Denver to Houston (DEN–IAH) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
DEN–IAH is served by 3 airlines with nonstop service. United Airlines, Frontier and SkyWest Airlines lead the route. The flight covers 862 miles in approximately 1h 53m. Beyond nonstop, 176 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| UA United Airlines Also: AC, AV, EK, NZ | 99 | 32Q, 739, 753, 7M9, A21N, B39M | 2h11-2h38 | Star Alliance | AC, AV, EK, NZ | |
| F9 Frontier Also: Y4 | 21 | 32Q, A21N | 2h14-3h27 | – | Y4 | |
| OO SkyWest Airlines | 0 | – | – | – | – |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Houston from Denver
| Metric | DEN→IAH | COS→IAH | EGE→IAH |
|---|---|---|---|
| Distance from DEN | – | 73 mi | 120 mi |
| Nonstop airlines | 3 | 1 | 2 |
| Weekly flights | 226 | 29 | – |
| Flight time | 1h 53m | 2h 22m | 2h 44m |
| Departure OTP | 91% | – | – |
Travel Essentials
DEN: MDT · IAH: CDT
When it's 6:00 PM in Denver, it's 7:00 PM in Houston.
RTD A Line commuter rail runs from Denver Union Station to the airport (37 min, $10.50). Trains depart every 15 minutes during peak hours. The airport is 25 miles northeast of downtown; ride-shares cost $35–55 and take 30–45 minutes depending on I-70 traffic.Economy parking in lots 4–6 connects via free shuttle. Mountain shuttle services depart from Jeppesen Terminal's Ground Transportation level.
No direct rail from IAH. The METRO bus 102 (IAH Express) runs to downtown Houston's transit center (60–90 min, $1.25). Taxis to downtown Houston cost $50–70. Ride-hails pick up at the designated Rideshare zones outside baggage claim on the lower level.IAH has five terminals (A–E) connected by an underground tunnel with trams. Terminal D handles international arrivals. Rental car agencies are in a consolidated facility adjacent to Terminal C; a free IAH Connector bus runs between terminals and the rental car center. The Galleria / Uptown area costs $35–50 by ride-hail.
Humid subtropical climate. Hot, humid, and wet for much of the year. Summers are brutal (33–38°C) with high humidity and near-daily afternoon thunderstorms. Severe storms with hail and high winds regularly cause ground stops from April through September. Houston's flooding risk is significant. Heavy rain events, including tropical system remnants, have flooded airport roads, cutting off surface access even when the airport itself remains operational.
Winters are mild (5–18°C) with occasional ice storms. These are rare but highly disruptive when they occur. Hurricane season (June–November) requires monitoring for Gulf storms. October through March has the best flying weather.
DEN–IAH Quick Facts
Frequently Asked Questions
Denver to Houston: United Airlines Hub-to-Hub Workhorse
DEN-IAH is a United Airlines monopoly route connecting two of the carrier's largest domestic hubs. United runs 7 to 10 daily nonstops on the 861-mile sector with block times around 2 hours 40 minutes. Equipment ranges from 737 MAX to A320 to occasional 757 widebody-substitute configurations during peak periods. The route exists primarily as a connection bridge. Denver feeds United's mountain West, Pacific, and transcon traffic into Houston's Latin American and Gulf Coast network. A passenger originating in Boise can connect through Denver and Houston to reach Bogota or Cancun on a single United itinerary.
Energy Sector Traffic and Alternatives
Denver and Houston share a significant economic link through the energy sector. Denver hosts regional offices for oil, gas, and renewable energy companies headquartered in Houston. This generates consistent weekday business demand independent of the connecting traffic. Southwest Airlines competes on the Denver-Houston market via DEN-HOU (Hobby Airport), which is closer to downtown Houston and the Galleria area. Passengers whose destination is south or central Houston often prefer Hobby. IAH serves the north Houston suburbs, the Woodlands, and passengers connecting to United's international network. Denver International is 25 miles from downtown Denver, connected by the RTD A Line commuter rail in 37 minutes.