STL → DENSt Louis to Denver

live

Direct flights from St Louis (STL) to Denver (DEN): 19 nonstop departures observed each week across 3 airlines. 81% of the last 21 operated flights arrived within 15 minutes of schedule. The median arrival is 4 minutes early. No cancellations were recorded across the 21 tracked flights. The nonstop covers 1,236 km, an estimated 2 hours 5 minutes in the air. Measured by Pro Flight Search from live flight boards at St Louis and Denver. Updated 10 September 2026 at 04:37 UTC.

STL St Louis smooth · +5
DEN Denver smooth · +0
1,236 km · ~2h 05m est.
dep bank 05:10–20:4519x weekly
Runs reliable · 3 airlines · 19x weekly · nonstop
81% on time

of the last 21 operated STL → DEN flights arrived within 15 minutes

Median arrival delay is −4 min. 0 of 21 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−4 minacross the last 21 operated legs
Flight time~2h 05mestimated from route distance
Weekly departures19x3 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 21

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Frontier AirlinesSouthwest AirlinesUnited Airlines

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Frontier AirlinesF9

Flights F94567 19:58 Mo We Th Fr Su

Southwest AirlinesWN86% on time

Flights WN3826 varies daily · WN3827 varies daily · WN125 12:20 Tu We · WN3828 12:45 Mo Th Fr

United AirlinesUA67% on time

Flights UA5468 05:10 Th Sa Su · UA2459 09:00 daily · UA1380 13:36 daily · UA1548 varies Tu We

History

operated legs · board outcomes
09-09F94567dep −1 → arr−23
09-09UA1380dep +11 → arr−11
09-09UA1548dep +119 → arr+96
09-09UA2459arrived−13
09-09WN125arrived−14
09-09WN2704arrived−4
09-09WN3826arrived+3
09-09WN3827arrived−3
09-09WN3831dep +15 → arr+6
09-09WN3832dep −1 → arr−19
09-09WN985dep +11 → arr+1
09-08UA1380arrived−17
09-08UA1548arrived+19
09-08UA2459arrived−14
09-08WN125arrived−4
09-08WN2704arrived+24
09-08WN3826arrived−13
09-08WN3827arrived+3
09-08WN3831arrived+15
09-08WN3832arrived−15
09-08WN985arrived+86

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
STLSt Louis +5 min smooth 🌤 mostly cloudy · ENE 6 kt Full STL delay board →
DENDenver +0 min smooth 🌤 few clouds · SE 6 kt Full DEN delay board →

Weather lens

Current conditions put the pressure at STL and DEN: 44% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the St Louis to Denver route actually runs

Pro Flight Search records official board updates for nonstop STL to DEN flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — St Louis (STL) to Denver (DEN) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/STL-DEN
How we measure this →

STL to DEN questions

Is STL–DEN running on time right now?

Smooth skies ahead. The departure side at STL is the weaker end, route health score 95/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on STL–DEN?

Operators schedule morning departures around 05:10 and evening departures around 17:20 from STL. Earlier flights typically land before destination-airport delays accumulate later in the day; check the DEN delay card to confirm conditions when you'd arrive.

How long is the flight from STL to DEN?

Great-circle distance is 1,236 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 117–136 min gate-to-gate on this route.

How often does STL–DEN fly?

3 carriers operate this route, around 78 flights a week between them. Compare carrier days and times in the airline list above.