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Route Reliability

St. Louis → Houston

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

86
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
1 min
Average arrival delay
1.2%
Cancelled
1,215
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 83% of the time across 1,215 flights. No comparison to make.

What the data says

Morning flights do better here.

STL–IAH flights departing between 6–9 AM arrived on time 85% of the time, versus 71% between 6–9 PM.

Friday is doing you no favors.

STL–IAH flights arrived on time 88% of the time on Tuesdays. On Fridays: 80%.

Slipping a little lately.

STL–IAH flights arrived on time 80% of the time over the last three months in the data, compared with 85% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon82%(182 flights)
  • Tue88%(165 flights)
  • Wed85%(168 flights)
  • Thu85%(182 flights)
  • Fri80%(184 flights)
  • Sat81%(152 flights)
  • Sun82%(165 flights)
On-time by departure window
  • 6–9 AM85%(512 flights)
  • 9 AM–12 PM85%(344 flights)
  • 12–3 PM—(8 flights)
  • 3–6 PM81%(283 flights)
  • 6–9 PM71%(51 flights)
On-time trend by month
75%
May

Jun 73% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%106
July 202579%105
August 202586%110
September 202594%114
October 202584%109
November 202588%111
December 202581%91
January 202681%84
February 202693%81
March 202681%91
April 202683%90
May 202675%106

Same trip, other airports

Keep nerding

Based on 1,215 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.