How long does the flight from St. Louis to Denver take?

Flight time from St. Louis (STL) to Denver (DEN) depends on routing, aircraft type, and whether the flight is direct or connecting. A direct flight typically reflects great-circle distance plus winds, while one-stop options can add several hours depending on the layover airport. Check the exact duration in the search results above, where we show block time per itinerary along with stop count.

Which airlines fly from St. Louis to Denver?

Airline availability for STL to DEN changes by season and sometimes week to week as carriers adjust capacity. Our search above pulls live schedules and returns the airlines currently selling this route, both direct and connecting. Codeshare and interline itineraries are included, so you may see results operated by one carrier but sold by another.

Are there direct flights from St. Louis to Denver?

Direct (nonstop) availability on STL to DEN varies by date, day of week, and season. Busy city pairs usually have multiple daily nonstops, while thinner routes may only have direct service a few days per week or only during peak seasons. Use our search above with flexible dates to see which days actually have nonstop options.

What is the cheapest month to fly from St. Louis to Denver?

Prices on STL to DEN shift with seasonality, school holidays, and major events at both ends. Our 12-month price calendar below the search results shows the lowest fare found per departure date, which makes it easy to spot the cheapest weeks at a glance. Flexibility of a few days around your target date often unlocks significantly lower fares.

St. Louis to Denver flights

Direct and connecting flights from St. Louis (STL) to Denver (DEN). Compare airlines, aircraft, and fares.

Distance: 1,236 km (768 mi)
Flight time: ~1h 47m
Airlines: 2
Aircraft types: 2

Airlines flying STL → DEN

Airline	Aircraft types	Observations
Southwest Airlines	1	1
SkyWest	1	1

Aircraft on this route

Boeing 737 — 1 operator
Embraer E170/E175 — 1 operator

Airport details

Departure: St Louis Lambert International Airport (STL)

City: St. Louis
Country: United States
IATA / ICAO: STL / KSTL

Arrival: Denver International Airport (DEN)

City: Denver
Country: United States
IATA / ICAO: DEN / KDEN

Operating airlines

Frontier Airlines (F9)
United Airlines (UA)
Southwest Airlines (WN)

Distance: 1237 km. Duration: 140 minutes.

Other routes from St. Louis

Other routes to Denver

Frequently asked questions

How many airlines fly STL to DEN?

2 airlines operate the STL to DEN route in our 90-day observed dataset.

What aircraft fly the STL-DEN route?

The most commonly observed aircraft on STL to DEN include: Boeing 737, Embraer E170/E175.

How long is the St. Louis to Denver flight?

The estimated flight time from St. Louis (STL) to Denver (DEN) is approximately 1h 47m, based on a cruise speed of 850 km/h.

What's the distance from St. Louis to Denver?

The great-circle distance from St. Louis (STL) to Denver (DEN) is approximately 1,236 km (768 miles).

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