Flight number record
OO 4778
SkyWest Airlines · Chicago to Fargo
- Route
- ORD → FAR
- Departs
- 08:45
- Flights
- 259
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4778, 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 4778 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 259 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4778 runs 14 points behind the country as a whole. Across a thousand flights that is about 136 extra late arrivals.
Key figures
On time
63.7%
Arrivals under 15 minutes late, of 251 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.32%
National rate is 1.89%
1 hour+ late
10.8%
National rate is 8.3%
These figures cover 259 flights between September 2025 and August 2026. Beyond the headline rate, 10.8% 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 4778 flies
OO 4778 is scheduled to leave Chicago (ORD) at 08:45 local time and reach Fargo (FAR) at 10:56. That slot held for 240 of the 259 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 08:45240 flights92.7%
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 08:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4778 runs 20 points worse at 63.7%. 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 4778 next to ORD to FAR
Every carrier on ORD to FAR combined arrived on time 69.5% of the time across 2,001 flights, so OO 4778 is 6 points behind it. SkyWest flew 923 flights on the same city pair under all its flight numbers, including this one, and those ran 61.7% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4778thin sample | 259 | 63.7% | 62 min | 2.32% | D |
| All SkyWest Airlines on ORD–FAR | 923 | 61.7% | 79 min | 3.36% | D− |
| All carriers on ORD–FAR | 2,001 | 69.5% | 73 min | 3.20% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4778 quarter by quarter
OO 4778 did not run the same all year. Its best quarter was Apr–Jun 2026 at 70.2% on time and its weakest Oct–Dec 2025 at 58.9%, a swing of 11 points on roughly 86 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 flights58.9%
- Jan–Mar 202688 flights63.5%
- Apr–Jun 202649 flights70.2%
Scale runs 50% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4778 did best on Thursday at 74.3% on time and worst on Friday at 56.8%. Each day rests on about 37 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4778 runs when it is late
The 91 late arrivals split 32 under half an hour, 32 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early52 flights20.7%
- Within 15 min108 flights43.0%
- 15–29 min late32 flights12.7%
- 30–59 min late32 flights12.7%
- 1–2 hours late16 flights6.4%
- 2+ hours late11 flights4.4%
Scale runs 0% to 100%.
Share of 251 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 67 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 31 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 FAR.
The worst days
Worst days for OO 4778
The latest arrival of the period was on 7 December 2025, 7 hours 26 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across December, March, January and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 7 hours 26 minutes | National Airspace System |
| 30 March 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 12 December 2025 | 3 hours 28 minutes | Late-arriving aircraft |
| 17 January 2026 | 3 hours 7 minutes | Carrier |
| 28 October 2025 | 3 hours 3 minutes | Carrier |
Delay causes
Why OO 4778 runs late
Carrier accounts for 50% of the 5,661 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 24%National Airspace System
- 23%Late-arriving aircraft
- 3%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,837 of the 5,661 delay minutes reported here. The split is drawn from 5,661 delay minutes reported on OO 4778.
Cancellations sit at 2.32% against a national 1.89%, which is ordinary. Diversions add another 0.77%.
Connections and routes
What a delay on this flight costs
10.8% 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 557 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 FAR to ORD (81), ORD to MSN (10) and DEN to STL (9), but none flew often enough under OO 4778 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to FAR only.
One caution: this is a thin sample. 259 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 4778
For a booking, OO 4778 is one of the weaker ways to fly ORD to FAR: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ORD to FAR, every carrier and departure
- FAR to ORD, the return direction
- Envoy Air 3377 on the same route67.0%
- 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.