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Route Reliability

Houston → Denver

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

88
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
4 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 Airlines82%778 flights
  2. 2.United Airlines82%3,854 flights

What the data says

Morning flights do better here.

IAH–DEN flights departing between 3–6 AM arrived on time 96% of the time, versus 68% between 3–6 PM.

Tuesday comes out ahead.

A small edge: 85% on time on Tuesdays against 80% on Mondays.

Not much between Frontier Airlines and United Airlines.

On this route they all land within 82% to 82% 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
  • Mon80%(667 flights)
  • Tue85%(642 flights)
  • Wed83%(643 flights)
  • Thu81%(655 flights)
  • Fri81%(666 flights)
  • Sat81%(659 flights)
  • Sun81%(675 flights)
On-time by departure window
  • 3–6 AM96%(194 flights)
  • 6–9 AM90%(1102 flights)
  • 9 AM–12 PM87%(844 flights)
  • 12–3 PM81%(715 flights)
  • 3–6 PM68%(457 flights)
  • 6–9 PM69%(765 flights)
  • 9 PM–12 AM81%(530 flights)
On-time trend by month
84%
May

Jun 71% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%384
July 202573%396
August 202574%400
September 202583%382
October 202583%395
November 202584%357
December 202585%390
January 202688%384
February 202687%347
March 202683%399
April 202688%361
May 202684%412

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.