Flight number record
OO 4821
SkyWest Airlines · Dallas-Fort Worth to Grand Island
- Route
- DFW → GRI
- Departs
- 15:32
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4821, 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 4821 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 344 flights, with a median arrival 9 minutes early.
Key figures
On time
74.2%
Arrivals under 15 minutes late, of 337 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
1.45%
National rate is 1.89%
1 hour+ late
13.1%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. Beyond the headline rate, 13.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4821 flies
OO 4821 flies DFW to GRI without a single fixed slot. Its most common scheduled departure was 15:32, used on 81 of 344 flights, with 15:50 (65 flights) and 15:30 (41 flights) next.
- Departs 15:3281 flights23.5%
- Departs 15:5065 flights18.9%
- Departs 15:3041 flights11.9%
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 15:32 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4821 runs 2 points better at 74.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 4821 next to DFW to GRI
Every carrier on DFW to GRI combined arrived on time 75.6% of the time across 703 flights, so OO 4821 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4821thin sample | 344 | 74.2% | 83 min | 1.45% | C |
| All SkyWest Airlines on DFW–GRI | 703 | 75.6% | 105 min | 2.42% | B |
| All carriers on DFW–GRI | 703 | 75.6% | 105 min | 2.42% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4821 quarter by quarter
OO 4821 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Apr–Jun 2026 at 68.0%, a swing of 19 points on roughly 69 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 flights86.7%
- Oct–Dec 202592 flights77.8%
- Jan–Mar 202690 flights70.5%
- Apr–Jun 202678 flights68.0%
- Jul–Sep 202654 flights75.9%
Scale runs 60% to 90%.
By weekday, OO 4821 did best on Tuesday at 86.7% on time and worst on Saturday at 59.2%. Each day rests on about 49 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4821 runs when it is late
OO 4821 often beats the schedule: 120 of 337 completed flights, 36%, arrived 15 minutes or more early. When OO 4821 is late it tends to be very late: 44 of its 87 late arrivals were an hour or more behind, and 21 were two hours or more.
- 15+ min early120 flights35.6%
- Within 15 min130 flights38.6%
- 15–29 min late17 flights5.0%
- 30–59 min late26 flights7.7%
- 1–2 hours late23 flights6.8%
- 2+ hours late21 flights6.2%
Scale runs 0% to 100%.
Share of 337 completed flights by arrival against schedule.
17 of 98 late departures made up the time and arrived on time, 17% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for OO 4821
The latest arrival of the period was on 27 January 2026, 3 hours 56 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 January 2026 | 3 hours 56 minutes | Extreme weather |
| 18 March 2026 | 3 hours 48 minutes | Carrier |
| 26 January 2026 | 3 hours 41 minutes | Extreme weather |
| 3 January 2026 | 3 hours 36 minutes | Carrier |
| 16 March 2026 | 3 hours 34 minutes | Late-arriving aircraft |
Delay causes
Why OO 4821 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 7,189 reported delay minutes.
- 38%Late-arriving aircraft
- 35%Carrier
- 17%Extreme weather
- 11%National Airspace System
Extreme weather accounts for 17% 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 2.8 times the usual weather exposure. The split is drawn from 7,189 delay minutes reported on OO 4821.
Cancellations sit at 1.45% against a national 1.89%, which is ordinary. Diversions add another 0.58%.
Connections and routes
What a delay on this flight costs
13.1% 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 562 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.
OO 4821 is not only a DFW to GRI flight. It also flew GRI to DFW (338 flights, 73.0% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 344 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| GRI to DFWthin sample | 338 | 73.0% | 118 min | 3.25% | C− |
What to do with this
Booking OO 4821
For a booking, OO 4821 is a flight to put a long connection behind. 13.1% 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
- Dallas/Fort Worth International (DFW) 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.