Route · SAN → STL · 2020–2025 BTS data
San Diego to St. Louis
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SAN to STL (San Diego to St. Louis) ranks #3433 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 84%
- On-time
- +5 pts
- vs US avg
- 58 min
- Delay when late
- 2,722
- Flights
- #3433 of 4927
- Corpus placement
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 |
SAN–STL seasonal on-time pattern
Best: February (92.9%) · weakest: December (77.2%)
Strongest calendar month
February
92.9% on-time · ~50 flights/mo
Busiest calendar month
February
~50 flights/mo avg
Weakest calendar month
December
77.2% on-time · ~40 flights/mo
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.
SAN on-time profileSTL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
STL on-time profileCompare the two airports
See SAN and STL side by side on delays, cancellations, and reliability.
Compare SAN vs STLOrigin-hub reliability standing
Mid-pack among SAN departures
From SAN, this corridor sits with 34 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (13 at ≥85%) and not the softest ( 4 below 75%). Destination: St. Louis · fleet on-time rank #1587 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SAN–STL.
Routes with a similar on-time rate
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.
On the multi-year calendar, SAN–STL peaks in February at 92.9% on-time ; the softest month is December at 77.2%, a 15.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SAN to STL rank among US routes by traffic? ▼
How often are flights delayed from SAN to STL? ▼
What is the cancellation rate for SAN to STL? ▼
How far is the flight from SAN to STL? ▼
When is the best time to fly from SAN to STL? ▼
Airports on this route
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.
Using SAN–STL data
SAN–STL runs 5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SAN and STL airport profiles: delay causes and top routes differ even on the same corridor. SAN airport
- If your dates flex, February (92.9% on-time) beats December (77.2%) on this corridor. Seasonal chart
- 4 other routes post a similar 84% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.