Flight number record
OO 4119
SkyWest Airlines · Los Angeles to Phoenix
- Route
- LAX → PHX
- Departs
- 07:20
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4119, 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 4119 earns a B. 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 45 minutes. That rests on 362 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 4119's record is 8 points better than the US average of 77.3%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.
Key figures
On time
84.8%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 10 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.
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Schedule
When OO 4119 flies
OO 4119 flies LAX to PHX without a single fixed slot. Its most common scheduled departure was 07:20, used on 79 of 362 flights, with 07:30 (50 flights) next.
- Departs 07:2079 flights21.8%
- Departs 07:3050 flights13.8%
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 07:20 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4119 runs 5 points worse at 84.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 4119 next to LAX to PHX
Every carrier on LAX to PHX combined arrived on time 80.3% of the time across 7,623 flights, so OO 4119 is 5 points ahead of it. SkyWest flew 2,677 flights on the same city pair under all its flight numbers, including this one, and those ran 87.2% on time. 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 4119thin sample | 362 | 84.8% | 45 min | 1.93% | B |
| All SkyWest Airlines on LAX–PHX | 2,677 | 87.2% | 61 min | 0.71% | A+ |
| All carriers on LAX–PHX | 7,623 | 80.3% | 68 min | 0.77% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4119 quarter by quarter
OO 4119 did not run the same all year. Its best quarter was Jul–Sep 2026 at 100.0% on time and its weakest Jan–Mar 2026 at 67.4%, a swing of 33 points on roughly 72 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 202590 flights83.1%
- Jan–Mar 202689 flights67.4%
- Apr–Jun 202691 flights92.3%
- Jul–Sep 202662 flights100.0%
Scale runs 60% to 100%.
By weekday, OO 4119 did best on Wednesday at 92.2% on time and worst on Thursday at 78.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4119 runs when it is late
OO 4119 often beats the schedule: 115 of 355 completed flights, 32%, arrived 15 minutes or more early. The 54 late arrivals split 18 under half an hour, 21 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early115 flights32.4%
- Within 15 min186 flights52.4%
- 15–29 min late18 flights5.1%
- 30–59 min late21 flights5.9%
- 1–2 hours late14 flights3.9%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
11 of 41 late departures made up the time and arrived on time, 27% of them. In the other direction, 24 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 PHX.
The worst days
Worst days for OO 4119
The latest arrival of the period was on 12 October 2025, 2 hours 15 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 October 2025 | 2 hours 15 minutes | National Airspace System |
| 19 April 2026 | 1 hour 51 minutes | Carrier |
| 21 October 2025 | 1 hour 47 minutes | Extreme weather |
| 20 March 2026 | 1 hour 34 minutes | Carrier |
| 18 March 2026 | 1 hour 33 minutes | Carrier |
Delay causes
Why OO 4119 runs late
Carrier accounts for 75% of the 2,442 delay minutes carriers reported here, and the remaining four split what is left.
- 75%Carrier
- 18%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 75%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,821 of the 2,442 delay minutes reported here. The split is drawn from 2,442 delay minutes reported on OO 4119.
Cancellations sit at 1.93% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
OO 4119 is not only a LAX to PHX flight. It also flew PHX to LAX (359 flights, 90.1% 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. 362 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 |
|---|---|---|---|---|---|
| PHX to LAXthin sample | 359 | 90.1% | 49 min | 1.95% | A |
What to do with this
Booking OO 4119
For a booking, read OO 4119 as 84.8% on time with 1.93% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to PHX, every carrier and departure
- PHX to LAX, the return direction
- SkyWest Airlines 3894 on the same route88.2%
- SkyWest Airlines 3951 on the same route86.8%
- Los Angeles International (LAX) delay statistics
- Phoenix Sky Harbor International (PHX) 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
- The best time of day to fly, according to 7.05 million flight records
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.