Regardless whether you cancel your flight months in advance, or you miss it due to some unforeseen issue on the way to the airport, you....
https://community.articulate.com/discussions/rise-360/southwest-airlines-cancellation-policy-customer-service

Regardless whether you cancel your flight months in advance, or you miss it due to some unforeseen issue on the way to the airport, you....
https://community.articulate.com/discussions/rise-360/1-805-309-9377-southwest-airlines-cancellation-and-refund-policy