Route
MCI → STL
Kansas City International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 85.1%
- Less than 15 minutes late
- Cancelled
- 0.5%
- Of scheduled flights
- Average delay when late
- 57 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,017
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 71%
- Airline (crew, maintenance, cleaning) 20%
- Air traffic control & airport 7%
- Extreme weather 1%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.1% | 90 |
| October 2025 | 86.4% | 88 |
| November 2025 | 87.7% | 81 |
| December 2025 | 89.3% | 85 |
| January 2026 | 91.3% | 70 |
| February 2026 | 94.4% | 71 |
| March 2026 | 84.9% | 87 |
| April 2026 | 84.9% | 86 |
| May 2026 | 81.4% | 88 |
| June 2026 | 77.8% | 90 |
| July 2026 | 80.2% | 92 |
| August 2026 | 75.3% | 89 |
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 | 1,017 | 85.1% | 0.5% | 57 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2493
2% late · 58 flights
-
WN4015
4% late · 57 flights
-
WN3552
15% late · 55 flights
-
WN2585
10% late · 52 flights
-
WN3113
11% late · 47 flights
-
WN4161
2% late · 46 flights
-
WN2083
12% late · 44 flights
-
WN4341
42% late · 43 flights
-
WN3066
28% late · 40 flights
-
WN2477
18% late · 39 flights
-
WN594
12% late · 33 flights
-
WN3065
19% late · 32 flights
-
WN332
3% late · 31 flights
-
WN4504
0% late · 31 flights
-
WN3824
24% late · 29 flights
-
WN1654
26% late · 23 flights
-
WN2494
18% late · 22 flights
-
WN3662
14% late · 22 flights
-
WN2074
10% late · 21 flights
-
WN2538
55% late · 20 flights
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