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

San Francisco, CA (SFO) to St. Louis, MO (STL) flight delay odds

64.9% of 781 official scheduled SFO-to-STL flights arrived on time; 23.4% arrived at least 30 minutes late and 0.9% 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 SIGNALVariable
64.9%arrived on time
23.4%30+ min late
0.9%cancelled
781scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late12.5%all scheduled flights
120+ minutes late3.2%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+15.2 mincompleted flights

Which departure time was most reliable for SFO to STL?

Among qualifying SFO-to-STL departure window results, Night had the highest on-time rate: 68.5% of 73 flights. Afternoon was lowest at 55.0% across 240 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning44568.1%18.0%0.4%
Afternoon24055.0%36.2%1.2%
Night7368.5%20.5%2.7%

Which weekday was most reliable for SFO to STL?

Among qualifying SFO-to-STL weekday results, Saturday had the highest on-time rate: 74.7% of 91 flights. Monday was lowest at 56.0% across 116 flights.

DayFlightsOn time30+ minCancelled
Monday11656.0%29.3%0.9%
Tuesday10671.7%19.8%0.0%
Wednesday11361.9%23.9%0.0%
Thursday12060.0%25.8%0.8%
Friday11465.8%20.2%0.0%
Saturday9174.7%15.4%4.4%
Sunday12166.9%27.3%0.8%

Which airline was most reliable for SFO to STL?

Among qualifying SFO-to-STL airline results, United Airlines had the highest on-time rate: 79.9% of 204 flights. Southwest Airlines was lowest at 48.8% across 342 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines34248.8%35.1%0.0%
SkyWest Airlines23575.3%16.6%2.6%
United Airlines20479.9%11.8%0.5%

Which month was most reliable for SFO to STL?

Among qualifying SFO-to-STL month results, January 2026 had the highest on-time rate: 87.0% of 69 flights. May 2026 was lowest at 46.5% across 71 flights.

MonthFlightsOn time30+ minCancelled
July 20258363.9%25.3%1.2%
August 20256277.4%9.7%0.0%
September 20256071.7%16.7%0.0%
October 20256271.0%17.7%0.0%
November 20255752.6%28.1%0.0%
December 20256160.7%24.6%0.0%
January 20266987.0%7.2%4.3%
February 20265969.5%13.6%0.0%
March 20266078.3%10.0%1.7%
April 20267753.2%39.0%2.6%
May 20267146.5%46.5%0.0%
June 20266050.0%36.7%0.0%

What drove SFO to STL delay minutes?

Late aircraft was the largest recorded SFO-to-STL delay category, accounting for 57.3% of 16,592 BTS-attributed delay minutes during July 2025–June 2026.

Airline26.8%
Late aircraft57.3%
National airspace15.7%
Weather0.2%
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.