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

St. Louis, MO (STL) to Phoenix, AZ (PHX) flight delay odds

74.9% of 2,284 official scheduled STL-to-PHX flights arrived on time; 15.2% 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 SIGNALGenerally reliable
74.9%arrived on time
15.2%30+ min late
0.5%cancelled
2,284scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.1%all scheduled flights
120+ minutes late3.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+12.0 mincompleted flights

Which departure time was most reliable for STL to PHX?

Among qualifying STL-to-PHX departure window results, Early morning had the highest on-time rate: 89.3% of 769 flights. Night was lowest at 50.0% across 180 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning76989.3%6.8%0.7%
Late morning22982.5%7.9%0.4%
Afternoon59175.0%15.1%0.3%
Evening51558.4%25.0%0.4%
Night18050.0%33.3%0.6%

Which weekday was most reliable for STL to PHX?

Among qualifying STL-to-PHX weekday results, Tuesday had the highest on-time rate: 79.2% of 322 flights. Sunday was lowest at 69.3% across 352 flights.

DayFlightsOn time30+ minCancelled
Monday35771.4%19.3%1.1%
Tuesday32279.2%13.0%0.3%
Wednesday31578.7%11.4%0.3%
Thursday33473.1%16.5%0.0%
Friday35077.7%12.3%0.6%
Saturday25475.6%14.6%0.4%
Sunday35269.3%18.8%0.6%

Which airline was most reliable for STL to PHX?

Among qualifying STL-to-PHX airline results, Envoy Air had the highest on-time rate: 100.0% of 30 flights. Southwest Airlines was lowest at 71.9% across 1,600 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,60071.9%15.9%0.3%
American Airlines54880.8%14.4%0.9%
Frontier Airlines5381.1%15.1%1.9%
SkyWest Airlines5383.0%11.3%0.0%
Envoy Air30100.0%0.0%0.0%

Which month was most reliable for STL to PHX?

Among qualifying STL-to-PHX month results, January 2026 had the highest on-time rate: 82.4% of 199 flights. June 2026 was lowest at 57.2% across 166 flights.

MonthFlightsOn time30+ minCancelled
July 202516676.5%15.7%0.0%
August 202516574.5%14.5%0.0%
September 202516075.6%13.1%1.2%
October 202520074.5%14.5%0.0%
November 202518770.1%20.3%0.5%
December 202520670.9%19.9%0.0%
January 202619982.4%10.1%2.5%
February 202619381.9%10.4%0.0%
March 202623378.5%13.3%0.4%
April 202620779.7%10.6%0.0%
May 202620273.3%16.8%0.5%
June 202616657.2%25.3%0.6%

What drove STL to PHX delay minutes?

Late aircraft was the largest recorded STL-to-PHX delay category, accounting for 43.7% of 42,469 BTS-attributed delay minutes during July 2025–June 2026.

Airline42.0%
Late aircraft43.7%
National airspace9.8%
Weather4.3%
Security0.2%
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.