STL → DENSt Louis to Denver

live

Direct flights from St Louis (STL) to Denver (DEN): 65 nonstop departures observed each week across 3 airlines. 67% of the last 15 tracked flights arrived within 15 minutes of schedule. The median arrival is 4 minutes early. 2 of the 15 tracked flights were cancelled. 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 14 November 2026 at 07:35 UTC.

Today, STL → DEN

Sat 14 Nov · local times
  1. · F94567Frontier Airlines On schedule DEN 21:30scheduled
  2. · UA1352United Airlines On schedule DEN 10:21scheduled
  3. · UA1380United Airlines On schedule DEN 15:09scheduled
  4. · UA663United Airlines On schedule DEN 18:10scheduled
  5. · WN209Southwest Airlines On schedule DEN 18:50scheduled
  6. · WN4140Southwest Airlines On schedule DEN 08:00scheduled
  7. · WN4141Southwest Airlines On schedule DEN 10:20scheduled

Checked STL board 22:18 · DEN board 00:35

STL St Louis disrupted · +261
DEN Denver disrupted · +298
1,236 km · ~2h 05m est.
dep bank 06:10–21:4565x weekly
Runs mixed · 3 airlines · 65x weekly · nonstop
67% on time

of the last 15 tracked STL → DEN flights arrived within 15 minutes

Median arrival delay is −4 min. 2 of 15 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−4 minacross the last 13 arrivals
Flight time~2h 05mestimated from route distance
Weekly departures65x3 direct airlines on the leg
Cancelled13.3%recent route rate · 2 of 15

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 19:59 Mo We Fr Sa

Southwest AirlinesWN67% on time

Flights WN4140 06:10 daily · WN1755 08:25 Tu We · WN4141 08:25 Mo Th Fr Sa Su · WN1808 12:30 Mo Tu We Th Fr Su

United AirlinesUA67% on time

Flights UA1352 08:50 daily · UA1380 13:40 daily · UA663 16:39 daily

History

operated legs · board outcomes
11-13UA1352dep +23 → arr−4
11-13UA1380dep +8 → arr+102
11-13UA663cancelledCNX
11-13WN1808dep +23 → arr−6
11-13WN4140dep +14 → arr−18
11-13WN4141dep +27 → arr−1
11-13WN4143dep +240 → arr+220
11-13WN4144dep +158 → arr+132
11-13WN4145cancelledCNX
11-12UA1352arrived−9
11-12UA1380arrived−6
11-12UA663arrived−17
11-12WN1808arrived+0
11-12WN4140arrived−20
11-12WN4141arrived+13

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 +261 min disrupted 🌤 clear · N 0 kt Full STL delay board →
DENDenver +298 min disrupted 🌤 mostly cloudy · W 6 kt Full DEN delay board →

Weather lens

Conditions are tightest at STL and DEN: a 39% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +7 min. Both figures come from the two airports' delay records in similar weather. 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?

High disruption likely. Both endpoints currently score the same, route health score 0/100. 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 06:10 and evening departures around 17:25 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 65 flights a week between them. Compare carrier days and times in the airline list above.