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Route Reliability

Denver → Houston

DEN–IAH · 861 miles · Denver International Airport to George Bush Intercontinental Airport

85
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
7 min
Average arrival delay
0.3%
Cancelled
4,632
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Frontier Airlines80%778 flights
  2. 2.United Airlines79%3,854 flights

What the data says

Morning flights do better here.

DEN–IAH flights departing between 3–6 AM arrived on time 96% of the time, versus 73% between 3–6 PM.

Tuesday comes out ahead.

A small edge: 82% on time on Tuesdays against 76% on Fridays.

Not much between Frontier Airlines and United Airlines.

On this route they all land within 79% to 80% on time. Pick on schedule and price.

It basically never cancels.

Out of 4,632 scheduled flights, only 0.3% were cancelled.

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
  • Mon79%(663 flights)
  • Tue82%(643 flights)
  • Wed80%(643 flights)
  • Thu78%(654 flights)
  • Fri76%(669 flights)
  • Sat82%(659 flights)
  • Sun77%(676 flights)
On-time by departure window
  • 3–6 AM96%(379 flights)
  • 6–9 AM89%(621 flights)
  • 9 AM–12 PM81%(772 flights)
  • 12–3 PM73%(398 flights)
  • 3–6 PM73%(1180 flights)
  • 6–9 PM74%(1047 flights)
  • 9 PM–12 AM81%(210 flights)
On-time trend by month
84%
May

Jun 65% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%384
July 202558%398
August 202568%401
September 202582%381
October 202587%397
November 202582%356
December 202583%390
January 202688%383
February 202686%346
March 202679%401
April 202687%359
May 202684%411

Same trip, other airports

Keep nerding

Based on 4,632 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.