STL to SAN flight delays
St. Louis, MO (STL) San Diego, CA (SAN) · 1,557 miles
1,057 flights · July 2024 – July 2026 · US Bureau of Transportation Statistics
77.12%
Arrived on time
Within 15 minutes of schedule
0.38%
Cancelled
Share of scheduled flights
51 min
When late, late by
Average across delayed arrivals
13 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In November it ran 35.9 points more punctual than in June — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Only Southwest Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
The St. Louis to San Diego route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over July 2024 – July 2026, Southwest Airlines arrived on time most often on STL to SAN. Flights ran closest to schedule in March and worst in June.
Every airline on STL to SAN
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,057 | 77.12% | 0.38% | 51 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SAN to STL San Diego back to St. Louis 77.6% on time COther routes from St. Louis
Common questions
Are flights from St. Louis to San Diego usually delayed?
77.12% of flights on the STL to SAN route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from St. Louis to San Diego?
Only Southwest Airlines appears in the published record on this route, with 1,057 flights and 77.12% arriving on time.
How often are STL to SAN flights cancelled?
0.38% of scheduled flights did not operate — about 4 in every thousand. That is in the normal range.
What is the best month to fly St. Louis to San Diego?
November, when 93.8% of flights arrived on time. The worst was June at 57.9%.
When STL to SAN flights are late, how late are they?
About 51 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on STL to SAN during July 2024 – July 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →