Flight number record
OO 4177
SkyWest Airlines · Austin to McAllen
- Route
- AUS → MFE
- Departs
- 10:30
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4177, 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 4177 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 364 flights, with a median arrival 9 minutes early.
Set against the rest of the country, OO 4177's record is 8 points better than the US average of 77.3%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.
Key figures
On time
85.1%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
7.2%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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 4177 flies
OO 4177 flies AUS to MFE without a single fixed slot. Its most common scheduled departure was 10:30, used on 99 of 364 flights, with 10:35 (72 flights) and 11:00 (38 flights) next.
- Departs 10:3099 flights27.2%
- Departs 10:3572 flights19.8%
- Departs 11:0038 flights10.4%
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 10:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4177 runs level with that at 85.1%. 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 4177 next to AUS to MFE
Every carrier on AUS to MFE combined arrived on time 83.8% of the time across 1,032 flights, so OO 4177 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4177thin sample | 364 | 85.1% | 67 min | 0.27% | A+ |
| All SkyWest Airlines on AUS–MFE | 1,032 | 83.8% | 89 min | 0.39% | B+ |
| All carriers on AUS–MFE | 1,032 | 83.8% | 89 min | 0.39% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4177 quarter by quarter
OO 4177 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Apr–Jun 2026 at 80.2%, a swing of 13 points on roughly 73 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 flights93.3%
- Oct–Dec 202591 flights86.8%
- Jan–Mar 202690 flights86.5%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202662 flights83.9%
Scale runs 70% to 100%.
By weekday, OO 4177 ranged from 80.4% on Saturday to 90.4% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4177 runs when it is late
OO 4177 often beats the schedule: 116 of 363 completed flights, 32%, arrived 15 minutes or more early. The 54 late arrivals split 16 under half an hour, 12 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early116 flights32.0%
- Within 15 min193 flights53.2%
- 15–29 min late16 flights4.4%
- 30–59 min late12 flights3.3%
- 1–2 hours late19 flights5.2%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
10 of 60 late departures made up the time and arrived on time, 17% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for OO 4177
The latest arrival of the period was on 7 March 2026, 4 hours 56 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 4 hours 56 minutes | Carrier |
| 8 April 2026 | 2 hours 49 minutes | Carrier |
| 1 February 2026 | 2 hours 35 minutes | Extreme weather |
| 22 August 2026 | 2 hours 13 minutes | Carrier |
| 2 August 2026 | 2 hours 10 minutes | Carrier |
Delay causes
Why OO 4177 runs late
Carrier accounts for 70% of the 3,634 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 23%Extreme weather
- 7%National Airspace System
Extreme weather accounts for 23% 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 3.8 times the usual weather exposure. The split is drawn from 3,634 delay minutes reported on OO 4177.
Cancellations are rare at 0.27%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
OO 4177 is not only a AUS to MFE flight. It also flew MFE to AUS (286 flights, 83.1% 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. 364 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 |
|---|---|---|---|---|---|
| MFE to AUSthin sample | 286 | 83.1% | 73 min | 0.70% | B+ |
What to do with this
Booking OO 4177
For a booking, OO 4177 has one of the better records a US domestic flight can show: 85.1% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- AUS to MFE, every carrier and departure
- MFE to AUS, the return direction
- SkyWest Airlines 4067 on the same route84.1%
- Austin-Bergstrom International (AUS) 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
- Worst months to fly in the US, ranked by the data
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.