Great-circle route DEN ↔ IAH. Faint dots are other airports, for geographic context. Download this map — free to reuse with a link back to this page.
Frequencies below are per direction, from our most recent schedule sample. The two directions are not identical — that is normal on scheduled routes.
| Direction | Frequency | Days | Airlines |
|---|---|---|---|
| DEN → IAH Denver to Houston |
93/wk | Daily | Frontier Airlines, United Airlines |
| IAH → DEN Houston to Denver |
100/wk | Daily | Frontier Airlines, United Airlines |
Where a direction shows “—” we track it as an operating nonstop but hold no schedule sample for it — we would rather show nothing than guess.
In 2025, airlines reported 1,630,212 passengers on 9,128 flights between DEN and IAH — about 4,469 a day — filling 86% of the 1,890,625 seats flown. United Air Lines Inc. carried the most passengers (85%).
Source: US DOT T-100 segment reports — actual airline-reported traffic, scheduled service only, both directions combined. Cargo and charter flights excluded.
2 airlines fly the DEN–IAH nonstop, including Frontier Airlines, United Airlines.
Recent scheduled departures on this route have used the Boeing 737-900, Airbus A320, Boeing 757-300, Airbus A320 NEO and 2 other types.
Aircraft assignments change by season and by time of day.
The distance between Denver International Airport and George Bush Intercontinental Houston Airport is 862 miles, or 1,387 kilometres.
| Great-circle distance | 862 mi |
| Kilometres | 1,387 km |
| Nautical miles | 749 nmi |
Measured airport to airport. The actual track is longer — aircraft follow airways, avoid restricted airspace and route around weather.
Yes. 2 airlines fly the route nonstop, with about 193 departures a week across both directions. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 2h 18m in the air. That is a great-circle estimate from the 862-mile distance, not a scheduled block time — an airline's published time will differ by roughly 15 to 45 minutes depending on routing, winds and taxi.
About 93 a week from Denver to Houston and 100 a week from Houston to Denver, from our most recent schedule sample.
Frontier Airlines, United Airlines.
In 2025, airlines reported 1,630,212 passengers on 9,128 scheduled flights between DEN and IAH — about 4,469 a day — filling 86% of the seats flown. Source: US DOT T-100 segment reports, both directions combined.
Recent scheduled departures have used the Boeing 737-900, Airbus A320, Boeing 757-300, Airbus A320 NEO. Assignments change by season and by time of day.
