If your checked baggage doesn't arrive on a Southwest Airlines flight, here's what to do:

1. Report the baggage delay immediately:

   • Go to the Southwest Airlines Baggage Service Desk at the airport (located in the baggage claim area or at the ticket counter) or report online via the Southwest Airlines website.

   • For domestic itineraries, you must report within four hours of arrival. For international itineraries, you must report within seven calendar days.

   • You'll receive a file reference number (8-10 digits) which you'll need to track your bags and file a compensation claim.

2. Track your bag online:

   • Use the file reference number you received to track your baggage on the Southwest Airlines website.

   • Note that baggage tracking information is only available for Southwest-operated flights if your itinerary involves a partner airline.

3. Submit a baggage compensation claim (if needed):

   • If Southwest cannot locate your baggage within five days, you can file a claim for compensation through their baggage claim portal.

   • You'll need your bag tag, ticket/boarding pass, photos of your baggage (if available), and a copy of your government-issued photo ID.

   • Southwest typically processes claims within 2-4 weeks, but complex situations may take longer. 

Important things to remember

• Time limits are crucial: Make sure to report the delay and file any necessary claims within the specified timeframes or you risk denial of compensation.

• Southwest's Liability: Southwest's liability for lost baggage is capped at a certain amount, which varies depending on whether your flight is domestic or international.

• Keep documentation: Retain your bag tag, boarding pass, claim forms, and any receipts for incidental expenses incurred due to the lost baggage.

• Southwest is not liable for: damage from normal wear and tear, manufacturing defects, improper packing, or damage caused by the TSA.

• Consider Travel Insurance and Credit Card benefits: These may offer additional coverage for lost baggage and related expenses, notes TripIt.