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

Salt Lake City, UT (SLC) to St. Louis, MO (STL) flight delay odds

83.2% of 989 official scheduled SLC-to-STL flights arrived on time; 11.0% arrived at least 30 minutes late and 0.5% 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 SIGNALLower disruption
83.2%arrived on time
11.0%30+ min late
0.5%cancelled
989scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.7%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+0.1 mincompleted flights

Which departure time was most reliable for SLC to STL?

Among qualifying SLC-to-STL departure window results, Late morning had the highest on-time rate: 88.9% of 370 flights. Evening was lowest at 77.7% across 358 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning37088.9%6.5%0.3%
Afternoon25582.4%11.8%1.2%
Evening35877.7%15.4%0.3%

Which weekday was most reliable for SLC to STL?

Among qualifying SLC-to-STL weekday results, Wednesday had the highest on-time rate: 89.6% of 144 flights. Sunday was lowest at 73.8% across 145 flights.

DayFlightsOn time30+ minCancelled
Monday14885.1%11.5%0.0%
Tuesday14788.4%8.8%0.0%
Wednesday14489.6%6.9%0.0%
Thursday14681.5%13.7%0.7%
Friday14582.1%7.6%0.0%
Saturday11481.6%12.3%0.9%
Sunday14573.8%16.6%2.1%

Which airline was most reliable for SLC to STL?

Only Delta Air Lines met the SLC-to-STL airline threshold: 83.1% of 978 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines97883.1%11.0%0.5%
Southwest Airlines988.9%11.1%0.0%
SkyWest Airlines2100.0%0.0%0.0%

Which month was most reliable for SLC to STL?

Among qualifying SLC-to-STL month results, March 2026 had the highest on-time rate: 93.1% of 87 flights. September 2025 was lowest at 76.8% across 82 flights.

MonthFlightsOn time30+ minCancelled
July 20259280.4%10.9%0.0%
August 20258880.7%12.5%0.0%
September 20258276.8%13.4%1.2%
October 20258887.5%8.0%0.0%
November 20258383.1%16.9%0.0%
December 20257978.5%16.5%1.3%
January 20266285.5%8.1%1.6%
February 20266580.0%15.4%0.0%
March 20268793.1%3.4%1.1%
April 20268683.7%10.5%0.0%
May 20268787.4%8.0%1.1%
June 20269081.1%10.0%0.0%

What drove SLC to STL delay minutes?

Airline was the largest recorded SLC-to-STL delay category, accounting for 64.5% of 9,961 BTS-attributed delay minutes during July 2025–June 2026.

Airline64.5%
Late aircraft26.0%
National airspace8.1%
Weather1.4%
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.