Chicago (MDW) to St Louis (STL) flights
Southwest Airlines flies nonstop from Chicago Midway International Airport to St. Louis Lambert International Airport, with about 39 flights a week in July 2026. The 251-mile flight takes about 1h 4m gate to gate.
- Distance
- 251 mi · 404 km
- Flight time
- 1h 4m
- Airlines
- 1
- Seats filled
- 63%
Airlines flying MDW to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 39 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 171,113 | 1h 4m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
MDW to STL flight schedule
10 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 7:55am and the last at 8:55pm. 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 2837Southwest Airlines | 7:55am | 9:15am | 28 | 82% |
| WN 2838Southwest Airlines | 9:20am | 10:30am | 16 | 81% |
| WN 370Southwest Airlines | 9:55am | 11:05am | 4 | n/a |
| WN 3877Southwest Airlines | 10:10am | 11:20am | 8 | n/a |
| WN 591Southwest Airlines | 2:00pm | 3:10pm | 8 | n/a |
| WN 2839Southwest Airlines | 3:10pm | 4:20pm | 16 | 75% |
| WN 126Southwest Airlines | 4:40pm | 5:55pm | 12 | 50% |
| WN 4254Southwest Airlines | 5:50pm | 7:05pm | 24 | 54% |
| WN 3720Southwest Airlines | 8:25pm | 9:35pm | 4 | n/a |
| WN 290Southwest Airlines | 8:55pm | 10:05pm | 12 | 25% |
Is MDW to STL on time?
From September 2025 to August 2026, 81% of 1,701 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 6am were the most punctual (97%), those around 6pm the least (61%). Most delay time was caused by late-arriving aircraft (53%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 1,701 | 81% | 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 |
|---|---|---|---|
| 6am to 7am | 129 | 97% | |
| 7am to 8am | 148 | 87% | |
| 8am to 9am | 91 | 95% | |
| 9am to 10am | 137 | 95% | |
| 10am to 11am | 93 | 88% | |
| 11am to 12pm | 135 | 84% | |
| 12pm to 1pm | 40 | 82% | |
| 1pm to 2pm | 138 | 88% | |
| 2pm to 3pm | 133 | 71% | |
| 4pm to 5pm | 70 | 71% | |
| 5pm to 6pm | 123 | 67% | |
| 6pm to 7pm | 89 | 61% | |
| 7pm to 8pm | 76 | 83% | |
| 8pm to 9pm | 88 | 70% | |
| 9pm to 10pm | 148 | 66% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 154 | 17,217 | |
| September 2025 | 151 | 16,444 | |
| October 2025 | 131 | 15,408 | |
| November 2025 | 124 | 12,055 | |
| December 2025 | 140 | 12,675 | |
| January 2026 | 120 | 9,652 | |
| February 2026 | 110 | 9,276 | |
| March 2026 | 134 | 14,215 | |
| April 2026 | 149 | 12,354 | |
| May 2026 | 156 | 14,347 | |
| June 2026 | 160 | 18,390 | |
| July 2026 | 173 | 19,080 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.