SWA3521 is operated by SOUTHWEST AIRLINES CO between Chicago Midway International Airport (KMDW) and Seattle Tacoma International Airport (KSEA). The flight is most often flown by a BOEING Boeing 737 MAX 8. Typical block time is 3h 2m. SkyMeter has observed 36 legs of this flight number via ADS-B.

✈
FLIGHTS
36
last 90 days
⏱
AVG DURATION
3h 2m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
7 / 2
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

3
KMDW → KSEA
23
avg 4h 0m · Chicago Midway → Seattle Tacoma
KLAS → KONT
3
avg 1h 5m · McCarran → Ontario
KSEA → KLAS
2
avg 2h 13m · Seattle Tacoma → McCarran

Aircraft types

Equipment used on this number

2
B38M BOEING Boeing 737 MAX 8
32
B738 BOEING Boeing 737-800
4

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
0
Rejected TO
0
Stall warnings
0
Overspeeds
0
Runway excursion
0
Counts represent flights with at least one occurrence of each flag, not the total event count. See /incidents for individual events.

Recent flights

Newest 30 operations of SWA3521

30
N8647ABOEING Boeing 737-800
→
06/03/2026
3h 47m
No alerts
Replay Analysis
N8668ABOEING Boeing 737-800
→
06/02/2026
3h 56m
No alerts
Replay Analysis
N8806QBOEING Boeing 737 MAX 8
→
06/01/2026
3h 49m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
06/01/2026
59m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
05/31/2026
15m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
05/31/2026
21m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
05/31/2026
2h 0m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
05/31/2026
3h 48m
No alerts
Replay Analysis
N8887QBOEING Boeing 737 MAX 8
→
05/29/2026
1h 40m
No alerts
Replay Analysis
N8551QBOEING Boeing 737-800
→
05/28/2026
3h 45m
No alerts
Replay Analysis
N8867QBOEING Boeing 737 MAX 8
→
05/26/2026
3h 50m
No alerts
Replay Analysis
N8816QBOEING Boeing 737 MAX 8
→
05/25/2026
3h 59m
No alerts
Replay Analysis
N8847QBOEING Boeing 737 MAX 8
→
05/24/2026
4h 1m
No alerts
Replay Analysis
N872CBBOEING Boeing 737 MAX 8
→
05/23/2026
3h 59m
No alerts
Replay Analysis
N8753QBOEING Boeing 737 MAX 8
→
05/21/2026
4h 2m
No alerts
Replay Analysis
N8736JBOEING Boeing 737 MAX 8
→
05/20/2026
4h 13m
No alerts
Replay Analysis
N8977GBOEING Boeing 737 MAX 8
→
05/18/2026
3h 57m
No alerts
Replay Analysis
N8818QBOEING Boeing 737 MAX 8
→
05/18/2026
1h 8m
No alerts
Replay Analysis
N8818QBOEING Boeing 737 MAX 8
→
05/17/2026
26m
No alerts
Replay Analysis
N8818QBOEING Boeing 737 MAX 8
→
05/17/2026
16m
No alerts
Replay Analysis
N8818QBOEING Boeing 737 MAX 8
→
05/17/2026
1h 53m
No alerts
Replay Analysis
N8818QBOEING Boeing 737 MAX 8
→
05/17/2026
3h 49m
No alerts
Replay Analysis
N8909LBOEING Boeing 737 MAX 8
→
05/16/2026
3h 58m
No alerts
Replay Analysis
N8893LBOEING Boeing 737 MAX 8
→
05/15/2026
4h 7m
No alerts
Replay Analysis
N8892SBOEING Boeing 737 MAX 8
→
05/14/2026
4h 6m
No alerts
Replay Analysis
N8721JBOEING Boeing 737 MAX 8
→
04/25/2026
4h 9m
No alerts
Replay Analysis
N8716BBOEING Boeing 737 MAX 8
→
04/24/2026
3h 53m
No alerts
Replay Analysis
N8869LBOEING Boeing 737 MAX 8
→
04/23/2026
3h 55m
No alerts
Replay Analysis
N8985QBOEING Boeing 737 MAX 8
→
04/21/2026
4h 4m
No alerts
Replay Analysis
N8770QBOEING Boeing 737 MAX 8
→
04/20/2026
4h 8m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window