Route
STL → SAN
St. Louis Lambert International Airport San Diego International Airport
Alerts at STL 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
- 77.4%
- Less than 15 minutes late
- Cancelled
- 0.2%
- Of scheduled flights
- Average delay when late
- 51 min
- Flights arriving 15+ minutes late
- Flights tracked
- 470
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 38%
- Airline (crew, maintenance, cleaning) 32%
- Air traffic control & airport 26%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 78.8% | 34 |
| October 2025 | 71.9% | 57 |
| November 2025 | 77.1% | 48 |
| December 2025 | 65.2% | 46 |
| January 2026 | 85.7% | 35 |
| February 2026 | 77.1% | 35 |
| March 2026 | 88.6% | 36 |
| April 2026 | 91.2% | 34 |
| May 2026 | 88.9% | 36 |
| June 2026 | 57.9% | 38 |
| July 2026 | 89.5% | 38 |
| August 2026 | 63.6% | 33 |
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 |
|---|---|---|---|---|
| Southwest Airlines | 470 | 77.4% | 0.2% | 51 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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