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

San Diego, CA (SAN) to St. Louis, MO (STL) flight delay odds

75.5% of 474 official scheduled SAN-to-STL flights arrived on time; 14.8% arrived at least 30 minutes late and 0.2% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
75.5%arrived on time
14.8%30+ min late
0.2%cancelled
474scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.2%all scheduled flights
120+ minutes late0.8%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+5.3 mincompleted flights

Which departure time was most reliable for SAN to STL?

Among qualifying SAN-to-STL departure window results, Early morning had the highest on-time rate: 88.9% of 144 flights. Afternoon was lowest at 58.8% across 136 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning14488.9%4.9%0.0%
Late morning13781.0%8.8%0.7%
Afternoon13658.8%28.7%0.0%
Evening5768.4%21.1%0.0%

Which weekday was most reliable for SAN to STL?

Among qualifying SAN-to-STL weekday results, Wednesday had the highest on-time rate: 86.0% of 57 flights. Friday was lowest at 66.2% across 68 flights.

DayFlightsOn time30+ minCancelled
Monday6368.3%15.9%0.0%
Tuesday6081.7%11.7%0.0%
Wednesday5786.0%5.3%0.0%
Thursday6272.6%14.5%1.6%
Friday6866.2%25.0%0.0%
Saturday7982.3%11.4%0.0%
Sunday8572.9%17.6%0.0%

Which airline was most reliable for SAN to STL?

Only Southwest Airlines met the SAN-to-STL airline threshold: 75.5% of 474 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines47475.5%14.8%0.2%

Which month was most reliable for SAN to STL?

Among qualifying SAN-to-STL month results, October 2025 had the highest on-time rate: 94.7% of 57 flights. June 2026 was lowest at 52.6% across 38 flights.

MonthFlightsOn time30+ minCancelled
July 20253969.2%10.3%0.0%
August 20253677.8%13.9%0.0%
September 20253485.3%2.9%0.0%
October 20255794.7%1.8%0.0%
November 20254872.9%20.8%0.0%
December 20254667.4%23.9%0.0%
January 20263562.9%17.1%2.9%
February 20263591.4%2.9%0.0%
March 20263677.8%16.7%0.0%
April 20263476.5%8.8%0.0%
May 20263672.2%19.4%0.0%
June 20263852.6%39.5%0.0%

What drove SAN to STL delay minutes?

Late aircraft was the largest recorded SAN-to-STL delay category, accounting for 62.0% of 5,494 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.0%
Late aircraft62.0%
National airspace9.0%
Weather0.0%
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.