Route
STS → SAN
Charles M. Schulz Sonoma County Airport San Diego International Airport
Alerts at STS and SAN
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Watch Ground Delay Program SAN
Ground Delay Program at San Diego International Airport (SAN): Average 37 minutes, up to 1 hour and 11 minutes
Reason: airport volume
Airport status
How punctual is this route?
- On-time arrivals
- 73.3%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,060
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 35%
- Air traffic control & airport 32%
- Airline (crew, maintenance, cleaning) 29%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.2% | 81 |
| October 2025 | 80.5% | 86 |
| November 2025 | 75.0% | 88 |
| December 2025 | 63.0% | 52 |
| January 2026 | 78.0% | 54 |
| February 2026 | 65.9% | 44 |
| March 2026 | 76.8% | 69 |
| April 2026 | 75.0% | 112 |
| May 2026 | 80.6% | 125 |
| June 2026 | 74.8% | 116 |
| July 2026 | 70.5% | 111 |
| August 2026 | 62.5% | 122 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| SkyWest Airlines | 830 | 72.9% | 3.7% | 64 min |
| Southwest Airlines | 230 | 74.7% | 0.4% | 64 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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OO3315
12% late · 303 flights
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OO3047
45% late · 203 flights
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OO3254
36% late · 62 flights
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WN4813
12% late · 60 flights
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WN4140
4% late · 57 flights
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WN3994
69% late · 36 flights
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OO3103
20% late · 35 flights
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OO3322
16% late · 33 flights
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OO3409
33% late · 33 flights
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WN4525
34% late · 32 flights
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OO3420
39% late · 28 flights
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WN3900
7% late · 28 flights
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OO3221
27% late · 26 flights
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OO3205
30% late · 24 flights
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