Route · STL → DEN · 2020–2025 BTS data
St. Louis to Denver
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to DEN (St. Louis to Denver) ranks #310 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 79.9%
- On-time
- +0.9 pts
- vs US avg
- 71 min
- Delay when late
- 20,999
- Flights
- #310 of 4927
- Corpus placement
Cancelled
0.9%
Best Month
Oct 2024 87%
Worst Month
May 2024 66%
Distance
770 mi
Carriers
27
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 266 | 82 | 0 | 1 | WN,F9,UA |
| Nov 2025 | 275 | 49 | 1 | 0 | UA,F9,WN |
| Oct 2025 | 334 | 66 | 0 | 0 | OO,UA,WN,F9 |
| Sep 2025 | 326 | 72 | 0 | 1 | UA,WN,OO,F9 |
| Aug 2025 | 330 | 96 | 0 | 3 | OO,WN,F9,UA |
| Jul 2025 | 352 | 118 | 5 | 5 | OO,UA,WN,F9 |
| Jun 2025 | 339 | 113 | 0 | 4 | OO,UA,WN,F9 |
| May 2025 | 317 | 93 | 2 | 1 | OO,UA,WN,F9 |
| Apr 2025 | 284 | 91 | 2 | 0 | F9,UA,WN |
| Mar 2025 | 293 | 59 | 0 | 0 | UA,WN,F9 |
| Feb 2025 | 252 | 49 | 0 | 0 | UA,WN,F9 |
| Jan 2025 | 272 | 44 | 17 | 0 | UA,WN,F9 |
| Dec 2024 | 308 | 46 | 1 | 0 | F9,UA,WN |
| Nov 2024 | 297 | 40 | 2 | 0 | UA,WN,F9 |
| Oct 2024 | 325 | 41 | 0 | 0 | UA,WN,F9 |
| Sep 2024 | 307 | 39 | 1 | 0 | WN,UA,F9 |
| Aug 2024 | 322 | 70 | 3 | 0 | F9,WN,UA |
| Jul 2024 | 356 | 97 | 6 | 0 | F9,UA,WN |
| Jun 2024 | 344 | 99 | 0 | 1 | F9,UA,WN |
| May 2024 | 348 | 119 | 0 | 1 | F9,UA,WN |
| Apr 2024 | 337 | 64 | 5 | 0 | F9,UA,WN |
| Mar 2024 | 340 | 59 | 8 | 0 | F9,UA,WN |
| Feb 2024 | 289 | 53 | 2 | 0 | F9,UA,WN |
| Jan 2024 | 310 | 66 | 10 | 1 | F9,WN,OO,UA |
STL–DEN seasonal on-time pattern
Best: November (87.3%) · weakest: July (70.9%)
Strongest calendar month
November
87.3% on-time · ~289 flights/mo
Busiest calendar month
August
~331 flights/mo avg
Weakest calendar month
July
70.9% on-time · ~326 flights/mo
Cancellation Rate
0.9%
65 of 7,523 flights
Diversion Rate
0.2%
18 of 7,523 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
STL on-time profileDEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
DEN on-time profileCompare the two airports
See STL and DEN side by side on delays, cancellations, and reliability.
Compare STL vs DENOrigin-hub reliability standing
Mid-pack among STL departures
From STL, this corridor sits with 45 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 1 below 75%). Destination: Denver · fleet on-time rank #3208 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–DEN.
Routes with a similar on-time rate
What the Data Says About STL to DEN
20,999 tracked flights put the STL to DEN pairing (St. Louis to Denver) at a 79.9% on-time rate, squarely in line with the wider network. Delays that do occur run 71.2 minutes on average. Across the 770-mile route and its 27 carriers, the trailing 24 months show 0.9% cancelled and 0.2% diverted (7,523 flights sampled).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 87% on-time, while May 2024 came in at just 66% - a 22-point swing worth factoring into travel timing.
On the multi-year calendar, STL–DEN peaks in November at 87.3% on-time while August carries the heaviest traffic (~331 flights per month) ; the softest month is July at 70.9%, a 16.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does STL to DEN rank among US routes by traffic? ▼
How often are flights delayed from STL to DEN? ▼
What is the cancellation rate for STL to DEN? ▼
How far is the flight from STL to DEN? ▼
When is the best time to fly from STL to DEN? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using STL–DEN data
STL–DEN is mid-pack at 79.9% on-time; month and carrier mix move more than the corridor headline.
- Compare STL and DEN airport profiles: delay causes and top routes differ even on the same corridor. STL airport
- If your dates flex, November (87.3% on-time) beats July (70.9%) on this corridor. Seasonal chart
- 4 other routes post a similar 79.9% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.