St. Louis to Denver (STL-DEN): nonstop flights and who flies them

United Airlines and Frontier Airlines fly nonstop between St. Louis (STL) and Denver (DEN), roughly 55 times a week. With United Airlines running most of the schedule, the shape of a week is predictable, which makes an open premium seat on a given date easy to spot and quick to lose. United Airlines and Frontier Airlines fly the route nonstop in 2LNR's schedule data; the timetable and the reverse direction are below.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

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55
Nonstop flights a week
768 mi
Nonstop distance
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St. Louis to Denver flight schedule

Scheduled nonstop departures for STL to DEN, last checked against our schedule feed on September 6, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from St. Louis (STL) to Denver (DEN)
Date Flight Airline Departs STL Arrives DEN Duration Aircraft
UA 362United Airlines05:1006:322h 22m738
UA 2459United Airlines09:0010:312h 31m738
UA 1380United Airlines13:3615:002h 24m320
UA 1161United Airlines16:4018:102h 30m738
UA 1548United Airlines16:4018:102h 30m738
UA 333United Airlines16:4018:102h 30m738
UA 1483United Airlines16:4818:232h 35m738
F9 4567Frontier Airlines20:1021:392h 29m320
UA 5552United Airlines05:1006:432h 33mE7W
UA 2459United Airlines09:0010:312h 31m738
UA 1380United Airlines13:3615:002h 24m320
UA 1161United Airlines16:4018:102h 30m738
UA 1548United Airlines16:4018:102h 30m738
UA 333United Airlines16:4018:102h 30m738
UA 1483United Airlines16:4818:232h 35m738
F9 4567Frontier Airlines20:1021:492h 39m32N
UA 362United Airlines05:1006:322h 22m738
UA 2459United Airlines09:0010:312h 31m738
UA 1380United Airlines13:3615:002h 24m320
UA 1161United Airlines16:4018:102h 30m738
UA 1548United Airlines16:4018:102h 30m738
UA 333United Airlines16:4018:102h 30m738
UA 1483United Airlines16:4818:232h 35m738
F9 4567Frontier Airlines20:1021:392h 29m32N
UA 5552United Airlines05:1006:432h 33mE7W
UA 2459United Airlines09:0010:312h 31m738
UA 1380United Airlines13:3615:002h 24m320
UA 1161United Airlines16:4018:102h 30m738
UA 333United Airlines16:4018:102h 30m738
UA 1548United Airlines16:4518:152h 30m738
F9 4567Frontier Airlines20:1021:392h 29m32N
UA 5552United Airlines05:1006:432h 33mE7W
UA 2459United Airlines09:0010:312h 31m738
F9 3301Frontier Airlines13:0214:262h 24m32N
UA 1380United Airlines13:3615:002h 24m320
UA 1161United Airlines16:4018:102h 30m738
UA 1548United Airlines16:4018:102h 30m738
UA 333United Airlines16:4018:102h 30m738
UA 1483United Airlines16:4818:232h 35m738
UA 2212United Airlines18:5520:222h 27m319

Showing the first 40 of 58 scheduled STL to DEN departures across the next 7 days with service. Every remaining date is on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline has not filed that value in the schedule data we hold. Aircraft are IATA equipment codes as filed, and can change up to departure.

See every STL to DEN date on the interactive map

The full STL to DEN nonstop schedule

United Airlines and Frontier Airlines fly the route nonstop in 2LNR's schedule data. This page carries the full STL to DEN nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below.

See real availability

Confirmed upgrade and award seats on each STL to DEN departure, checked against live inventory so you know what is open before you book.

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Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See STL to DEN on the interactive route map, with schedules, connections, and route statistics.

Airlines flying St. Louis to Denver nonstop

Carriers operating STL to DEN nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

See STL to DEN on the interactive map →

Frequently asked questions about STL to DEN

How far is Denver from St. Louis?
STL to DEN covers about 768 miles nonstop. Flight times vary by aircraft and season; the schedule table on this page lists each scheduled departure with its own times.
Which airlines fly nonstop from STL to DEN?
United Airlines and Frontier Airlines fly the route nonstop. None of them is a carrier 2LNR reads inventory for, so this page carries the STL to DEN schedule rather than a space claim.
How many flights a week are there from STL to DEN?
About 55 nonstop flights a week run between St. Louis and Denver in the current schedule, operated by United Airlines and Frontier Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from STL to DEN depart?
Scheduled STL to DEN nonstops in the next 7 days with service leave between 05:10 and 20:10, local time at St. Louis. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Does 2LNR show upgrade or award space on STL to DEN?
Not on this route: none of United Airlines and Frontier Airlines is a carrier 2LNR reads inventory for. The page carries the full STL to DEN nonstop schedule and who flies each departure, and the reverse direction is linked below.

See the full STL to DEN nonstop schedule

Every scheduled departure on this route, with who flies it. On the routes 2LNR does read inventory for, upgrade and award space shows by date, the next 14 days free on every product and the full horizon on Pro.

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