Flight
SWA3521 12 Apr 2026
SWA3521, operated by Southwest Airlines, on 12 Apr 2026: Chicago Midway International (KMDW) to Seattle Tacoma International (KSEA), 2 legs. Scheduled and actual times are local to each airport (hover for UTC).
Leg 1 of 2
PlaneTrack receiver network| Route | KMDW CHICAGO MIDWAY INTERNATIONAL → KSEA SEATTLE TACOMA INTERNATIONAL |
| Status | Completed (receiver network) |
| First seen airborne | 10:45 CDT |
| Last seen | 12:34 PDT |
| Duration | 3h 48m |
| Aircraft | AC4F4C |
| Max altitude | 36,000 ft |
| Distance tracked | 1,502 nm |
Leg 2 of 2
PlaneTrack receiver network| Route | KSEA SEATTLE TACOMA INTERNATIONAL → KLAS MC CARRAN INTERNATIONAL |
| Status | Completed (receiver network) |
| First seen airborne | 14:16 PDT |
| Last seen | 16:28 PDT |
| Duration | 2h 11m |
| Aircraft | AC4F4C |
| Max altitude | 37,000 ft |
| Distance tracked | 753 nm |
Punctuality, last 30 days
| Flights | 5 |
| On time | 4 (80%) |
| Average delay | -252 min |
| Worst delay | +81 min |
In the last 30 days SWA3521 departed on time (within 15 minutes) on 4 of 5 flights (80%), with an average departure delay of -252 min and a worst delay of +81 min.
Schedule, departure and arrival times from the FAA SWIM feed; aircraft, altitude and distance from the PlaneTrack receiver network. On time means a departure within 15 minutes of schedule.