SWA4121 is operated by SOUTHWEST AIRLINES CO between Chicago Midway International Airport (KMDW) and Sacramento International Airport (KSMF). The flight is most often flown by a BOEING Boeing 737 MAX 8. Typical block time is 3h 51m. SkyMeter has observed 30 legs of this flight number via ADS-B.

✈
FLIGHTS
30
last 90 days
⏱
AVG DURATION
3h 51m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 06/29/2026
first → last seen
🗺
ROUTES / TYPES
5 / 3
city pairs · airframes
⚠
INCIDENT RATE
10.0%
3 flagged

Routes flown

By count · last 90 days

3
KMDW → KSMF
25
avg 4h 9m · Chicago Midway → Sacramento
KSAN → KSEA
2
avg 3h 7m · San Diego → Seattle Tacoma
KCHS → KDAL
1
avg 2h 26m · Charleston Air Force Base-International → Dallas Love Field

Aircraft types

Equipment used on this number

3
B38M BOEING Boeing 737 MAX 8
15
B738 BOEING Boeing 737-800
8
B737 BOEING Boeing 737-700
7

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
3
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 SWA4121

30
N8690ABOEING Boeing 737-800
→
06/29/2026
4h 6m
No alerts
Replay Analysis
N263WNBOEING Boeing 737-700
→
06/28/2026
4h 20m
△ Unstable
Replay Analysis
N8713MBOEING Boeing 737-800
→
06/27/2026
4h 2m
No alerts
Replay Analysis
N8821SBOEING Boeing 737 MAX 8
→
06/26/2026
4h 2m
No alerts
Replay Analysis
N886GKBOEING Boeing 737 MAX 8
→
06/25/2026
4h 18m
△ Unstable
Replay Analysis
N8680CBOEING Boeing 737-800
→
06/24/2026
4h 13m
△ Unstable
Replay Analysis
N8970QBOEING Boeing 737 MAX 8
→
06/23/2026
4h 10m
No alerts
Replay Analysis
N8545VBOEING Boeing 737-800
→
06/22/2026
3h 55m
No alerts
Replay Analysis
N240WNBOEING Boeing 737-700
→
06/21/2026
4h 16m
No alerts
Replay Analysis
N9001FBOEING Boeing 737 MAX 8
→
06/20/2026
4h 14m
No alerts
Replay Analysis
N8934QBOEING Boeing 737 MAX 8
→
06/19/2026
4h 46m
No alerts
Replay Analysis
N8934QBOEING Boeing 737 MAX 8
→
06/19/2026
17m
No alerts
Replay Analysis
N8768QBOEING Boeing 737 MAX 8
→
06/18/2026
4h 1m
No alerts
Replay Analysis
N8820LBOEING Boeing 737 MAX 8
→
06/17/2026
4h 11m
No alerts
Replay Analysis
N8792QBOEING Boeing 737 MAX 8
→
06/16/2026
3h 54m
No alerts
Replay Analysis
N8888MBOEING Boeing 737 MAX 8
→
06/15/2026
3h 58m
No alerts
Replay Analysis
N259WNBOEING Boeing 737-700
→
06/14/2026
4h 17m
No alerts
Replay Analysis
N8541WBOEING Boeing 737-800
→
06/13/2026
3h 56m
No alerts
Replay Analysis
N8815LBOEING Boeing 737 MAX 8
→
06/12/2026
4h 23m
No alerts
Replay Analysis
N8966SBOEING Boeing 737 MAX 8
→
06/11/2026
4h 18m
No alerts
Replay Analysis
N8699ABOEING Boeing 737-800
→
06/10/2026
4h 19m
No alerts
Replay Analysis
N1811UBOEING Boeing 737 MAX 8
→
06/09/2026
4h 10m
No alerts
Replay Analysis
N8895QBOEING Boeing 737 MAX 8
→
06/08/2026
3h 54m
No alerts
Replay Analysis
N7742BBOEING Boeing 737-700
→
06/07/2026
4h 5m
No alerts
Replay Analysis
N8698BBOEING Boeing 737-800
→
06/06/2026
3h 58m
No alerts
Replay Analysis
N8503ABOEING Boeing 737-800
→
06/05/2026
4h 2m
No alerts
Replay Analysis
N7886ABOEING Boeing 737-700
→
04/06/2026
2h 50m
No alerts
Replay Analysis
N8830QBOEING Boeing 737 MAX 8
→
04/04/2026
2h 25m
No alerts
Replay Analysis
N265WNBOEING Boeing 737-700
→
04/03/2026
3h 11m
No alerts
Replay Analysis
N489WNBOEING Boeing 737-700
→
04/02/2026
3h 1m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window