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Route Reliability

Houston → St. Louis

IAH–STL · 667 miles · George Bush Intercontinental Airport to St. Louis Lambert International Airport

83
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
5 min
Average arrival delay
1.1%
Cancelled
1,213
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 81% of the time across 1,213 flights. No comparison to make.

What the data says

Morning flights do better here.

IAH–STL flights departing between 6–9 AM arrived on time 89% of the time, versus 74% between 6–9 PM.

Sunday scaries are real for this one.

IAH–STL flights arrived on time 87% of the time on Wednesdays. On Sundays: 77%.

Slipping a little lately.

IAH–STL flights arrived on time 83% of the time over the last three months in the data, compared with 87% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon80%(167 flights)
  • Tue81%(167 flights)
  • Wed87%(178 flights)
  • Thu78%(185 flights)
  • Fri80%(183 flights)
  • Sat84%(133 flights)
  • Sun77%(183 flights)
On-time by departure window
  • 6–9 AM89%(341 flights)
  • 12–3 PM83%(346 flights)
  • 3–6 PM74%(143 flights)
  • 6–9 PM74%(366 flights)
On-time trend by month
85%
May

Jun 59% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%107
July 202578%105
August 202575%110
September 202589%113
October 202583%110
November 202580%111
December 202584%90
January 202687%84
February 202690%82
March 202677%91
April 202688%89
May 202685%104

Same trip, other airports

Keep nerding

Based on 1,213 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.