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

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

Historically, 74.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 2,284 flights.

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

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 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%

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
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%

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 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%

Monthly trend

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

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 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.

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.