Route
STL → DEN
St. Louis Lambert International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 75.0%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 73 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,687
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 41%
- Air traffic control & airport 33%
- Airline (crew, maintenance, cleaning) 21%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 77.8% | 326 |
| October 2025 | 80.2% | 334 |
| November 2025 | 82.1% | 275 |
| December 2025 | 69.1% | 266 |
| January 2026 | 83.5% | 251 |
| February 2026 | 84.8% | 250 |
| March 2026 | 73.1% | 317 |
| April 2026 | 79.6% | 286 |
| May 2026 | 71.8% | 310 |
| June 2026 | 66.4% | 358 |
| July 2026 | 72.5% | 373 |
| August 2026 | 65.4% | 341 |
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 | 2,190 | 72.6% | 0.1% | 64 min |
| United Airlines | 1,116 | 78.8% | 0.6% | 87 min |
| Frontier Airlines | 292 | 74.5% | 0.7% | 92 min |
| SkyWest Airlines | 89 | 90.9% | 1.1% | 118 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
F94567
26% late · 270 flights
-
UA1396
15% late · 178 flights
-
UA1380
15% late · 161 flights
-
UA2625
17% late · 107 flights
-
UA2459
8% late · 102 flights
-
UA1483
44% late · 81 flights
-
UA362
10% late · 81 flights
-
WN2254
17% late · 64 flights
-
WN3909
8% late · 61 flights
-
WN3912
52% late · 61 flights
-
WN3562
17% late · 58 flights
-
WN3766
16% late · 58 flights
-
WN1688
51% late · 57 flights
-
WN4454
4% late · 57 flights
-
WN2739
27% late · 56 flights
-
OO5979
4% late · 55 flights
-
WN3910
12% late · 52 flights
-
WN3913
55% late · 52 flights
-
WN4312
29% late · 52 flights
-
WN824
40% late · 52 flights
-
WN2623
18% late · 49 flights
-
WN2952
37% late · 49 flights
-
WN4460
25% late · 49 flights
-
UA1236
17% late · 46 flights
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