Flight number record
OO 4634
SkyWest Airlines · Fargo to Denver
- Route
- FAR → DEN
- Departs
- 17:11
- Flights
- 355
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 an hour and a half behind schedule. Build slack into anything you connect to. That rests on 355 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so OO 4634 runs 10 points behind the country as a whole. Across a thousand flights that is about 103 extra late arrivals.
Key figures
On time
67.0%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
97 min
Across delayed arrivals only, not all flights
Cancelled
1.97%
National rate is 1.89%
1 hour+ late
17.4%
National rate is 8.3%
These figures cover 355 flights between September 2025 and August 2026. Beyond the headline rate, 17.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4634 flies
OO 4634 flies FAR to DEN without a single fixed slot. Its most common scheduled departure was 17:11, used on 81 of 355 flights, with 17:13 (71 flights) and 17:02 (56 flights) next.
- Departs 17:1181 flights22.8%
- Departs 17:1371 flights20.0%
- Departs 17:0256 flights15.8%
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 17:11 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4634 runs level with that at 67.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4634 next to FAR to DEN
Every carrier on FAR to DEN combined arrived on time 72.6% of the time across 1,413 flights, so OO 4634 is 6 points behind it. SkyWest flew 878 flights on the same city pair under all its flight numbers, including this one, and those ran 71.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4634thin sample | 355 | 67.0% | 97 min | 1.97% | C |
| All SkyWest Airlines on FAR–DEN | 878 | 71.0% | 101 min | 1.48% | C |
| All carriers on FAR–DEN | 1,413 | 72.6% | 90 min | 0.99% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 2026 at 52.5%, a swing of 19 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 202526 flights—
- Oct–Dec 202587 flights70.9%
- Jan–Mar 202690 flights67.1%
- Apr–Jun 202691 flights71.9%
- Jul–Sep 202661 flights52.5%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4634 did best on Tuesday at 74.5% on time and worst on Thursday at 57.1%. Each day rests on about 51 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4634 runs when it is late
OO 4634 often beats the schedule: 89 of 345 completed flights, 26%, arrived 15 minutes or more early. When OO 4634 is late it tends to be very late: 60 of its 114 late arrivals were an hour or more behind, and 29 were two hours or more.
- 15+ min early89 flights25.8%
- Within 15 min142 flights41.2%
- 15–29 min late24 flights7.0%
- 30–59 min late30 flights8.7%
- 1–2 hours late31 flights9.0%
- 2+ hours late29 flights8.4%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 97 departures that left 15 minutes late or more, only 10 made it up before arrival. In the other direction, 27 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 DEN.
The worst days
Worst days for OO 4634
The latest arrival of the period was on 16 January 2026, 20 hours 56 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across January, July, December and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 January 2026 | 20 hours 56 minutes | Late-arriving aircraft |
| 22 July 2026 | 4 hours 56 minutes | National Airspace System |
| 25 December 2025 | 4 hours 43 minutes | Late-arriving aircraft |
| 3 August 2026 | 4 hours 41 minutes | National Airspace System |
| 23 January 2026 | 4 hours 39 minutes | Carrier |
Delay causes
Why OO 4634 runs late
National Airspace System accounts for 46% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%National Airspace System
- 28%Late-arriving aircraft
- 20%Carrier
- 7%Extreme weather
46% 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 5,032 minutes out of 11,000, against a national NAS share of 21%. The split is drawn from 11,044 delay minutes reported on OO 4634.
Cancellations sit at 1.97% against a national 1.89%, which is ordinary. Diversions add another 0.85%.
Connections and routes
What a delay on this flight costs
17.4% 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 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.
The same number turns up on three other city pairs in the data, including DEN to MYR (4), DEN to COU (1) and IAH to SGF (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. 355 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. 17.4% 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 route66.9%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.