Route
STL → MDW
St. Louis Lambert International Airport Chicago Midway International Airport
How punctual is this route?
- On-time arrivals
- 79.5%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 58 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,698
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 49%
- Airline (crew, maintenance, cleaning) 27%
- Air traffic control & airport 20%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 83.4% | 151 |
| October 2025 | 80.8% | 130 |
| November 2025 | 90.2% | 127 |
| December 2025 | 78.3% | 139 |
| January 2026 | 86.7% | 121 |
| February 2026 | 90.1% | 111 |
| March 2026 | 71.8% | 136 |
| April 2026 | 83.8% | 150 |
| May 2026 | 83.9% | 157 |
| June 2026 | 70.3% | 161 |
| July 2026 | 71.1% | 169 |
| August 2026 | 69.7% | 146 |
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 | 1,698 | 79.5% | 1.2% | 58 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3957
35% late · 60 flights
-
WN1008
11% late · 59 flights
-
WN1764
29% late · 58 flights
-
WN4489
7% late · 58 flights
-
WN826
16% late · 57 flights
-
WN1837
4% late · 55 flights
-
WN4438
17% late · 55 flights
-
WN3721
7% late · 54 flights
-
WN3116
19% late · 47 flights
-
WN1052
10% late · 39 flights
-
WN1517
9% late · 36 flights
-
WN2570
14% late · 36 flights
-
WN556
43% late · 36 flights
-
WN373
50% late · 33 flights
-
WN4549
41% late · 33 flights
-
WN770
20% late · 33 flights
-
WN3613
6% late · 32 flights
-
WN2328
10% late · 31 flights
-
WN2526
23% late · 31 flights
-
WN2052
18% late · 28 flights
-
WN3801
4% late · 28 flights
-
WN649
11% late · 28 flights
-
WN3320
19% late · 27 flights
-
WN3344
42% late · 27 flights
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