Flight number record
OO 5578
SkyWest Airlines · Pasco to San Francisco
- Route
- PSC → SFO
- Departs
- 13:35
- Flights
- 291
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5578, 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 5578 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 291 flights, with a median arrival 6 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5578 runs 10 points behind the country as a whole. Across a thousand flights that is about 97 extra late arrivals.
Key figures
On time
67.6%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
0.34%
National rate is 1.89%
1 hour+ late
13.4%
National rate is 8.3%
These figures cover 291 flights between September 2025 and August 2026. Beyond the headline rate, 13.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5578 flies
OO 5578 flies PSC to SFO without a single fixed slot. Its most common scheduled departure was 13:35, used on 101 of 291 flights, with 13:39 (53 flights) and 15:05 (45 flights) next.
- Departs 13:35101 flights34.7%
- Departs 13:3953 flights18.2%
- Departs 15:0545 flights15.5%
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 13:35 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5578 runs 11 points worse at 67.6%. 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 5578 next to PSC to SFO
Every carrier on PSC to SFO combined arrived on time 69.2% of the time across 577 flights, so OO 5578 is 2 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5578thin sample | 291 | 67.6% | 84 min | 0.34% | C+ |
| All SkyWest Airlines on PSC–SFO | 577 | 69.2% | 78 min | 0.17% | C+ |
| All carriers on PSC–SFO | 577 | 69.2% | 78 min | 0.17% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5578 quarter by quarter
OO 5578 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.1% on time and its weakest Apr–Jun 2026 at 49.5%, a swing of 37 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.
- Oct–Dec 202566 flights84.6%
- Jan–Mar 202672 flights86.1%
- Apr–Jun 202691 flights49.5%
- Jul–Sep 202662 flights54.8%
Scale runs 40% to 90%.
By weekday, OO 5578 did best on Tuesday at 81.6% on time and worst on Thursday at 58.1%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5578 runs when it is late
OO 5578 often beats the schedule: 107 of 290 completed flights, 37%, arrived 15 minutes or more early. The 94 late arrivals split 25 under half an hour, 30 between 30 and 60 minutes, and 39 an hour or more.
- 15+ min early107 flights36.9%
- Within 15 min89 flights30.7%
- 15–29 min late25 flights8.6%
- 30–59 min late30 flights10.3%
- 1–2 hours late26 flights9.0%
- 2+ hours late13 flights4.5%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 75 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 26 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 SFO.
The worst days
Worst days for OO 5578
The latest arrival of the period was on 11 April 2026, 21 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across April, June and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 April 2026 | 21 hours 2 minutes | Carrier |
| 9 June 2026 | 6 hours 25 minutes | Late-arriving aircraft |
| 17 June 2026 | 5 hours 28 minutes | Extreme weather |
| 20 April 2026 | 5 hours 24 minutes | National Airspace System |
| 28 May 2026 | 4 hours 59 minutes | National Airspace System |
Delay causes
Why OO 5578 runs late
National Airspace System accounts for 47% of the 7,898 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 24%Carrier
- 23%Late-arriving aircraft
- 6%Extreme weather
47% 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 3,687 minutes out of 7,898, against a national NAS share of 21%. The split is drawn from 7,898 delay minutes reported on OO 5578.
Cancellations are rare at 0.34%, 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
13.4% 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 620 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 one other city pair in the data, including DEN to CPR (55), but none flew often enough under OO 5578 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PSC to SFO only.
One caution: this is a thin sample. 291 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 5578
For a booking, OO 5578 is a flight to put a long connection behind. 13.4% 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
- San Francisco International (SFO) 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.