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WN4121 Flight Status Southwest Airlines: San Diego to Seattle (SWA4121)

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WN 4121 San Diego to Seattle Flight Status

Southwest Airlines Flight WN4121 from San Diego International Airport SAN to Seattle Tacoma International Airport SEA is not scheduled for today June 4th, 2026.
The last time the flight was scheduled was on April 6th, 2026.
Check the table below for WN4121's most recent flight history:

WN 4121 Flight Status & Schedule

Date Departure Arrival Status
Apr 06 11:02 13:37
Landed
 Track >
Apr 03 11:22 13:55
Landed
 Track >
Apr 02 11:32 14:10
Landed
 Track >
Mar 30 11:18 13:44
Landed
 Track >
Mar 27 11:42 14:00
Landed
 Track >
< All SAN Departures All SEA Arrivals >

Southwest Airlines WN 4121 San Diego to Seattle Flight Information

Southwest Airlines Flight WN4121 connects San Diego, United States to Seattle, United States, taking off from San Diego International Airport SAN and landing at Seattle Tacoma International Airport SEA.

How long is the WN4121 flight from San Diego to Seattle?

The average flight time from San Diego to Seattle is 2 hours and 29 minutes. The flight distance is 1692 km / 1051 miles and the average flight speed is 683 km/h / 424 mph.

What is the On-Time Performance (OTP) of Southwest Airlines Flight WN4121 San Diego to Seattle?

The Airportia On-Time Performance Rating for Southwest Airlines Flight WN4121 is 5/5 stars. This metric is calculated using data from the past 10 flights.

Which terminal is the flight WN4121 arriving at?

Flight WN4121 arrives at Seattle Tacoma International Airport (SEA) Terminal 2.

When was the latest WN4121 flight?

The latest flight took off on Monday, April 6th, 2026 with the flight status being Landed on 13:37.

How else can the flight WN4121 be referenced as?

This Southwest Airlines flight can also be referenced as SWA4121, WN 4121, SWA 4121.

How often is flight WN4121 delayed?

On average, 20% of all WN4121 flights are delayed. The average delay is 7 minutes.

Can I get compensation for my delayed or cancelled WN4121 flight or baggage issues?

If your WN4121 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.

See our WN4121 Flight Tracker above for more details.

WN4121 and San Diego SAN to Seattle SEA Flights

Other flights departing from San Diego SAN: WN554, WN999, WN4627, WN3088

Other flights arriving at Seattle SEA: AS9460, DL396, AA3235, WN1217

All flights connecting San Diego SAN to Seattle SEA.

WN4121 Southwest Airlines Flight: San Diego to Seattle Route Map

Flight Delay Compensation up to 600€/$: Claim for delay, cancellation, or baggage issues >
New Flights: MW1435 2E3424 FR7487 MH8257 6K7388 GQ722 N8492 5Y1776 2I4287 VB960
See Also: Flight Tracker Airports Airlines News Flights Monitor Delay Compensation
Flight-schedule data supplied by Aviation Edge Real-time Flight Schedules API.