PlainFlights

Route · SAT → STL · 2020–2025 BTS data

San Antonio to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SAT to STL (San Antonio to St. Louis) ranks #3777 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

87.9%
On-time
+8.9 pts
vs US avg
54 min
Delay when late
2,083
Flights
#3777 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Oct 2024 96%

Worst Month

May 2024 72%

Distance

786 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 40 6 0 0 WN
Nov 2025 33 7 0 0 WN
Oct 2025 53 5 0 0 WN
Sep 2025 47 3 0 0 WN
Aug 2025 47 4 0 0 WN
Jul 2025 53 6 0 0 WN
Jun 2025 52 9 0 0 WN
May 2025 56 6 1 0 WN
Apr 2025 56 9 0 0 WN
Mar 2025 54 8 0 0 WN
Feb 2025 36 1 0 0 WN
Jan 2025 33 4 3 0 WN
Dec 2024 40 7 0 0 WN
Nov 2024 33 2 0 0 WN
Oct 2024 52 2 0 0 WN
Sep 2024 47 3 0 0 WN
Aug 2024 48 4 0 0 WN
Jul 2024 53 13 2 0 WN
Jun 2024 51 9 0 0 WN
May 2024 57 16 0 0 WN
Apr 2024 55 10 1 0 WN
Mar 2024 48 11 0 0 WN
Jan 2024 32 1 3 1 WN
Dec 2023 37 11 0 0 WN

SAT–STL seasonal on-time pattern

Best: January (92.9%) · weakest: December (83.4%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 83.4%

Strongest calendar month

January

92.9% on-time · ~39 flights/mo

Busiest calendar month

March

~47 flights/mo avg

Weakest calendar month

December

83.4% on-time · ~36 flights/mo

Cancellation Rate

0.9%

10 of 1,113 flights

Diversion Rate

0.1%

1 of 1,113 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SAT - San Antonio

Full on-time, delay-cause, and seasonal performance for San Antonio, TX.

SAT on-time profile

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

Compare the two airports

See SAT and STL side by side on delays, cancellations, and reliability.

Compare SAT vs STL

Origin-hub reliability standing

Among SAT's stronger departures

SAT → STL posts a 87.9% on-time rate, landing in the ≥85% band with 17 of 31 BTS-tracked routes leaving San Antonio. The same hub also shows 12 mid-band and 2 challenged departures · fleet-wide on-time rank #440 of 4927 (highest on-time = #1).

What the Data Says About SAT to STL

San Antonio to St. Louis (SAT to STL) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.9% on-time rate across 2,083 flights, with delays that do happen averaging 53.6 minutes. The corridor runs roughly 786 miles and is served by 1 carrier. Over the most recent 24 months, 10 of 1,113 flights were cancelled (0.9%) and 1 diverted (0.1%).

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 96% on-time, while May 2024 came in at just 72% - a 24-point swing worth factoring into travel timing.

On the multi-year calendar, SAT–STL peaks in January at 92.9% on-time while March carries the heaviest traffic (~47 flights per month) ; the softest month is December at 83.4%, a 9.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SAT to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SAT to STL ranks #3777 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SAT to STL? ▼
Flights from San Antonio to St. Louis have a 87.9% on-time rate based on 2,083 flights. The average delay is 53.6 minutes. The best recent month was Oct 2024 with 96% on-time.
What is the cancellation rate for SAT to STL? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (10 of 1,113 flights) and 0.1% were diverted.
How far is the flight from SAT to STL? ▼
The flight distance from San Antonio (SAT) to St. Louis (STL) is approximately 786 miles. This route is served by 1 carrier.
When is the best time to fly from SAT to STL? ▼
The best recent month for on-time performance was Oct 2024 (96% on-time). The worst was May 2024 (72% on-time). Consider booking during months with historically better performance.

Airports on this route

SAT Airport

San Antonio
STL Airport

St. Louis
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 SAT–STL data

SAT–STL runs 8.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SAT and STL airport profiles: delay causes and top routes differ even on the same corridor. SAT airport
  • If your dates flex, January (92.9% on-time) beats December (83.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 87.9% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.