STL to LAX flight delays
St. Louis, MO (STL) Los Angeles, CA (LAX) · 1,592 miles
1,028 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
74.05%
Arrived on time
Within 15 minutes of schedule
0.19%
Cancelled
Share of scheduled flights
64 min
When late, late by
Average across delayed arrivals
18 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In September it ran 32.4 points more punctual than in April — 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.
The 2 airlines here are separated by under 2 points — close enough to call a tie. Choose on price and departure time.
Flights from St. Louis to Los Angeles run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, SkyWest Airlines arrived on time most often on STL to LAX. Southwest Airlines was late most often. Flights ran closest to schedule in September and worst in April.
Every airline on STL to LAX
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 | 674 | 73.4% | 0% | 50 min | C |
| SkyWest Airlines | 354 | 75.28% | 0.56% | 92 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LAX to STL Los Angeles back to St. Louis 76.98% on time COther routes from St. Louis
Common questions
Are flights from St. Louis to Los Angeles usually delayed?
74.05% of flights on the STL to LAX route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from St. Louis to Los Angeles?
SkyWest Airlines, at 75.28% on time across 354 flights. The least punctual on the route was Southwest Airlines at 73.4%.
How often are STL to LAX flights cancelled?
0.19% of scheduled flights did not operate — about 2 in every thousand. That is in the normal range.
What is the best month to fly St. Louis to Los Angeles?
September, when 86.6% of flights arrived on time. The worst was April at 54.2%.
When STL to LAX flights are late, how late are they?
About 64 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 LAX during January 2025 – August 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 →