PlainFlights

Route · DEN → STL · 2020–2025 BTS data

Denver to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), DEN to STL (Denver to St. Louis) ranks #316 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

77.9%
On-time
-1.1 pts
vs US avg
62 min
Delay when late
20,926
Flights
#316 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Oct 2024 88%

Worst Month

Jul 2025 66%

Distance

770 mi

Carriers

27

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 266 53 0 1 WN,F9,UA
Nov 2025 274 46 1 0 OO,UA,F9,WN
Oct 2025 333 44 0 0 OO,UA,WN,F9
Sep 2025 326 53 0 1 UA,WN,OO,F9
Aug 2025 329 98 2 1 OO,WN,F9,UA
Jul 2025 352 118 0 2 OO,UA,WN,F9
Jun 2025 341 113 1 0 OO,UA,WN,F9
May 2025 329 87 3 1 OO,UA,WN,F9
Apr 2025 297 58 2 0 F9,UA,WN
Mar 2025 300 50 0 0 UA,WN,F9
Feb 2025 252 40 0 0 UA,WN,F9
Jan 2025 272 65 13 2 UA,WN,F9
Dec 2024 307 48 0 0 F9,UA,WN
Nov 2024 295 63 3 0 UA,WN,F9
Oct 2024 323 39 1 0 UA,WN,F9
Sep 2024 307 42 0 0 WN,UA,F9
Aug 2024 322 80 1 0 F9,WN,UA
Jul 2024 356 88 7 1 F9,UA,WN
Jun 2024 342 99 0 0 F9,UA,WN
May 2024 334 102 0 1 F9,UA,WN
Apr 2024 325 70 1 1 F9,UA,WN
Mar 2024 330 75 8 0 F9,UA,WN
Feb 2024 290 66 3 0 F9,OO,UA,WN
Jan 2024 309 97 8 0 F9,WN,OO,UA

DEN–STL seasonal on-time pattern

Best: November (84.1%) · weakest: July (70.5%)

65%70%75%80%85% JanFebMarAprMayJunJulAugSepOctNovDec 79.6%

Strongest calendar month

November

84.1% on-time · ~287 flights/mo

Busiest calendar month

August

~331 flights/mo avg

Weakest calendar month

July

70.5% on-time · ~327 flights/mo

Cancellation Rate

0.7%

54 of 7,511 flights

Diversion Rate

0.1%

11 of 7,511 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

DEN - Denver

Full on-time, delay-cause, and seasonal performance for Denver, CO.

DEN on-time profile

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

Compare the two airports

See DEN and STL side by side on delays, cancellations, and reliability.

Compare DEN vs STL

Origin-hub reliability standing

Mid-pack among DEN departures

From DEN, this corridor sits with 133 other 75–85% on-time routes out of 168 tracked departures, not the hub's reliability leaders (8 at ≥85%) and not the softest ( 27 below 75%). Destination: St. Louis · fleet on-time rank #3862 of 4927.

What the Data Says About DEN to STL

The Denver to St. Louis corridor (DEN to STL) posts a 77.9% on-time rate on the lower edge of the average band, based on 20,926 tracked flights. Late flights run 62.1 minutes behind on average. 27 carriers cover the 770-mile route; over the last 24 months, 54 of 7,511 flights were cancelled (0.7%) and 0.1% diverted.

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 88% on-time, while Jul 2025 came in at just 66% - a 21-point swing worth factoring into travel timing.

On the multi-year calendar, DEN–STL peaks in November at 84.1% on-time while August carries the heaviest traffic (~331 flights per month) ; the softest month is July at 70.5%, a 13.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does DEN to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, DEN to STL ranks #316 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from DEN to STL? ▼
Flights from Denver to St. Louis have a 77.9% on-time rate based on 20,926 flights. The average delay is 62.1 minutes. The best recent month was Oct 2024 with 88% on-time.
What is the cancellation rate for DEN to STL? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (54 of 7,511 flights) and 0.1% were diverted.
How far is the flight from DEN to STL? ▼
The flight distance from Denver (DEN) to St. Louis (STL) is approximately 770 miles. This route is served by 27 carriers.
When is the best time to fly from DEN to STL? ▼
The best recent month for on-time performance was Oct 2024 (88% on-time). The worst was Jul 2025 (66% on-time). Consider booking during months with historically better performance.

Airports on this route

DEN Airport

Denver
STL Airport

St. Louis
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 DEN–STL data

DEN–STL is mid-pack at 77.9% on-time; month and carrier mix move more than the corridor headline.

  • Compare DEN and STL airport profiles: delay causes and top routes differ even on the same corridor. DEN airport
  • If your dates flex, November (84.1% on-time) beats July (70.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 77.9% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.