Houston to Denver (IAH–DEN) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
IAH–DEN is served by 2 airlines with nonstop service. United Airlines and Frontier lead the route. The flight covers 862 miles in approximately 2h 3m. Beyond nonstop, 184 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| UA United Airlines Also: AC, AV, EK, NZ | 95 | 32Q, 739, 753, A21N, B39M | 2h23-2h53 | Star Alliance | AC, AV, EK, NZ | |
| F9 Frontier Also: Y4 | 26 | 21N, 321, 32N, A21N | 2h26-2h52 | – | Y4 |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Denver from Houston
| Metric | IAH→DEN | HOU→DEN | AUS→DEN |
|---|---|---|---|
| Distance from IAH | – | 24 mi | 140 mi |
| Nonstop airlines | 2 | 3 | 6 |
| Weekly flights | 207 | 43 | 177 |
| Flight time | 2h 3m | 2h 18m | 2h 9m |
| Departure OTP | 69% | – | – |
Travel Essentials
IAH: CDT · DEN: MDT
When it's 6:00 PM in Houston, it's 5:00 PM in Denver.
IAH has no direct rail link to downtown Houston. The IAH Express bus runs from Houston Amtrak/Greyhound station via Park & Ride to Terminal C (60–90 min, $1.25 with METRO Q card). This is the only transit option; Houston's rail network does not reach the airport.Taxis from downtown Houston cost $50–70 and take 40–60 minutes. Ride-hails (Uber, Lyft) are typically $35–55. IAH sits 23 miles north of downtown on the North Freeway (I-45); traffic is heavy during morning and evening rush. Remote economy parking lots serve all terminals via shuttle.
RTD A Line runs to Denver Union Station (37 min, $10.50) with connections to light rail and bus routes. Taxis have meters; expect $55–65 to downtown.DEN's tent-roof Jeppesen Terminal is a single building; all three concourses connect via the underground automated train. Rental cars are on level 5. For ski resorts, shuttle services depart from Ground Transportation.
Semi-arid with 300+ days of sunshine. Summers are dry and warm (27–34°C) with afternoon thunderstorms that produce dramatic but brief delays. Winters bring cold temperatures (−8 to 5°C) and heavy blizzards that can shut down ground operations.
Spring snowstorms can be heavier than midwinter ones. Altitude (5,430 ft) means low humidity year-round; stay hydrated.
IAH–DEN Quick Facts
Frequently Asked Questions
Houston Intercontinental to Denver: United's Hub-to-Hub Energy Corridor
IAH-DEN links two of United Airlines' most important domestic hubs, with United running six to eight daily nonstops and Southwest, Frontier, and Spirit adding additional frequency. Total nonstop capacity runs ten to twelve daily departures. Block time is two hours 15 minutes northbound. The 1,033-mile route is one of the US energy industry's most-traveled corporate air corridors, connecting the global oil and gas headquarters cluster in Houston to Denver's upstream exploration and production sector in the Rocky Mountain region. George Bush Intercontinental (IAH) is United's second-largest hub and handles 50+ million passengers annually from its five-terminal campus. Denver International handles 90+ million and has one of the highest growth rates of any major US airport in the 2020s.
Network Value and Connections
Both IAH and DEN are full United hubs, meaning connections from either airport reach United's complete domestic and international network. IAH's Latin American network is particularly strong: United operates nonstops to Bogota, Lima, Mexico City, Guatemala City, San Jose, and Panama City from Houston, giving Denver-origin passengers connecting at IAH broad Latin American access. DEN's network advantage is Mountain West domestic coverage, reaching Jackson Hole, Aspen, Eagle County, and secondary ski-resort airports that Houston does not serve nonstop. Frontier Airlines bases its operation in Denver and provides low-cost IAH-DEN nonstops with a-la-carte fee structure. Southwest's IAH-DEN service books as a point-to-point route with connections available via Southwest's network but not interlined with United.