Chicago (MDW) to Seattle (SEA) flights
Southwest Airlines flies nonstop from Chicago Midway International Airport to Seattle-Tacoma International Airport, with about 20 flights a week in July 2026. The 1,733-mile flight takes about 4h 28m gate to gate.
- Distance
- 1,733 mi · 2,789 km
- Flight time
- 4h 28m
- Airlines
- 1
- Seats filled
- 87%
Airlines flying MDW to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 20 | Boeing 737 MAX 8, Boeing 737-700 / MAX 7, Boeing 737-800 | 95,813 | 4h 28m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
MDW to SEA flight schedule
4 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 10:25am and the last at 9:20pm. 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 359Southwest Airlines | 10:25am | 12:55pm | 4 | n/a |
| WN 2825Southwest Airlines | 10:45am | 1:15pm | 24 | 21% |
| WN 2826Southwest Airlines | 3:55pm | 6:20pm | 24 | 33% |
| WN 2827Southwest Airlines | 9:20pm | 11:55pm | 28 | 64% |
Is MDW to SEA on time?
From September 2025 to August 2026, 60% of 678 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 8am were the most punctual (78%), those around 5pm the least (46%). Most delay time was caused by late-arriving aircraft (45%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 678 | 60% | 23 min | 0.6% |
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 |
|---|---|---|---|
| 8am to 9am | 42 | 78% | |
| 9am to 10am | 15 | 67% | |
| 10am to 11am | 221 | 62% | |
| 12pm to 1pm | 36 | 78% | |
| 2pm to 3pm | 17 | 77% | |
| 3pm to 4pm | 20 | 30% | |
| 5pm to 6pm | 68 | 46% | |
| 6pm to 7pm | 14 | 57% | |
| 9pm to 10pm | 159 | 59% | |
| 10pm to 11pm | 31 | 52% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 87 | 12,728 | |
| September 2025 | 87 | 11,703 | |
| October 2025 | 33 | 4,339 | |
| November 2025 | 29 | 4,112 | |
| December 2025 | 30 | 4,469 | |
| January 2026 | 31 | 4,103 | |
| February 2026 | 28 | 3,666 | |
| March 2026 | 57 | 7,897 | |
| April 2026 | 60 | 7,988 | |
| May 2026 | 62 | 9,778 | |
| June 2026 | 83 | 12,204 | |
| July 2026 | 87 | 12,826 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.