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2,501 km · Domestic

San Diego (SAN) – St. Louis Lambert (STL)

In July 2026, 76 flights operated between San Diego and St. Louis Lambert (both directions), and 67.1% 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
January7669▼ 9.2%
February8670▼ 18.6%
March10671▼ 33.0%
April8268▼ 17.1%
May7872▼ 7.7%
June7876▼ 2.6%
July7876▼ 2.6%
August72––
September68––
October114–in progress
November96––
December92––
Year to date (Jan–Jul)584502▼ 14.0%

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
January72.4%76.8%▲ 6.1%
February83.7%80.0%▼ 4.4%
March87.7%70.4%▼ 19.7%
April69.5%73.5%▲ 5.8%
May67.9%73.6%▲ 8.4%
June70.5%55.3%▼ 21.6%
July61.5%67.1%▲ 9.1%
August70.8%––
September75.0%––
October76.3%–in progress
November67.7%––
December63.0%––
Year-to-date average (Jan–Jul)73.3%71.0%▼ 3.2%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January41▼ 75.0%
February00–
March01–
April00–
May00–
June00–
July00–
August0––
September0––
October0–in progress
November0––
December0––
Year to date (Jan–Jul)42▼ 50.0%

By direction

SAN → STL

Scheduled flights
892
Flights operated
888
Cancelled
4 · 0.4%
On-time departures
73.6%

STL → SAN

Scheduled flights
892
Flights operated
888
Cancelled
4 · 0.4%
On-time departures
72.4%

SAN → STL and STL → SAN counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 1,784 100.0% 73.0% 8

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

Lowest average delay08:00–09:008.7min · 236 recorded · 235 measured
Gap to highest-delay hour0.8min08:00 ↔ 09:00
Recorded flights1,784SAN–STL

Departure hour

On-time departures 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 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 141 recorded · 139 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 136 recorded · 135 measured · Source: the US BTS 08:00 · 83.0% · 236 recorded · 235 measured · Source: the US BTS 09:00 · 83.8% · 228 recorded · 228 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 158 recorded · 157 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 107 recorded · 106 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 74 recorded · 74 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 175 recorded · 175 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 60 recorded · 60 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 52 recorded · 52 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 93 recorded · 93 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 54 recorded · 54 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 180 recorded · 179 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 34 recorded · 34 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 46 recorded · 45 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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.

Average departure delay 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 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 141 recorded · 139 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 136 recorded · 135 measured · Source: the US BTS 08:00 · 8.7 min · 236 recorded · 235 measured · Source: the US BTS 09:00 · 9.5 min · 228 recorded · 228 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 158 recorded · 157 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 107 recorded · 106 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 74 recorded · 74 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 175 recorded · 175 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 60 recorded · 60 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 52 recorded · 52 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 93 recorded · 93 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 54 recorded · 54 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 180 recorded · 179 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 34 recorded · 34 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 46 recorded · 45 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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.

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 · 1 · 1 recorded · 1 measured · Source: the US BTS 06:00 · 141 · 141 recorded · 139 measured · Source: the US BTS 07:00 · 136 · 136 recorded · 135 measured · Source: the US BTS 08:00 · 236 · 236 recorded · 235 measured · Source: the US BTS 09:00 · 228 · 228 recorded · 228 measured · Source: the US BTS 10:00 · 158 · 158 recorded · 157 measured · Source: the US BTS 11:00 · 107 · 107 recorded · 106 measured · Source: the US BTS 12:00 · 74 · 74 recorded · 74 measured · Source: the US BTS 13:00 · 175 · 175 recorded · 175 measured · Source: the US BTS 14:00 · 60 · 60 recorded · 60 measured · Source: the US BTS 15:00 · 52 · 52 recorded · 52 measured · Source: the US BTS 16:00 · 93 · 93 recorded · 93 measured · Source: the US BTS 17:00 · 54 · 54 recorded · 54 measured · Source: the US BTS 18:00 · 180 · 180 recorded · 179 measured · Source: the US BTS 19:00 · 34 · 34 recorded · 34 measured · Source: the US BTS 20:00 · 46 · 46 recorded · 45 measured · Source: the US BTS 21:00 · 9 · 9 recorded · 9 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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.

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—11
06:00Fewer than 200 measured departures—139141
07:00Fewer than 200 measured departures—135136
08:0083.0%8.7 min235236
09:0083.8%9.5 min228228
10:00Fewer than 200 measured departures—157158
11:00Fewer than 200 measured departures—106107
12:00Fewer than 200 measured departures—7474
13:00Fewer than 200 measured departures—175175
14:00Fewer than 200 measured departures—6060
15:00Fewer than 200 measured departures—5252
16:00Fewer than 200 measured departures—9393
17:00Fewer than 200 measured departures—5454
18:00Fewer than 200 measured departures—179180
19:00Fewer than 200 measured departures—3434
20:00Fewer than 200 measured departures—4546
21:00Fewer than 200 measured departures—99
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 69.1% · 248 recorded · 246 measured · Source: the US BTS Tuesday · 80.1% · 206 recorded · 206 measured · Source: the US BTS Wednesday · 77.5% · 200 recorded · 200 measured · Source: the US BTS Thursday · 71.0% · 246 recorded · 245 measured · Source: the US BTS Friday · 69.7% · 260 recorded · 257 measured · Source: the US BTS Saturday · 76.7% · 292 recorded · 292 measured · Source: the US BTS Sunday · 69.7% · 332 recorded · 330 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 · 15.7 min · 248 recorded · 246 measured · Source: the US BTS Tuesday · 8.3 min · 206 recorded · 206 measured · Source: the US BTS Wednesday · 10.7 min · 200 recorded · 200 measured · Source: the US BTS Thursday · 15.9 min · 246 recorded · 245 measured · Source: the US BTS Friday · 20.7 min · 260 recorded · 257 measured · Source: the US BTS Saturday · 12.4 min · 292 recorded · 292 measured · Source: the US BTS Sunday · 15.3 min · 332 recorded · 330 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 · 248 · 248 recorded · 246 measured · Source: the US BTS Tuesday · 206 · 206 recorded · 206 measured · Source: the US BTS Wednesday · 200 · 200 recorded · 200 measured · Source: the US BTS Thursday · 246 · 246 recorded · 245 measured · Source: the US BTS Friday · 260 · 260 recorded · 257 measured · Source: the US BTS Saturday · 292 · 292 recorded · 292 measured · Source: the US BTS Sunday · 332 · 332 recorded · 330 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
Monday69.1%15.7 min246248
Tuesday80.1%8.3 min206206
Wednesday77.5%10.7 min200200
Thursday71.0%15.9 min245246
Friday69.7%20.7 min257260
Saturday76.7%12.4 min292292
Sunday69.7%15.3 min330332

Month of year

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

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 150 · 150 recorded · 145 measured · Source: the US BTS Feb · 156 · 156 recorded · 156 measured · Source: the US BTS Mar · 178 · 178 recorded · 177 measured · Source: the US BTS Apr · 150 · 150 recorded · 150 measured · Source: the US BTS May · 150 · 150 recorded · 150 measured · Source: the US BTS Jun · 154 · 154 recorded · 154 measured · Source: the US BTS Jul · 154 · 154 recorded · 154 measured · Source: the US BTS Aug · 72 · 72 recorded · 72 measured · Source: the US BTS Sep · 68 · 68 recorded · 68 measured · Source: the US BTS Oct · 176 · 176 recorded · 176 measured · Source: the US BTS Nov · 192 · 192 recorded · 192 measured · Source: the US BTS Dec · 184 · 184 recorded · 182 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
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—145150
FebFewer than 200 measured departures—156156
MarFewer than 200 measured departures—177178
AprFewer than 200 measured departures—150150
MayFewer than 200 measured departures—150150
JunFewer than 200 measured departures—154154
JulFewer than 200 measured departures—154154
AugFewer than 200 measured departures—7272
SepFewer than 200 measured departures—6868
OctFewer than 200 measured departures—176176
NovFewer than 200 measured departures—192192
DecFewer than 200 measured departures—182184

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 72.7% 1,297
  • Delayed >15 min 26.8% 479
  • Cancelled 0.4% 8
  • 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

12
12 of 12
Flight numbersBy direction DeparturesOn time
WN4238 STL → SAN 59 64.4%
WN4515 STL → SAN 58 86.2%
WN4283 STL → SAN 50 84.0%
WN2401 STL → SAN 47 80.9%
WN334 SAN → STL 44 79.6%
WN297 SAN → STL 42 63.4%
WN3401 STL → SAN 42 64.3%
WN4422 SAN → STL 36 86.1%
WN4442 STL → SAN 36 75.0%
WN3552 SAN → STL 34 26.5%
WN2548 STL → SAN 33 68.8%
WN921 STL → SAN 32 56.3%

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 76 −2.6% 0 67.1%
June 2026 76 −2.6% 0 55.3%
May 2026 72 −7.7% 0 73.6%
April 2026 68 −17.1% 0 73.5%
March 2026 71 −33.0% 1 70.4%
February 2026 70 −18.6% 0 80.0%
January 2026 69 −9.2% 1 76.8%
December 2025 92 +2.2% 0 63.0%
November 2025 96 +0.0% 0 67.7%
October 2025 114 +83.9% 0 76.3%
September 2025 68 0 75.0%
August 2025 72 0 70.8%
July 2025 78 0 61.5%
June 2025 78 0 70.5%
May 2025 78 0 67.9%
April 2025 82 0 69.5%
March 2025 106 0 87.7%
February 2025 86 0 83.7%
January 2025 76 4 72.4%
December 2024 90 2 74.4%
November 2024 96 0 82.3%
October 2024 62 0 82.3%

How to read this chart

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