St Louis (STL) to Chicago (MDW) flights
Southwest Airlines flies nonstop from St. Louis Lambert International Airport to Chicago Midway International Airport, with about 40 flights a week in July 2026. The 251-mile flight takes about 1h 2m gate to gate.
- Distance
- 251 mi · 404 km
- Flight time
- 1h 2m
- Airlines
- 1
- Seats filled
- 63%
Airlines flying STL to MDW
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 40 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 177,191 | 1h 2m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to MDW flight schedule
10 flight numbers flew this route in August 2026, 4 of them almost daily. The first usually leaves at 6:00am and the last at 8:50pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| WN 4752Southwest Airlines | 6:00am | 7:05am | 4 | n/a |
| WN 2052Southwest Airlines | 6:05am | 7:10am | 28 | 82% |
| WN 2814Southwest Airlines | 8:50am | 9:55am | 4 | n/a |
| WN 3861Southwest Airlines | 11:05am | 12:15pm | 24 | 83% |
| WN 3862Southwest Airlines | 2:20pm | 3:25pm | 24 | 63% |
| WN 2742Southwest Airlines | 3:30pm | 4:35pm | 4 | n/a |
| WN 3864Southwest Airlines | 3:45pm | 4:50pm | 8 | n/a |
| WN 3001Southwest Airlines | 6:15pm | 7:20pm | 12 | 33% |
| WN 2032Southwest Airlines | 7:30pm | 8:35pm | 4 | n/a |
| WN 3865Southwest Airlines | 8:50pm | 9:55pm | 20 | 75% |
Is STL to MDW on time?
From September 2025 to August 2026, 80% of 1,698 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 6am were the most punctual (94%), those around 4pm the least (60%). Most delay time was caused by late-arriving aircraft (49%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 1,698 | 80% | 12 min | 1.2% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 5am to 6am | 194 | 91% | |
| 6am to 7am | 91 | 94% | |
| 7am to 8am | 103 | 86% | |
| 8am to 9am | 111 | 90% | |
| 9am to 10am | 51 | 84% | |
| 10am to 11am | 111 | 83% | |
| 11am to 12pm | 63 | 85% | |
| 12pm to 1pm | 44 | 67% | |
| 1pm to 2pm | 130 | 86% | |
| 2pm to 3pm | 104 | 85% | |
| 3pm to 4pm | 69 | 74% | |
| 4pm to 5pm | 169 | 60% | |
| 5pm to 6pm | 92 | 72% | |
| 6pm to 7pm | 95 | 61% | |
| 7pm to 8pm | 47 | 75% | |
| 8pm to 9pm | 106 | 83% | |
| 9pm to 10pm | 101 | 66% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 158 | 16,981 | |
| September 2025 | 151 | 16,108 | |
| October 2025 | 132 | 14,242 | |
| November 2025 | 124 | 12,286 | |
| December 2025 | 145 | 12,920 | |
| January 2026 | 123 | 8,435 | |
| February 2026 | 115 | 8,601 | |
| March 2026 | 153 | 15,348 | |
| April 2026 | 159 | 16,520 | |
| May 2026 | 159 | 16,368 | |
| June 2026 | 168 | 19,288 | |
| July 2026 | 178 | 20,094 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.