes late or more, only 4 made it up before arrival. In the other direction, 20 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 5027
The latest arrival of the period was on 29 December 2025, 9 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 December 2025 | 9 hours 30 minutes | Carrier |
| 26 November 2025 | 7 hours 7 minutes | Late-arriving aircraft |
| 14 August 2026 | 6 hours 49 minutes | Late-arriving aircraft |
| 21 October 2025 | 5 hours 7 minutes | Carrier |
| 30 November 2025 | 4 hours 2 minutes | Late-arriving aircraft |
Delay causes
Why OO 5027 runs late
Late-arriving aircraft accounts for 44% of the 5,162 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 37%Carrier
- 15%National Airspace System
- 5%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,162 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 5,162 delay minutes reported on OO 5027.
Cancellations sit at 2.26% against a national 1.89%, which is ordinary. Diversions add another 0.38%.
Connections and routes
What a delay on this flight costs
10.1% 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 same number turns up on five other city pairs in the data, including ORD to DEC (79), ORD to LAF (48) and ORD to PLN (35), but none flew often enough under OO 5027 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEC to ORD 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 5027
For a booking, read OO 5027 as 79.1% on time with 2.26% cancelled over 265 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Chicago O'Hare International (ORD) 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
- Why the first flight of the morning is statistically safest
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.