Flight number record
OO 4670
SkyWest Airlines · Duluth to Chicago
- Route
- DLH → ORD
- Departs
- 08:00
- Flights
- 313
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4670, 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 4670 lands a B−, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 313 flights, with a median arrival 3 minutes early.
Key figures
On time
77.1%
Arrivals under 15 minutes late, of 301 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
3.51%
National rate is 1.89%
1 hour+ late
10.0%
National rate is 8.3%
These figures cover 313 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When OO 4670 flies
OO 4670 flies DLH to ORD without a single fixed slot. Its most common scheduled departure was 08:00, used on 55 of 313 flights, with 07:03 (55 flights) and 07:55 (53 flights) next.
- Departs 08:0055 flights17.6%
- Departs 07:0355 flights17.6%
- Departs 07:5553 flights16.9%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4670 runs 7 points worse at 77.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
OO 4670 next to DLH to ORD
Every carrier on DLH to ORD combined arrived on time 69.0% of the time across 1,239 flights, so OO 4670 is 8 points ahead of it. SkyWest flew 1,116 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4670thin sample | 313 | 77.1% | 103 min | 3.51% | B− |
| All SkyWest Airlines on DLH–ORD | 1,116 | 68.3% | 108 min | 4.84% | C− |
| All carriers on DLH–ORD | 1,239 | 69.0% | 106 min | 4.76% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4670 quarter by quarter
OO 4670 did not run the same all year. Its best quarter was Jul–Sep 2026 at 85.0% on time and its weakest Jan–Mar 2026 at 69.9%, 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 202530 flights—
- Oct–Dec 202592 flights77.3%
- Jan–Mar 202687 flights69.9%
- Apr–Jun 202661 flights75.4%
- Jul–Sep 202643 flights85.0%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4670 did best on Saturday at 82.9% on time and worst on Friday at 69.8%. Each day rests on about 45 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4670 runs when it is late
The 69 late arrivals split 21 under half an hour, 18 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early58 flights19.3%
- Within 15 min174 flights57.8%
- 15–29 min late21 flights7.0%
- 30–59 min late18 flights6.0%
- 1–2 hours late13 flights4.3%
- 2+ hours late17 flights5.6%
Scale runs 0% to 100%.
Share of 301 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 46 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 26 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 4670
The latest arrival of the period was on 7 December 2025, 9 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 9 hours 30 minutes | Carrier |
| 18 February 2026 | 9 hours 16 minutes | Extreme weather |
| 18 May 2026 | 8 hours 29 minutes | Carrier |
| 29 December 2025 | 7 hours 58 minutes | Carrier |
| 6 March 2026 | 6 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why OO 4670 runs late
Carrier accounts for 63% of the 7,128 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 15%Extreme weather
- 12%Late-arriving aircraft
- 11%National Airspace System
Extreme weather accounts for 15% 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 2.4 times the usual weather exposure. The split is drawn from 7,128 delay minutes reported on OO 4670.
Cancellations run at 3.51%, against 1.89% nationally. That is about one flight in 30 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
10.0% 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 three other city pairs in the data, including ORD to SDF (34), ATW to ORD (32) and FSD to ORD (1), but none flew often enough under OO 4670 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DLH to ORD only.
One caution: this is a thin sample. 313 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 4670
For a booking, the cancellation rate is the figure to plan around on OO 4670: 3.51% of its 313 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DLH to ORD, every carrier and departure
- ORD to DLH, the return direction
- SkyWest Airlines 4685 on the same route58.9%
- SkyWest Airlines 5754 on the same route66.9%
- 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
- How often a connection fails at the major US hubs
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.