Route
STL → MKE
St. Louis Lambert International Airport General Mitchell International Airport
How punctual is this route?
- On-time arrivals
- 81.5%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 686
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 61%
- Airline (crew, maintenance, cleaning) 30%
- Air traffic control & airport 7%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.7% | 60 |
| October 2025 | 86.0% | 57 |
| November 2025 | 77.4% | 54 |
| December 2025 | 79.3% | 58 |
| January 2026 | 71.9% | 57 |
| February 2026 | 92.3% | 52 |
| March 2026 | 76.5% | 54 |
| April 2026 | 81.0% | 58 |
| May 2026 | 91.8% | 61 |
| June 2026 | 76.8% | 56 |
| July 2026 | 79.3% | 58 |
| August 2026 | 78.7% | 61 |
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 | 686 | 81.5% | 0.6% | 64 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN4497
17% late · 58 flights
-
WN4496
7% late · 57 flights
-
WN705
25% late · 55 flights
-
WN3406
29% late · 51 flights
-
WN3805
22% late · 50 flights
-
WN2944
19% late · 47 flights
-
WN2556
22% late · 45 flights
-
WN4775
11% late · 35 flights
-
WN1073
46% late · 28 flights
-
WN3153
4% late · 28 flights
-
WN4500
11% late · 28 flights
-
WN4588
23% late · 26 flights
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