DEN to IAH flight delays & on-time performance
Nonstop flights from Denver International Airport to George Bush Intercontinental Airport · 861 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at DEN or IAH right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Denver (DEN) to Houston (IAH) arrived on time 79% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.3% were cancelled, and 7% arrived an hour or more late.
- Frontier Airlines was the most punctual airline here (80% on time); United Airlines was the least (79%).
- Departures scheduled around 5am did best (96% on time); around 1pm did worst (70%).
- Tuesday was the most reliable day to fly (84% on time) and Friday the least (77%).
- The largest source of delay minutes was late-arriving aircraft (41%).
Which airline is most on time from DEN to IAH?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Frontier Airlines | 80% | 0.2% | 12 min | 6.6% | 816 |
| United Airlines | 79% | 0.3% | 14 min | 6.7% | 3,899 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%382 flights
- 6am92%74 flights
- 7am89%543 flights
- 9am83%149 flights
- 10am82%242 flights
- 11am80%388 flights
- 1pm70%365 flights
- 3pm76%392 flights
- 4pm77%351 flights
- 5pm73%451 flights
- 6pm73%181 flights
- 7pm75%434 flights
- 8pm77%411 flights
- 9pm75%315 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%0.6% cancelled
- Tuesday84%0.6% cancelled
- Wednesday78%0.0% cancelled
- Thursday80%0.3% cancelled
- Friday77%0.1% cancelled
- Saturday81%0.0% cancelled
- Sunday78%0.3% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft41%
- Air traffic control & airport congestion30%
- Airline (crew, maintenance, cleaning, fueling)27%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)54%
- Extreme weather46%
- Air traffic control & airport congestion0%
- Security0%
DEN to IAH: common questions
- How often are DEN to IAH flights on time?
- 79% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Denver to Houston cancelled?
- 0.3% of scheduled flights were cancelled (13 of 4,715).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 60 min behind schedule on average, and 6.7% of flights were an hour or more late.
- How long is taxi time at DEN?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to DEN — 82% on time
More flights from Denver
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: DEN → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.