Route
DEN → STL
Denver International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 77.7%
- Less than 15 minutes late
- Cancelled
- 0.5%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,699
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 56%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 13%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 83.7% | 326 |
| October 2025 | 86.8% | 333 |
| November 2025 | 83.2% | 274 |
| December 2025 | 80.0% | 266 |
| January 2026 | 86.0% | 252 |
| February 2026 | 87.7% | 253 |
| March 2026 | 77.5% | 318 |
| April 2026 | 80.1% | 289 |
| May 2026 | 73.0% | 312 |
| June 2026 | 69.3% | 358 |
| July 2026 | 67.0% | 385 |
| August 2026 | 66.1% | 333 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 2,203 | 76.6% | 0.5% | 63 min |
| United Airlines | 1,116 | 78.0% | 0.4% | 71 min |
| Frontier Airlines | 292 | 82.5% | 0.3% | 56 min |
| SkyWest Airlines | 88 | 83.7% | 1.1% | 102 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA652
14% late · 344 flights
-
UA1422
31% late · 306 flights
-
F93302
18% late · 292 flights
-
UA1315
13% late · 196 flights
-
UA1639
18% late · 102 flights
-
UA214
43% late · 81 flights
-
WN2675
11% late · 63 flights
-
WN1658
28% late · 58 flights
-
WN2490
19% late · 58 flights
-
WN2102
53% late · 57 flights
-
OO5617
8% late · 54 flights
-
WN1751
10% late · 52 flights
-
WN1756
59% late · 52 flights
-
WN1753
6% late · 51 flights
-
WN1329
32% late · 50 flights
-
WN2096
2% late · 49 flights
-
WN2981
21% late · 47 flights
-
WN3152
26% late · 47 flights
-
WN319
4% late · 47 flights
-
WN3053
24% late · 46 flights
-
WN1965
5% late · 44 flights
-
WN4382
0% late · 44 flights
-
WN1373
7% late · 43 flights
-
WN2103
43% late · 42 flights
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