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Airport Reliability

STL · St. Louis

St. Louis Lambert International Airport

77%
Departures within 15 minutes
15 min
Average departure delay
79%
Arrivals within 15 minutes
1.3%
Departures cancelled

Based on 68,774 departures and 68,774 arrivals. Data through May 2026.

What the data says

Morning-you made the right choice.

Departures from STL departing between 3–6 AM arrived on time 94% of the time, versus 63% between 9 PM–12 AM.

Sunday scaries are real for this one.

Departures from STL arrived on time 83% of the time on Tuesdays. On Sundays: 74%.

When STL gets messy

On-time by departure window
  • 3–6 AM94%(3309 flights)
  • 6–9 AM89%(16075 flights)
  • 9 AM–12 PM84%(12843 flights)
  • 12–3 PM77%(10097 flights)
  • 3–6 PM70%(11103 flights)
  • 6–9 PM69%(11084 flights)
  • 9 PM–12 AM63%(3167 flights)
On-time by weekday
  • Mon76%(10073 flights)
  • Tue83%(9459 flights)
  • Wed83%(9482 flights)
  • Thu79%(10001 flights)
  • Fri79%(10097 flights)
  • Sat78%(8193 flights)
  • Sun74%(10373 flights)
On-time trend by month
78%
May

Jun 74% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%6038
July 202573%6174
August 202581%5893
September 202585%5719
October 202579%6025
November 202580%5554
December 202574%5679
January 202683%4906
February 202685%4785
March 202676%5619
April 202681%5493
May 202678%5793

Airlines departing STL

Busiest routes from STL

Based on 68,774 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.