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 34 times a week. The timetable below shows the nonstop scheduled at 2h 24m to 2h 42m for the 768 miles.

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

Updated .

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34
Flights a week, 4-week average
2h 24m to 2h 42m
Scheduled flight time
768 mi
Nonstop distance
Free
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St. Louis to Denver flight schedule

Scheduled nonstop departures for STL to DEN starting October 22, 2026, last checked against our schedule feed on October 18, 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 5548United Airlines05:1006:432h 33mEmbraer E175
UA 2459United Airlines09:0010:302h 30mBoeing 737-800
UA 1380United Airlines13:3615:002h 24mAirbus A319
UA 2323United Airlines16:3918:102h 31mAirbus A319
UA 5548United Airlines05:1006:432h 33mEmbraer E175
UA 2459United Airlines09:0010:302h 30mBoeing 737-800
UA 1380United Airlines13:3615:002h 24mAirbus A319
UA 2323United Airlines16:3918:102h 31mAirbus A319
UA 5548United Airlines05:1006:432h 33mEmbraer E175
UA 2459United Airlines09:0010:302h 30mBoeing 737-800
UA 1380United Airlines13:3615:002h 24mAirbus A319
UA 2323United Airlines16:4018:122h 32mAirbus A319
F9 4567Frontier Airlines19:4221:092h 27mAirbus A320neo
UA 5735United Airlines05:1006:522h 42mEmbraer E175
UA 2459United Airlines08:5810:282h 30mBoeing 737-900
UA 1380United Airlines13:3615:002h 24mAirbus A320
UA 663United Airlines16:3918:102h 31mAirbus A320
UA 756United Airlines16:4018:112h 31mAirbus A320
UA 1352United Airlines08:5010:212h 31mBoeing 737-900
UA 2459United Airlines08:5810:282h 30mBoeing 737-900
UA 1380United Airlines13:3615:002h 24mAirbus A320
UA 663United Airlines16:3918:102h 31mAirbus A320
F9 4567Frontier Airlines20:0021:392h 39mAirbus A320neo
UA 1352United Airlines08:5010:212h 31mBoeing 737-900
UA 2459United Airlines08:5810:282h 30mBoeing 737-900
UA 1380United Airlines13:4015:092h 29mBoeing 737-800
UA 663United Airlines16:3918:102h 31mAirbus A320
UA 1352United Airlines08:5010:212h 31mBoeing 737-900
UA 2459United Airlines08:5810:282h 30mBoeing 737-900
UA 1380United Airlines13:4015:092h 29mBoeing 737-800
F9 4567Frontier Airlines16:1817:482h 30mAirbus A320neo
UA 663United Airlines16:3918:102h 31mAirbus A320

Showing all 32 scheduled STL to DEN departures across 7 days with service, starting October 22, 2026. Later dates are 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 hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every STL to DEN date on the interactive map

Aircraft on the St. Louis to Denver nonstop

In the schedule table on this page, United Airlines flies the Boeing 737-900, the Airbus A320, the Airbus A319, the Boeing 737-800, and the Embraer E175, and Frontier Airlines flies the Airbus A320neo. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

The full STL to DEN nonstop schedule

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 the schedule

Who operates each STL to DEN nonstop and how often it runs, from 2LNR's schedule data.

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.

See STL to DEN on the interactive map →

Frequently asked questions about STL to DEN

How long is the flight from St. Louis (STL) to Denver (DEN)?
Scheduled flight times from St. Louis (STL) to Denver (DEN) run from 2h 24m to 2h 42m across the departures in the schedule table on this page. The nonstop covers about 768 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.
Which airlines fly nonstop from STL to DEN?
United Airlines and Frontier Airlines fly STL to DEN nonstop. 2LNR doesn't show award or upgrade space for any of them on STL to DEN, so this page carries the schedule rather than a space claim.
How many flights a week are there from STL to DEN?
About 34 nonstop flights a week run between St. Louis (STL) and Denver (DEN) 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 20:00, local time at St. Louis. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Which flights operate STL to DEN nonstop?
The schedule table on this page lists 9 flight numbers for STL to DEN nonstops, including UA 663, UA 1352, UA 1380, UA 2323, UA 2459, UA 5548, and UA 5735 on United Airlines, and F9 4567 on Frontier Airlines. The table lists each departure by date with its times and aircraft.
Does 2LNR show upgrade or award space on STL to DEN?
Not on this route: 2LNR doesn't show award or upgrade space for any airline flying STL to DEN. 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. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro.

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