Carrier route record
OOSTS→SAN
SkyWest Airlines · Santa Rosa to San Diego
- Flights
- 830
- Period
- September 2025 to August 2026
- Share of route
- 78%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on STS to SAN carries a cancellation problem, not just a delay problem: 3.7% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about seven flights in ten arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 830 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so SkyWest on STS to SAN runs 4 points behind the country as a whole. Across a thousand flights that is about 44 extra late arrivals.
Key figures
On time
72.9%
Arrivals under 15 minutes late, of 797 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
3.73%
National rate is 1.89%
Whole route
73.3%
Every carrier on STS to SAN, 1,060 flights
These figures cover 830 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on STS to SAN
SkyWest flew 830 of the 1,060 flights on STS to SAN, most of the route. Its 72.9% on time is about level with the route as a whole at 73.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Southwest at 74.7% to SkyWest at 72.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlinesthin sample | 230 | 74.7% | 60 min | 0.43% | C+ |
| SkyWest Airlines (this page) | 830 | 72.9% | 60 min | 3.73% | C− |
Flight by flight
SkyWest flight numbers on STS to SAN
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.
Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 31 points, against half a point between the best and worst carrier.
- 5am–8am278 flights90.1%
- 8am–11am73 flights69.9%
- 11am–2pm132 flights63.4%
- 2pm–5pm107 flights72.0%
- 5pm–8pm194 flights61.6%
- 8pm–5am46 flights59.1%
Scale runs 50% to 95%.
The 8pm–5am window is where this operation falls apart: 59.1% on time, against 90.1% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 278 flights scheduled in it.
Across the year
SkyWest on STS to SAN through the year
August is the worst month at 56.3% on time, 24 points below October, the best at 80.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. November was the busiest month here, with 88 flights.
Across the week, Wednesday is the strongest day at 83.8% on time and Thursday the weakest at 61.3%, a spread of 23 points.
Arrival by arrival
How late SkyWest on STS to SAN runs when it is late
The 216 late arrivals split 72 under half an hour, 78 between 30 and 60 minutes, and 66 an hour or more.
- 15+ min early148 flights18.6%
- Within 15 min433 flights54.3%
- 15–29 min late72 flights9.0%
- 30–59 min late78 flights9.8%
- 1–2 hours late41 flights5.1%
- 2+ hours late25 flights3.1%
Scale runs 0% to 100%.
Share of 797 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 144 departures that left 15 minutes late or more, only 10 made it up before arrival. In the other direction, 82 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 SAN.
The worst days
Worst days for SkyWest on STS to SAN
The latest arrival of the period was on 20 September 2025, 6 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in May 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 September 2025 | 6 hours 32 minutes | Late-arriving aircraft |
| 27 May 2026 | 5 hours 56 minutes | Carrier |
| 16 May 2026 | 5 hours 50 minutes | Late-arriving aircraft |
| 21 May 2026 | 3 hours 57 minutes | Carrier |
| 14 November 2025 | 3 hours 28 minutes | Late-arriving aircraft |
Delay causes
Why SkyWest runs late on this route
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 13,000 reported delay minutes.
- 33%National Airspace System
- 31%Late-arriving aircraft
- 30%Carrier
- 6%Extreme weather
33% 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 4,260 minutes out of 13,000, against a national NAS share of 21%. The split is drawn from 12,870 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.1% on time here.
Cancellations run at 3.73%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
8.3% 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.
The 508 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 return leg is a different operation and performs like one: it runs 80.1% on time across 833 flights, 7 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 7 points of difference.
One caution: this is a thin sample. 830 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 SkyWest on STS to SAN
Put together: the delay figures matter less here than the 3.73% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 797 completed flights over 12 months sit behind that.
Related
Where to go next
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.