Route · STL → SAN · 2020–2025 BTS data
St. Louis to San Diego
The STL–SAN corridor (St. Louis, MO → San Diego, CA) runs behind the national average, served by 1 carrier across roughly 1,557 miles.
Data updated 2026-06-13
- 78.3%
- On-time
- -0.7 pts
- vs US avg
- 54 min
- Delay when late
- 2,630
- Flights
Cancelled
0.3%
Best Month
Sep 2024 85%
Worst Month
May 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 | 16 | 0 | 0 | WN |
| Nov 2025 | 48 | 11 | 0 | 0 | WN |
| Oct 2025 | 57 | 16 | 0 | 0 | WN |
| Sep 2025 | 34 | 7 | 0 | 1 | WN |
| Aug 2025 | 36 | 13 | 0 | 0 | WN |
| Jul 2025 | 39 | 16 | 0 | 0 | WN |
| Jun 2025 | 39 | 13 | 0 | 0 | WN |
| May 2025 | 39 | 8 | 0 | 0 | WN |
| Apr 2025 | 41 | 14 | 0 | 0 | WN |
| Mar 2025 | 53 | 8 | 0 | 0 | WN |
| Feb 2025 | 43 | 9 | 0 | 0 | WN |
| Jan 2025 | 40 | 11 | 2 | 1 | WN |
| Dec 2024 | 46 | 10 | 1 | 2 | WN |
| Nov 2024 | 48 | 3 | 0 | 0 | WN |
| Oct 2024 | 50 | 10 | 0 | 0 | WN |
| Sep 2024 | 60 | 9 | 0 | 0 | WN |
| Aug 2024 | 62 | 10 | 0 | 0 | WN |
| Jul 2024 | 62 | 16 | 0 | 0 | WN |
| Jun 2024 | 58 | 18 | 0 | 0 | WN |
| May 2024 | 54 | 19 | 0 | 0 | WN |
| Apr 2024 | 45 | 10 | 0 | 0 | WN |
| Jan 2024 | 32 | 9 | 0 | 0 | WN |
| Dec 2023 | 37 | 5 | 0 | 0 | WN |
| Nov 2023 | 37 | 2 | 0 | 0 | WN |
Cancellation Rate
0.3%
3 of 1,106 flights
Diversion Rate
0.4%
4 of 1,106 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Origin airport →SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Destination airport →Compare the two airports
See STL and SAN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–SAN.
Routes with a similar on-time rate
What the Data Says About STL to SAN
The St. Louis to San Diego corridor (STL to SAN) posts a 78.3% on-time rate on the lower edge of the average band, based on 2,630 tracked flights. Late flights run 53.9 minutes behind on average. 1 carrier cover the 1,557-mile route; over the last 24 months, 3 of 1,106 flights were cancelled (0.3%) and 0.4% diverted.
The monthly split is wide on this route: Sep 2024 posted the strongest performance at 85% on-time, while May 2024 came in at just 65% - a 20-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from STL to SAN? ▼
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Flight Guides
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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.