St Louis to Denver (STL–DEN) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
STL–DEN is served by 4 airlines with nonstop service. Southwest Airlines, United Airlines and Air Canada lead the route. The flight covers 768 miles in approximately 2h 20m. Beyond nonstop, 94 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| WN Southwest Airlines | 88 | 737, 738, 73H, 7M8, 7S7, B38M | 2h20-3h19 | – | – | |
| UA United Airlines | 47 | 319, 320, 739, E75L, E7W | 2h34-3h23 | Star Alliance | – | |
| AC Air Canada | 7 | E7W | 2h40 | Star Alliance | – | |
| F9 Frontier | 7 | 32Q | 3h14 | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Other ways to reach Denver from St Louis
| Metric | STL→DEN | COU→DEN | PIA→DEN |
|---|---|---|---|
| Distance from STL | – | 100 mi | 137 mi |
| Nonstop airlines | 4 | 1 | 1 |
| Weekly flights | 149 | 7 | 7 |
| Flight time | 2h 20m | 2h 25m | 2h 5m |
| Departure OTP | 100% | – | – |
Travel Essentials
STL: EDT · DEN: MDT
When it's 6:00 PM in St Louis, it's 4:00 PM in Denver.
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.
STL–DEN Quick Facts
Frequently Asked Questions
Flights from STL to DEN
St. Louis Lambert International Airport (STL) and Denver International Airport (DEN) are connected by nonstop service from Air Canada, Frontier, United Airlines and Southwest Airlines. With 149 weekly departures, this is a heavily served route.
STL to DEN Flight Duration and Schedule
Nonstop flight time from STL to DEN ranges from 2 hours 20 minutes to 3 hours 23 minutes. The route covers a distance of 768 miles (1,236 km). There are approximately 149 weekly flights outbound and 121 return, totaling 270 flights per week in both directions.
Connecting Options and Alternatives
94 one-stop connections are available, with the fastest taking approximately 4 hours via COU. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Columbia (COU) and Peoria (PIA).