Route · SAN → STL · 2020–2025 BTS data
San Diego to St. Louis
The SAN–STL corridor (San Diego, CA → St. Louis, MO) runs ahead of the national average, served by 1 carrier across roughly 1,557 miles.
Data updated 2026-06-13
- 84%
- On-time
- +5 pts
- vs US avg
- 58 min
- Delay when late
- 2,722
- Flights
Cancelled
0.4%
Best Month
Oct 2025 95%
Worst Month
Jul 2024 65%
Distance
1,557 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 46 | 15 | 0 | 0 | WN |
| Nov 2025 | 48 | 13 | 0 | 0 | WN |
| Oct 2025 | 57 | 3 | 0 | 0 | WN |
| Sep 2025 | 34 | 5 | 0 | 0 | WN |
| Aug 2025 | 36 | 7 | 0 | 1 | WN |
| Jul 2025 | 39 | 12 | 0 | 0 | WN |
| Jun 2025 | 39 | 7 | 0 | 0 | WN |
| May 2025 | 39 | 7 | 0 | 0 | WN |
| Apr 2025 | 41 | 7 | 0 | 0 | WN |
| Mar 2025 | 53 | 4 | 0 | 0 | WN |
| Feb 2025 | 43 | 4 | 0 | 0 | WN |
| Jan 2025 | 40 | 10 | 2 | 1 | WN |
| Dec 2024 | 46 | 17 | 1 | 0 | WN |
| Nov 2024 | 48 | 9 | 0 | 0 | WN |
| Oct 2024 | 50 | 14 | 0 | 0 | WN |
| Sep 2024 | 60 | 5 | 0 | 0 | WN |
| Aug 2024 | 61 | 16 | 0 | 0 | WN |
| Jul 2024 | 62 | 22 | 0 | 0 | WN |
| Jun 2024 | 58 | 12 | 1 | 0 | WN |
| May 2024 | 54 | 5 | 0 | 0 | WN |
| Apr 2024 | 50 | 9 | 0 | 0 | WN |
| Mar 2024 | 42 | 6 | 0 | 0 | WN |
| Jan 2024 | 32 | 7 | 0 | 0 | WN |
| Dec 2023 | 37 | 8 | 0 | 0 | WN |
Cancellation Rate
0.4%
4 of 1,115 flights
Diversion Rate
0.2%
2 of 1,115 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Origin airport →STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Destination airport →Compare the two airports
See SAN and STL side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SAN–STL.
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What the Data Says About SAN to STL
Bureau of Transportation Statistics records show San Diego to St. Louis (SAN to STL) running a 84% on-time rate over 2,722 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 58.0 minutes. The 1,557-mile corridor is served by 1 carrier, and over the last 24 months 0.4% of 1,115 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 95% on-time, while Jul 2024 came in at just 65% - a 30-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.