DEN to IAH flight delays
Denver, CO (DEN) Houston, TX (IAH) · 861 miles
431 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
68.6%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
59 min
When late, late by
Average across delayed arrivals
20 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Flights from Denver to Houston run late more often than the average route, though not severely.
Only United Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 431 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on DEN to IAH.
Every airline on DEN to IAH
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| United Airlines | 351 | 68% | 0% | 60 min | D |
| Frontier Airlines | 80 | 71.25% | 0% | 57 min | — |
The return leg
IAH to DEN Houston back to Denver 71.66% on time COther routes from Denver
Common questions
Are flights from Denver to Houston usually delayed?
68.6% of flights on the DEN to IAH route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Denver to Houston?
Only United Airlines appears in the published record on this route, with 351 flights and 68% arriving on time.
How often are DEN to IAH flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When DEN to IAH flights are late, how late are they?
About 59 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on DEN to IAH during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →