Route · STL → SAN · 2020–2025 BTS data
St. Louis to San Diego
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to SAN (St. Louis to San Diego) ranks #3468 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 78.3%
- On-time
- -0.7 pts
- vs US avg
- 54 min
- Delay when late
- 2,630
- Flights
- #3468 of 4927
- Corpus placement
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 |
STL–SAN seasonal on-time pattern
Best: February (88.5%) · weakest: July (71.1%)
Strongest calendar month
February
88.5% on-time · ~48 flights/mo
Busiest calendar month
February
~48 flights/mo avg
Weakest calendar month
July
71.1% on-time · ~47 flights/mo
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.
STL on-time profileSAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
SAN on-time profileCompare the two airports
See STL and SAN side by side on delays, cancellations, and reliability.
Compare STL vs SANOrigin-hub reliability standing
Mid-pack among STL departures
From STL, this corridor sits with 45 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 1 below 75%). Destination: San Diego · fleet on-time rank #3765 of 4927.
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.
On the multi-year calendar, STL–SAN peaks in February at 88.5% on-time ; the softest month is July at 71.1%, a 17.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does STL to SAN rank among US routes by traffic? ▼
How often are flights delayed from STL to SAN? ▼
What is the cancellation rate for STL to SAN? ▼
How far is the flight from STL to SAN? ▼
When is the best time to fly from STL to SAN? ▼
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 STL–SAN data
STL–SAN is mid-pack at 78.3% on-time; month and carrier mix move more than the corridor headline.
- Compare STL and SAN airport profiles: delay causes and top routes differ even on the same corridor. STL airport
- If your dates flex, February (88.5% on-time) beats July (71.1%) on this corridor. Seasonal chart
- 4 other routes post a similar 78.3% 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.