Flight number record
OO 4634
SkyWest Airlines · Fargo to Denver
- Route
- FAR → DEN
- Departs
- 17:10
- Flights
- 356
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4634, 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 4634 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 356 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so OO 4634 runs 12 points behind the country as a whole. Across a thousand flights that is about 117 extra late arrivals.
Key figures
On time
65.9%
Arrivals under 15 minutes late, of 346 completed flights
Avg delay
104 min
Across delayed arrivals only, not all flights
Cancelled
1.97%
National rate is 1.81%
1 hour+ late
17.6%
National rate is 8.1%
These figures cover 356 flights between July 2025 and June 2026. Beyond the headline rate, 17.6% 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 4634 flies
OO 4634 flies FAR to DEN without a single fixed slot. Its most common scheduled departure was 17:10, used on 70 of 356 flights, with 17:02 (56 flights) and 17:08 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:1070 flights19.7%
- Departs 17:0256 flights15.7%
- Departs 17:0852 flights14.6%
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 17:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 4634 runs 2 points worse at 65.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
OO 4634 next to FAR to DEN
Every carrier on FAR to DEN combined arrived on time 70.9% of the time across 1,425 flights, so OO 4634 is 5 points behind it. SkyWest flew 879 flights on the same city pair under all its flight numbers, including this one, and those ran 70.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4634thin sample | 356 | 65.9% | 104 min | 1.97% | C |
| All SkyWest Airlines on FAR–DEN | 879 | 70.1% | 101 min | 1.48% | C |
| All carriers on FAR–DEN | 1,425 | 70.9% | 91 min | 1.05% | C |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 4634 quarter by quarter
OO 4634 did not run the same all year. Its best quarter was Apr–Jun 2026 at 71.9% on time and its weakest Jul–Sep 2025 at 53.5%, a swing of 18 points on roughly 89 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 202588 flights53.5%
- Oct–Dec 202587 flights70.9%
- Jan–Mar 202690 flights67.1%
- Apr–Jun 202691 flights71.9%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4634 did best on Sunday at 75.0% on time and worst on Thursday at 57.1%. Each day rests on about 51 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 4634 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 12,000 reported delay minutes.
- 36%National Airspace System
- 29%Carrier
- 29%Late-arriving aircraft
- 5%Extreme weather
36% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,416 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 12,240 delay minutes reported on OO 4634.
Cancellations sit at 1.97% against a national 1.81%, which is ordinary. Diversions add another 0.84%.
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. 17.6% 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 627 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.
The same number turns up on two other city pairs in the data, including DEN to MYR (4) and DEN to COU (1), but none flew often enough under OO 4634 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to FAR to DEN only.
One caution: this is a thin sample. 356 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 4634
For a booking, OO 4634 is a flight to put a long connection behind. 17.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- FAR to DEN, every carrier and departure
- DEN to FAR, the return direction
- SkyWest Airlines 5462 on the same route66.1%
- Denver International (DEN) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.