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1,266 km · Domestic

San Antonio (SAT) – St. Louis Lambert (STL)

In July 2026, 108 flights operated between San Antonio and St. Louis Lambert (both directions), and 75.0% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January5958▼ 1.7%
February7154▼ 23.9%
March107108▲ 0.9%
April1121120.0%
May111112▲ 0.9%
June1041040.0%
July106108▲ 1.9%
August93––
September94––
October106–in progress
November66––
December80––
Year to date (Jan–Jul)670656▼ 2.1%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January86.4%89.7%▲ 3.8%
February91.5%90.7%▼ 0.9%
March84.1%75.9%▼ 9.8%
April80.4%82.1%▲ 2.1%
May77.5%77.7%▲ 0.3%
June76.9%58.7%▼ 23.7%
July79.2%75.0%▼ 5.3%
August83.9%––
September89.4%––
October84.0%–in progress
November80.3%––
December75.0%––
Year-to-date average (Jan–Jul)82.3%78.5%▼ 4.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January60▼ 100.0%
February10▼ 100.0%
March10▼ 100.0%
April00–
May10▼ 100.0%
June00–
July00–
August1––
September0––
October0–in progress
November0––
December0––
Year to date (Jan–Jul)90▼ 100.0%

By direction

SAT → STL

Scheduled flights
995
Flights operated
991
Cancelled
4 · 0.4%
On-time departures
83.7%

STL → SAT

Scheduled flights
994
Flights operated
988
Cancelled
6 · 0.6%
On-time departures
77.6%

SAT → STL and STL → SAT counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 1,989 100.0% 80.6% 10

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Recorded flights1,989SAT–STL

Departure hour

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 142 · 142 recorded · 140 measured · Source: the US BTS 06:00 · 44 · 44 recorded · 44 measured · Source: the US BTS 07:00 · 173 · 173 recorded · 173 measured · Source: the US BTS 08:00 · 176 · 176 recorded · 176 measured · Source: the US BTS 09:00 · 147 · 147 recorded · 146 measured · Source: the US BTS 10:00 · 198 · 198 recorded · 198 measured · Source: the US BTS 11:00 · 107 · 107 recorded · 105 measured · Source: the US BTS 12:00 · 135 · 135 recorded · 134 measured · Source: the US BTS 13:00 · 32 · 32 recorded · 32 measured · Source: the US BTS 14:00 · 75 · 75 recorded · 75 measured · Source: the US BTS 15:00 · 116 · 116 recorded · 116 measured · Source: the US BTS 16:00 · 198 · 198 recorded · 198 measured · Source: the US BTS 17:00 · 133 · 133 recorded · 132 measured · Source: the US BTS 18:00 · 63 · 63 recorded · 63 measured · Source: the US BTS 19:00 · 58 · 58 recorded · 57 measured · Source: the US BTS 20:00 · 43 · 43 recorded · 42 measured · Source: the US BTS 21:00 · 79 · 79 recorded · 79 measured · Source: the US BTS 22:00 · 70 · 70 recorded · 69 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00Fewer than 200 measured departures—140142
06:00Fewer than 200 measured departures—4444
07:00Fewer than 200 measured departures—173173
08:00Fewer than 200 measured departures—176176
09:00Fewer than 200 measured departures—146147
10:00Fewer than 200 measured departures—198198
11:00Fewer than 200 measured departures—105107
12:00Fewer than 200 measured departures—134135
13:00Fewer than 200 measured departures—3232
14:00Fewer than 200 measured departures—7575
15:00Fewer than 200 measured departures—116116
16:00Fewer than 200 measured departures—198198
17:00Fewer than 200 measured departures—132133
18:00Fewer than 200 measured departures—6363
19:00Fewer than 200 measured departures—5758
20:00Fewer than 200 measured departures—4243
21:00Fewer than 200 measured departures—7979
22:00Fewer than 200 measured departures—6970
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 79.1% · 318 recorded · 316 measured · Source: the US BTS Tuesday · 86.4% · 294 recorded · 294 measured · Source: the US BTS Wednesday · 84.0% · 290 recorded · 288 measured · Source: the US BTS Thursday · 77.9% · 316 recorded · 316 measured · Source: the US BTS Friday · 80.1% · 322 recorded · 322 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 177 recorded · 177 measured · Source: the US BTS Sunday · 75.2% · 272 recorded · 266 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 11.8 min · 318 recorded · 316 measured · Source: the US BTS Tuesday · 4.8 min · 294 recorded · 294 measured · Source: the US BTS Wednesday · 5.4 min · 290 recorded · 288 measured · Source: the US BTS Thursday · 10.9 min · 316 recorded · 316 measured · Source: the US BTS Friday · 11.2 min · 322 recorded · 322 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 177 recorded · 177 measured · Source: the US BTS Sunday · 13.6 min · 272 recorded · 266 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 318 · 318 recorded · 316 measured · Source: the US BTS Tuesday · 294 · 294 recorded · 294 measured · Source: the US BTS Wednesday · 290 · 290 recorded · 288 measured · Source: the US BTS Thursday · 316 · 316 recorded · 316 measured · Source: the US BTS Friday · 322 · 322 recorded · 322 measured · Source: the US BTS Saturday · 177 · 177 recorded · 177 measured · Source: the US BTS Sunday · 272 · 272 recorded · 266 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday79.1%11.8 min316318
Tuesday86.4%4.8 min294294
Wednesday84.0%5.4 min288290
Thursday77.9%10.9 min316316
Friday80.1%11.2 min322322
SaturdayFewer than 200 measured departures—177177
Sunday75.2%13.6 min266272

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 123 recorded · 117 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 126 recorded · 125 measured · Source: the US BTS Mar · 80.0% · 216 recorded · 215 measured · Source: the US BTS Apr · 81.3% · 224 recorded · 224 measured · Source: the US BTS May · 77.6% · 224 recorded · 223 measured · Source: the US BTS Jun · 67.8% · 208 recorded · 208 measured · Source: the US BTS Jul · 77.1% · 214 recorded · 214 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 94 recorded · 93 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 94 recorded · 94 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 174 recorded · 174 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 132 recorded · 132 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 160 recorded · 160 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 123 recorded · 117 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 126 recorded · 125 measured · Source: the US BTS Mar · 9.5 min · 216 recorded · 215 measured · Source: the US BTS Apr · 7.3 min · 224 recorded · 224 measured · Source: the US BTS May · 14.0 min · 224 recorded · 223 measured · Source: the US BTS Jun · 19.2 min · 208 recorded · 208 measured · Source: the US BTS Jul · 10.2 min · 214 recorded · 214 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 94 recorded · 93 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 94 recorded · 94 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 174 recorded · 174 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 132 recorded · 132 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 160 recorded · 160 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 123 · 123 recorded · 117 measured · Source: the US BTS Feb · 126 · 126 recorded · 125 measured · Source: the US BTS Mar · 216 · 216 recorded · 215 measured · Source: the US BTS Apr · 224 · 224 recorded · 224 measured · Source: the US BTS May · 224 · 224 recorded · 223 measured · Source: the US BTS Jun · 208 · 208 recorded · 208 measured · Source: the US BTS Jul · 214 · 214 recorded · 214 measured · Source: the US BTS Aug · 94 · 94 recorded · 93 measured · Source: the US BTS Sep · 94 · 94 recorded · 94 measured · Source: the US BTS Oct · 174 · 174 recorded · 174 measured · Source: the US BTS Nov · 132 · 132 recorded · 132 measured · Source: the US BTS Dec · 160 · 160 recorded · 160 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—117123
FebFewer than 200 measured departures—125126
Mar80.0%9.5 min215216
Apr81.3%7.3 min224224
May77.6%14.0 min223224
Jun67.8%19.2 min208208
Jul77.1%10.2 min214214
AugFewer than 200 measured departures—9394
SepFewer than 200 measured departures—9494
OctFewer than 200 measured departures—174174
NovFewer than 200 measured departures—132132
DecFewer than 200 measured departures—160160

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 80.2% 1,596
  • Delayed >15 min 19.3% 383
  • Cancelled 0.5% 10
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

22
22 of 22
Flight numbersBy direction DeparturesOn time
WN833 STL → SAT 77 93.3%
WN3734 SAT → STL 76 89.3%
WN2581 STL → SAT 57 91.2%
WN2599 STL → SAT 57 94.7%
WN4429 STL → SAT 52 65.4%
WN4443 SAT → STL 51 84.3%
WN4634 STL → SAT 51 80.4%
WN3015 SAT → STL 50 92.0%
WN4410 STL → SAT 50 88.0%
WN3979 STL → SAT 49 55.1%
WN4517 STL → SAT 49 61.2%
WN4809 SAT → STL 49 89.8%
WN2802 STL → SAT 46 84.8%
WN4175 SAT → STL 42 57.1%
WN4444 SAT → STL 42 73.8%
WN3703 SAT → STL 39 87.2%
WN4240 SAT → STL 39 94.9%
WN1436 SAT → STL 34 85.3%
WN2309 STL → SAT 33 87.5%
WN4404 SAT → STL 33 93.9%
WN2163 STL → SAT 31 83.9%
WN849 SAT → STL 31 96.8%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 108 +1.9% 0 75.0%
June 2026 104 +0.0% 0 58.7%
May 2026 112 +0.9% 0 77.7%
April 2026 112 +0.0% 0 82.1%
March 2026 108 +0.9% 0 75.9%
February 2026 54 −23.9% 0 90.7%
January 2026 58 −1.7% 0 89.7%
December 2025 80 +0.0% 0 75.0%
November 2025 66 +0.0% 0 80.3%
October 2025 106 +55.9% 0 84.0%
September 2025 94 0 89.4%
August 2025 93 1 83.9%
July 2025 106 0 79.2%
June 2025 104 0 76.9%
May 2025 111 1 77.5%
April 2025 112 0 80.4%
March 2025 107 1 84.1%
February 2025 71 1 91.5%
January 2025 59 6 86.4%
December 2024 80 0 77.5%
November 2024 66 0 87.9%
October 2024 68 0 91.2%

How to read this chart

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