Route
MDW → STL
Chicago Midway International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 80.5%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,701
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 53%
- Airline (crew, maintenance, cleaning) 34%
- Air traffic control & airport 11%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 92.7% | 151 |
| October 2025 | 86.9% | 130 |
| November 2025 | 85.4% | 127 |
| December 2025 | 78.3% | 139 |
| January 2026 | 84.2% | 120 |
| February 2026 | 88.2% | 110 |
| March 2026 | 74.2% | 136 |
| April 2026 | 85.2% | 151 |
| May 2026 | 79.2% | 156 |
| June 2026 | 73.0% | 162 |
| July 2026 | 75.3% | 172 |
| August 2026 | 67.1% | 147 |
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 | 1,701 | 80.5% | 1.2% | 63 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2900
5% late · 60 flights
-
WN2905
36% late · 60 flights
-
WN3207
19% late · 58 flights
-
WN2770
17% late · 53 flights
-
WN2901
24% late · 52 flights
-
WN2902
22% late · 52 flights
-
WN3395
40% late · 50 flights
-
WN3396
30% late · 50 flights
-
WN2630
4% late · 48 flights
-
WN2960
13% late · 47 flights
-
WN2903
39% late · 43 flights
-
WN2904
32% late · 43 flights
-
WN4089
5% late · 42 flights
-
WN2799
27% late · 41 flights
-
WN2773
14% late · 36 flights
-
WN1542
3% late · 33 flights
-
WN2253
39% late · 33 flights
-
WN2458
18% late · 33 flights
-
WN1862
0% late · 32 flights
-
WN3771
13% late · 31 flights
-
WN3788
14% late · 30 flights
-
WN3906
0% late · 30 flights
-
WN2837
18% late · 28 flights
-
WN2012
0% late · 27 flights
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