As of my most recent update, Boston Logan International Airport's (BOS) Terminal B serves as the home base for Southwest Airlines. For the most recent information, Southwest Airlines BOS Terminal  advisable to confirm directly with the airline or the airport, though, as terminal allocations are subject to change on occasion.

Southest airlines are using the terminal B for their incoming and out going flights also if you are still unaware of the terminal then you can go to the office and get the informations.

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