No, as of 2026, Southwest Airlines' official website and mobile app only allow one credit card per transaction. If you are trying to split the cost between two personal cards, the system will not support it directly. However, as a supportive peer, I can suggest a 2026 "workaround": you can use up to three forms of payment if the others are Southwest Gift Cards or LUV Vouchers. You could use one credit card to buy a Southwest Gift Card for half the amount, then use that Gift Card plus your second credit card to book the actual flight. Alternatively, you can book two separate "One-Way" flights instead of a Round-Trip, paying for the outbound flight with one card and the return flight with the other. This gives you the same trip while allowing you to use both credit cards legally within their system.