Seattle (SEA) to Chicago (MDW) flights
Southwest Airlines flies nonstop from Seattle-Tacoma International Airport to Chicago Midway International Airport, with about 20 flights a week in July 2026. The 1,733-mile flight takes about 3h 48m gate to gate.
- Distance
- 1,733 mi · 2,789 km
- Flight time
- 3h 48m
- Airlines
- 1
- Seats filled
- 84%
Airlines flying SEA to MDW
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 20 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 96,586 | 3h 48m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to MDW flight schedule
7 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 5:15am and the last at 11:05pm. 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 662Southwest Airlines | 5:15am | 11:15am | 12 | 100% |
| WN 1396Southwest Airlines | 5:20am | 11:15am | 8 | n/a |
| WN 2194Southwest Airlines | 7:40am | 1:40pm | 8 | n/a |
| WN 3628Southwest Airlines | 10:20am | 4:30pm | 4 | n/a |
| WN 247Southwest Airlines | 10:45am | 4:50pm | 8 | n/a |
| WN 142Southwest Airlines | 10:50am | 4:55pm | 12 | 75% |
| WN 3534Southwest Airlines | 11:05pm | 5:05am | 28 | 61% |
Is SEA to MDW on time?
From September 2025 to August 2026, 83% of 678 flights arrived within 15 minutes of schedule and 0.4% were cancelled. Flights leaving around 6am were the most punctual (95%), those around 11pm the least (74%). Most delay time was caused by late-arriving aircraft (49%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 678 | 83% | 8 min | 0.4% |
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 | 178 | 94% | |
| 6am to 7am | 145 | 95% | |
| 7am to 8am | 21 | 100% | |
| 10am to 11am | 53 | 75% | |
| 11am to 12pm | 27 | 50% | |
| 1pm to 2pm | 27 | 37% | |
| 11pm to 12am | 211 | 74% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 88 | 14,916 | |
| September 2025 | 86 | 12,401 | |
| October 2025 | 33 | 4,675 | |
| November 2025 | 29 | 3,708 | |
| December 2025 | 31 | 4,138 | |
| January 2026 | 31 | 3,649 | |
| February 2026 | 28 | 3,403 | |
| March 2026 | 56 | 7,016 | |
| April 2026 | 60 | 7,968 | |
| May 2026 | 62 | 7,769 | |
| June 2026 | 81 | 12,557 | |
| July 2026 | 87 | 14,386 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.