--- title: "St. Louis (STL) to Denver (DEN) flights: who flies it" description: "United Airlines and Frontier Airlines fly nonstop from STL to DEN, about 34 flights a week, covering 768 miles. See the full timetable and who flies it on 2LNR." canonical: "https://2lnr.com/routes/stl-den" url: "https://2lnr.com/routes/stl-den.md" date_modified: "2026-10-18T05:10:47Z" --- # 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 October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 23, 2026. See STL to DEN on the interactive map [Get started free](https://2lnr.com/login) 34 Flights a week, 4-week average 2h 24m to 2h 42m Scheduled flight time 768 mi Nonstop distance Free To get started ## 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. Scheduled nonstop departures from St. Louis (STL) to Denver (DEN) | Date | Flight | Airline | Departs STL | Arrives DEN | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Thu, Oct 22 | UA 5548 | United Airlines | 05:10 | 06:43 | 2h 33m | [Embraer E175](https://2lnr.com/seatmaps/ua/e175.md) | | Thu, Oct 22 | UA 2459 | United Airlines | 09:00 | 10:30 | 2h 30m | [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md) | | Thu, Oct 22 | UA 1380 | United Airlines | 13:36 | 15:00 | 2h 24m | [Airbus A319](https://2lnr.com/seatmaps/ua/a319.md) | | Thu, Oct 22 | UA 2323 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus A319 | | Fri, Oct 23 | UA 5548 | United Airlines | 05:10 | 06:43 | 2h 33m | Embraer E175 | | Fri, Oct 23 | UA 2459 | United Airlines | 09:00 | 10:30 | 2h 30m | Boeing 737-800 | | Fri, Oct 23 | UA 1380 | United Airlines | 13:36 | 15:00 | 2h 24m | Airbus A319 | | Fri, Oct 23 | UA 2323 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus A319 | | Sat, Oct 24 | UA 5548 | United Airlines | 05:10 | 06:43 | 2h 33m | Embraer E175 | | Sat, Oct 24 | UA 2459 | United Airlines | 09:00 | 10:30 | 2h 30m | Boeing 737-800 | | Sat, Oct 24 | UA 1380 | United Airlines | 13:36 | 15:00 | 2h 24m | Airbus A319 | | Sat, Oct 24 | UA 2323 | United Airlines | 16:40 | 18:12 | 2h 32m | Airbus A319 | | Sat, Oct 24 | F9 4567 | Frontier Airlines | 19:42 | 21:09 | 2h 27m | [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md) | | Sun, Oct 25 | UA 5735 | United Airlines | 05:10 | 06:52 | 2h 42m | Embraer E175 | | Sun, Oct 25 | UA 2459 | United Airlines | 08:58 | 10:28 | 2h 30m | [Boeing 737-900](https://2lnr.com/seatmaps/ua/737-900.md) | | Sun, Oct 25 | UA 1380 | United Airlines | 13:36 | 15:00 | 2h 24m | [Airbus A320](https://2lnr.com/seatmaps/ua/a320.md) | | Sun, Oct 25 | UA 663 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus A320 | | Sun, Oct 25 | UA 756 | United Airlines | 16:40 | 18:11 | 2h 31m | Airbus A320 | | Mon, Oct 26 | UA 1352 | United Airlines | 08:50 | 10:21 | 2h 31m | Boeing 737-900 | | Mon, Oct 26 | UA 2459 | United Airlines | 08:58 | 10:28 | 2h 30m | Boeing 737-900 | | Mon, Oct 26 | UA 1380 | United Airlines | 13:36 | 15:00 | 2h 24m | Airbus A320 | | Mon, Oct 26 | UA 663 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus A320 | | Mon, Oct 26 | F9 4567 | Frontier Airlines | 20:00 | 21:39 | 2h 39m | Airbus A320neo | | Tue, Oct 27 | UA 1352 | United Airlines | 08:50 | 10:21 | 2h 31m | Boeing 737-900 | | Tue, Oct 27 | UA 2459 | United Airlines | 08:58 | 10:28 | 2h 30m | Boeing 737-900 | | Tue, Oct 27 | UA 1380 | United Airlines | 13:40 | 15:09 | 2h 29m | Boeing 737-800 | | Tue, Oct 27 | UA 663 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus A320 | | Wed, Oct 28 | UA 1352 | United Airlines | 08:50 | 10:21 | 2h 31m | Boeing 737-900 | | Wed, Oct 28 | UA 2459 | United Airlines | 08:58 | 10:28 | 2h 30m | Boeing 737-900 | | Wed, Oct 28 | UA 1380 | United Airlines | 13:40 | 15:09 | 2h 29m | Boeing 737-800 | | Wed, Oct 28 | F9 4567 | Frontier Airlines | 16:18 | 17:48 | 2h 30m | Airbus A320neo | | Wed, Oct 28 | UA 663 | United Airlines | 16:39 | 18:10 | 2h 31m | Airbus 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](https://2lnr.com/seatmaps/ua/737-900.md), the [Airbus A320](https://2lnr.com/seatmaps/ua/a320.md), the [Airbus A319](https://2lnr.com/seatmaps/ua/a319.md), the [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md), and the [Embraer E175](https://2lnr.com/seatmaps/ua/e175.md), and Frontier Airlines flies the [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md). 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. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [Frontier Airlines (F9) route map](https://2lnr.com/routes/airlines/f9.md)\ [The aircraft F9 flies](https://2lnr.com/seatmaps/f9.md) 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. Flying the other way? See [DEN to STL nonstop flights](https://2lnr.com/routes/den-stl.md). Award seats rather than schedules? See [award availability by airline](https://2lnr.com/awards.md). Looking beyond this route? See [every route from St. Louis (STL)](https://2lnr.com/routes/stl.md), or [every route from Denver (DEN)](https://2lnr.com/routes/den.md). Nonstops to Denver (DEN) from other airports within 150 miles of St. Louis (STL): - [Columbia (COU) to Denver (DEN)](https://2lnr.com/routes/cou-den.md), 100 miles from STL - [Peoria (PIA) to Denver (DEN)](https://2lnr.com/routes/pia-den.md), 138 miles from STL Distances are great-circle between the airports, not driving distance. - [How to plan an upgrade by route](https://2lnr.com/guides/upgrade-strategy.md) ## 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. [Get started free](https://2lnr.com/login)