St. Louis (STL) to Denver (DEN) is about 770 miles and typically takes 2 h 05 min by air. Airlines with hubs at both ends are the likeliest to offer nonstops; otherwise expect a connection. Call (800) 490-3234 for live fares.
STL to DEN at a glance
| Route | St. Louis (STL) to Denver (DEN) |
|---|---|
| Distance | about 770 miles / 1,240 km |
| Typical flight time | 2 h 05 min (estimate) |
| Time difference | 1 hours behind |
| Route type | Domestic (U.S.) |
| Airlines with hubs here | United Airlines and Southwest Airlines |
About the St. Louis to Denver route
With roughly 770 miles between STL and DEN, this route sits in the middle range where both nonstop and one-stop options can be competitive.
Flight time and distance
A typical flight takes about 2 h 05 min gate to gate, with a realistic range of 1 h 45 min to 2 h 30 min depending on wind, routing and aircraft. That is an estimate based on the distance of roughly 770 miles (1,240 km), not a published schedule.
Denver is 1 hour behind St. Louis on standard time, so the arrival time on your ticket will look different from the flight duration.
Among the 200 routes in our guides, STL to DEN is longer than about 22% of them.
For comparison, St. Louis to Orlando (STL to MCO) is about 880 miles, so Denver is a bit closer away from STL.
The airports
St. Louis Lambert International Airport (STL)
St. Full STL guide.
Denver International Airport (DEN)
Denver is a United hub and one of Southwest's busiest airports, which gives travelers a wide choice of nonstops across the West and Midwest. Full DEN guide.
Nearby alternatives: around Denver, Colorado Springs. Price all of them before you commit, especially if you have flexible dates.
Airlines on this route
No single carrier we cover has hubs at both STL and DEN. United Airlines (at DEN) and Southwest Airlines (at DEN) each operate a large network at one end, so many itineraries on this route connect rather than fly nonstop.
Nonstop availability on any route can shift from one season to the next, so treat this as a guide to who is likely to serve the market, not a timetable.
Common connection points
If you choose a one-stop itinerary, likely routings include United Airlines via Chicago (ORD), which adds about 380 miles (49% beyond the direct distance) or Southwest Airlines via Chicago (MDW), which adds about 380 miles (49% beyond the direct distance). Choose the connection with the best weather odds for your travel month and leave a comfortable layover; our layover guide explains how much time is realistic.
Best time to fly
For this trip, keep in mind that at DEN, ski season brings holiday peaks, and spring snowstorms can cause sudden cancellations. At STL, cardinals home games and summer travel are the busier periods.
Ground transport
Getting to and from STL
MetroLink light rail reaches downtown in about 35 minutes.
Getting to and from DEN
The A Line train reaches Union Station in about 37 minutes.
Booking tips
If you are flying to Denver for a vacation, compare the fare with bags included, since leisure travelers often check luggage. Our fare-type guide shows what low fares leave out.
Frequently asked questions
How long is the flight from St. Louis to Denver?
A typical STL to DEN flight takes about 2 h 05 min, with a likely range of 1 h 45 min to 2 h 30 min. Actual time depends on wind, routing, aircraft and whether you connect.
How far is Denver from St. Louis by air?
The great-circle distance between STL and DEN is about 770 miles (1,240 km).
Which airlines fly from St. Louis to Denver?
United Airlines and Southwest Airlines have a major presence at STL or DEN, and service varies by season. Ask us to check current nonstop and connecting options.
What is the time difference between St. Louis and Denver?
Denver is 1 hour behind St. Louis on standard time. Daylight saving time can change the gap for part of the year.
Are there other airports near Denver?
Yes. Nearby alternatives include Colorado Springs. Comparing them can change both fare and travel time.
When is the best time to book STL to DEN?
For leisure routes like this, book early for school holidays and peak seasons. Domestic fares are often competitive one to three months ahead, while international trips benefit from more lead time. Compare several dates, since fares are priced flight by flight.
Explore related routes
More flights involving St. Louis (STL)
More flights involving Denver (DEN)
- Atlanta to DenverATL to DEN
- Austin to DenverAUS to DEN
- Baltimore to DenverBWI to DEN
- Chicago to DenverMDW to DEN
- Chicago to DenverORD to DEN
- Cleveland to DenverCLE to DEN
Last reviewed October 22, 2026. FlighTicketHub provides general information; confirm details with the airline before you travel.