Flight profile · SkyWest Airlines
OO4057
Phoenix (PHX) to Los Angeles (LAX) · scheduled 6:20 AM – 8:10 AM
How OO4057 performs
838 operations, September 2023 – July 2026.
OO4057 arrived on time 94.9% of the time, against 83.0% for all PHX → LAX flights, so this departure is 11.9 percentage points better than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 5.1 points better.
Source: US DOT Bureau of Transportation Statistics · 838 operations, September 2023 – July 2026 · If OO4057 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How OO4057 compares to other flight numbers, not just to itself.
This flight stays close to typical even on its worst days, a smaller gap than 98% of 11,788 comparable flight numbers.
A typical arrival is 10 min early, and the worst tenth are only 16 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where OO4057 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO4057 | 94.9% | 0.00% | -10 min | 1.3% | 838 |
| SkyWest Airlines on PHX → LAX | 89.8% | 0.34% | -9 min | 3.1% | 6,797 |
| All PHX → LAX flights | 83.0% | 0.40% | -6 min | 4.8% | 22,501 |
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
Why OO4057 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO4057 on PHX → LAX. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies OO4057 comes in late, and what that does to the departure.
OO4057 is usually the aircraft’s first flight of the day: the schedule gives it a median of 8.5 hours on the ground at PHX, so its “inbound” is mostly the aircraft’s arrival the evening before.
The aircraft flying OO4057 came in 15 or more minutes late on 14% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into PHX just before it, using the tail number in the DOT file, 812 of 838 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| OO4057 | 14% |
| Network, same turn | 29% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often OO4057’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
From pushback to gate
When it leaves PHX late, does that still matter by the time it reaches LAX?
OO4057 pushes back an average of 1.8 minutes early and reaches the gate at LAX an average of 5.8 minutes early. The 4.1 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 17.4 minutes on the taxiways at PHX, 2.7 minutes longer than a typical PHX departure in the same hour.
On arrival at LAX, OO4057 spends 11.2 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at LAX spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached LAX. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 25,597 departures from PHX scheduled in the clock hour OO4057 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at LAX (595,170 flights), not just OO4057’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
The hour it leaves PHX
Part of any flight’s record belongs to the clock rather than to the flight. OO4057 has one departure time, so this is what that time is worth.
On-time arrival rate. 25,597 departures from PHX are scheduled in the 6 AM–7 AM hour over the period, against 598,518 across the whole day.
OO4057 is scheduled out of PHX at 6:20 AM, in the 6 AM–7 AM bank. Departures from PHX in that hour arrive on time 94.0% of the time against 80.3% across the airport’s whole day — the slot alone is worth 13.7 points better before anything about this particular flight is considered.
The two airport figures cover every departure from PHX to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does OO4057 run worse on particular days?
Tuesday is historically the most reliable day and Sunday the least, a gap of 8.3 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes OO4057 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| GRR→MSP Grand Rapids to Minneapolis | March 8, 2026 – April 12, 2026 | 36 | — |
| MSP→GRR Minneapolis to Grand Rapids | March 8, 2026 – April 12, 2026 | 36 | — |
| CID→MSP Cedar Rapids to Minneapolis | January 19, 2026 – February 11, 2026 | 24 | — |
| BUF→DTW Buffalo to Detroit | January 10–17, 2026 | 2 | — |
| RST→MSP Rochester to Minneapolis | November 5, 2023 – December 15, 2023 | 41 | — |
| MKE→JFK Milwaukee to New York | October 28, 2023 – November 4, 2023 | 8 | — |
| DTW→MBS Detroit to Freeland | July 10, 2023 – September 1, 2023 | 50 | — |
| MBS→DTW Freeland to Detroit | July 10, 2023 – September 1, 2023 | 50 | — |
| PIT→MSP Pittsburgh to Minneapolis | July 9, 2023 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4057 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
6 min late
against a median of 10 min early
Percentiles over 838 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO4057 this flight | SkyWest Airlines | 94.9% | 10 min early | 838 |
| OO4119 | SkyWest Airlines | 91.0% | 9 min early | 761 |
| OO3951 | SkyWest Airlines | 87.3% | 7 min early | 671 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO4057 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 838 records of OO4057 operating PHX → LAX, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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