Best Time to Fly DEN to IAH: On-Time Stats by Hour & Airline
Denver International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.5% of Denver (DEN) to Houston (IAH) flights arrived on time (4,715 scheduled flights). That is 1.8 points above the national average of 77.6%.
Frontier Airlines was the most punctual of the 2 airlines on the route at 80.2%, while United Airlines trailed at 79.3%.
October has been the best month (88% on time) and Friday the weakest day of the week (77%).
0.3% of flights were cancelled, versus 1.8% nationally.
DEN to IAH on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlines | 80.2% | 57 min | 0.2% | 816 |
| United Airlines | 79.3% | 61 min | 0.3% | 3,899 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to IAH
On-time arrival % by scheduled departure hour (local time), 9,302 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.1% | 0.5% | 779 |
| 6am–7am | 88.4% | 0.0% | 173 |
| 7am–8am | 89.2% | 0.2% | 919 |
| 8am–9am | 72.8% | 1.0% | 104 |
| 9am–10am | 83.8% | 0.7% | 418 |
| 10am–11am | 81.7% | 0.0% | 358 |
| 11am–12pm | 80.6% | 0.3% | 754 |
| 12pm–1pm | 81.1% | 0.5% | 219 |
| 1pm–2pm | 72.4% | 0.5% | 734 |
| 2pm–3pm | 74.2% | 0.0% | 31 |
| 3pm–4pm | 74.5% | 0.3% | 777 |
| 4pm–5pm | 70.5% | 0.2% | 436 |
| 5pm–6pm | 71.5% | 0.3% | 993 |
| 6pm–7pm | 70.3% | 1.0% | 384 |
| 7pm–8pm | 71.7% | 0.5% | 877 |
| 8pm–9pm | 75.2% | 0.8% | 991 |
| 9pm–10pm | 76.2% | 0.8% | 351 |
| 11pm–12am | Limited data | 4 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to IAH
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 79.6% | -0.9 pts | 0.6% | 168 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.1% | +1.6 pts | 0.2% | 394 |
| Summer peak (Jun 15 - Aug 15) | 67.3% | -13.2 pts | 0.5% | 1,682 |
| All other days | 80.5% | — | 0.4% | 7,058 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).