BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
STL→LAX

St. Louis, MO (STL) to Los Angeles, CA (LAX) flight delay odds

Historically, 73.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,028 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
73.8%arrived on time
14.4%30+ min late
0.2%cancelled
1,028scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.5%all scheduled flights
120+ minutes late2.3%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+12.8 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning59180.2%10.3%0.3%
Late morning10983.5%6.4%0.0%
Afternoon6567.7%15.4%0.0%
Evening15867.7%20.9%0.0%
Night10541.0%35.2%0.0%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday15960.4%25.2%0.0%
Tuesday13782.5%11.7%0.0%
Wednesday13083.1%6.2%0.0%
Thursday15473.4%14.3%0.6%
Friday16173.3%13.0%0.0%
Saturday13377.4%12.0%0.0%
Sunday15470.1%16.2%0.6%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines67473.3%15.3%0.0%
SkyWest Airlines35474.9%12.7%0.6%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20259377.4%18.3%0.0%
August 20259283.7%10.9%0.0%
September 20258286.6%4.9%0.0%
October 20259661.5%18.8%0.0%
November 202510181.2%13.9%0.0%
December 202510370.9%14.6%0.0%
January 20267573.3%13.3%0.0%
February 20267474.3%10.8%0.0%
March 20267676.3%9.2%1.3%
April 20267353.4%20.5%1.4%
May 20267576.0%14.7%0.0%
June 20268869.3%21.6%0.0%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline56.4%
Late aircraft26.7%
National airspace9.6%
Weather7.2%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.