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Route Reliability

Denver → St. Louis

DEN–STL · 770 miles · Denver International Airport to St. Louis Lambert International Airport

85
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
7 min
Average arrival delay
0.3%
Cancelled
3,645
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Frontier Airlines90%264 flights
  2. 2.United Airlines79%1,213 flights
  3. 3.Southwest Airlines77%2,168 flights

What the data says

Morning-you made the right choice.

DEN–STL flights departing between 3–6 AM arrived on time 97% of the time, versus 61% between 9 PM–12 AM.

Wednesday has been the better bet.

A small edge: 81% on time on Wednesdays against 75% on Sundays.

Frontier Airlines runs this route best.

Frontier Airlines arrived on time 90% of the time on this route; Southwest Airlines managed 77%.

It basically never cancels.

Out of 3,645 scheduled flights, only 0.3% were cancelled.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon79%(547 flights)
  • Tue81%(480 flights)
  • Wed81%(528 flights)
  • Thu76%(523 flights)
  • Fri77%(559 flights)
  • Sat81%(437 flights)
  • Sun75%(552 flights)
On-time by departure window
  • 3–6 AM97%(139 flights)
  • 6–9 AM93%(654 flights)
  • 9 AM–12 PM84%(816 flights)
  • 12–3 PM81%(626 flights)
  • 3–6 PM70%(645 flights)
  • 6–9 PM61%(692 flights)
  • 9 PM–12 AM61%(54 flights)
On-time trend by month
74%
May

Jun 68% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%340
July 202567%350
August 202571%326
September 202584%325
October 202587%333
November 202584%273
December 202581%265
January 202687%250
February 202688%252
March 202678%315
April 202681%286
May 202674%311

Keep nerding

Based on 3,645 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.