Route · STL → SAT · 2020–2025 BTS data
St. Louis to San Antonio
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to SAT (St. Louis to San Antonio) ranks #3747 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 79.6%
- On-time
- +0.6 pts
- vs US avg
- 59 min
- Delay when late
- 2,127
- Flights
- #3747 of 4927
- Corpus placement
Cancelled
0.6%
Best Month
Mar 2025 89%
Worst Month
Jul 2024 66%
Distance
786 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 40 | 11 | 0 | 0 | WN |
| Nov 2025 | 33 | 3 | 0 | 0 | WN |
| Oct 2025 | 53 | 7 | 0 | 1 | WN |
| Sep 2025 | 47 | 6 | 0 | 0 | WN |
| Aug 2025 | 47 | 12 | 1 | 0 | WN |
| Jul 2025 | 53 | 10 | 0 | 0 | WN |
| Jun 2025 | 52 | 14 | 0 | 0 | WN |
| May 2025 | 56 | 19 | 0 | 0 | WN |
| Apr 2025 | 56 | 13 | 0 | 0 | WN |
| Mar 2025 | 54 | 6 | 1 | 0 | WN |
| Feb 2025 | 36 | 4 | 1 | 0 | WN |
| Jan 2025 | 32 | 4 | 3 | 0 | WN |
| Dec 2024 | 40 | 10 | 0 | 0 | WN |
| Nov 2024 | 33 | 4 | 0 | 0 | WN |
| Oct 2024 | 52 | 7 | 0 | 0 | WN |
| Sep 2024 | 47 | 6 | 0 | 0 | WN |
| Aug 2024 | 48 | 9 | 0 | 0 | WN |
| Jul 2024 | 53 | 18 | 0 | 1 | WN |
| Jun 2024 | 51 | 8 | 0 | 0 | WN |
| May 2024 | 57 | 19 | 0 | 0 | WN |
| Apr 2024 | 56 | 15 | 0 | 0 | WN |
| Mar 2024 | 52 | 11 | 0 | 0 | WN |
| Jan 2024 | 32 | 6 | 1 | 0 | WN |
| Dec 2023 | 37 | 5 | 0 | 0 | WN |
STL–SAT seasonal on-time pattern
Best: February (89.9%) · weakest: June (70.1%)
Strongest calendar month
February
89.9% on-time · ~45 flights/mo
Busiest calendar month
March
~50 flights/mo avg
Weakest calendar month
June
70.1% on-time · ~41 flights/mo
Cancellation Rate
0.6%
7 of 1,117 flights
Diversion Rate
0.2%
2 of 1,117 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 profileSAT - San Antonio
Full on-time, delay-cause, and seasonal performance for San Antonio, TX.
SAT on-time profileCompare the two airports
See STL and SAT side by side on delays, cancellations, and reliability.
Compare STL vs SATOrigin-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 Antonio · fleet on-time rank #3323 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–SAT.
Routes with a similar on-time rate
Routes of a similar trip length
What the Data Says About STL to SAT
2,127 tracked flights put the STL to SAT pairing (St. Louis to San Antonio) at a 79.6% on-time rate, squarely in line with the wider network. Delays that do occur run 58.6 minutes on average. Across the 786-mile route and its 1 carrier, the trailing 24 months show 0.6% cancelled and 0.2% diverted (1,117 flights sampled).
The monthly split is wide on this route: Mar 2025 posted the strongest performance at 89% on-time, while Jul 2024 came in at just 66% - a 23-point swing worth factoring into travel timing.
On the multi-year calendar, STL–SAT peaks in February at 89.9% on-time while March carries the heaviest traffic (~50 flights per month) ; the softest month is June at 70.1%, a 19.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does STL to SAT rank among US routes by traffic? ▼
How often are flights delayed from STL to SAT? ▼
What is the cancellation rate for STL to SAT? ▼
How far is the flight from STL to SAT? ▼
When is the best time to fly from STL to SAT? ▼
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–SAT data
STL–SAT is mid-pack at 79.6% on-time; month and carrier mix move more than the corridor headline.
- Compare STL and SAT airport profiles: delay causes and top routes differ even on the same corridor. STL airport
- If your dates flex, February (89.9% on-time) beats June (70.1%) on this corridor. Seasonal chart
- 4 other routes post a similar 79.6% 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.