Free Guide to Southwest Checked Bag Policies

Overview of Southwest Airlines Checked Bag Policy

Southwest Airlines operates one of the most straightforward checked baggage policies in the U.S. airline industry. Unlike many competitors that charge fees for checked bags, Southwest permits two free checked bags on all domestic flights, regardless of ticket type or booking class. This policy has remained consistent since 1973, making it a defining feature of the airline's business model.

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The first checked bag can weigh up to 50 pounds and measure up to 62 inches in total dimensions (length plus width plus height). The second checked bag follows the same weight and size limits. Both bags must fit within these parameters to avoid additional charges. This guide covers the details of what Southwest allows, how to prepare your bags, and what to expect when traveling with checked luggage.

Understanding these policies matters because airlines structure their revenue differently. While Southwest includes checked bags in your ticket price, other major carriers like American, Delta, and United charge $30 to $35 for the first checked bag and $40 to $45 for the second on standard economy tickets. For a family of four traveling round-trip, this difference can amount to $240 to $360 in additional fees with competitors.

Southwest serves approximately 150 destinations across the United States, Caribbean, and Central America. The airline carries over 150 million passengers annually, and baggage policies remain uniform across this entire network. Whether you're flying from Los Angeles to New York or from Albuquerque to Hawaii, the same checked bag rules apply.

Practical Takeaway: Before booking any airline ticket, compare total costs including baggage fees. Southwest's two free checked bags can provide significant savings, particularly for families, longer trips, or travelers who need to bring substantial luggage.

Weight and Size Requirements for Checked Bags

Each checked bag at Southwest must meet specific weight and dimension standards. The maximum weight limit is 50 pounds per bag. The maximum total dimensions (length plus width plus height) cannot exceed 62 inches. These limits exist for safety, handling, and cargo hold capacity reasons. Bags exceeding these limits incur an overweight/oversized fee of $75 per bag on the first violation, increasing to $100 for subsequent violations.

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To measure your bag correctly, use a tape measure and add the three dimensions together. For example, a bag measuring 24 inches long, 16 inches wide, and 10 inches tall totals 50 inches in combined dimensions—well within the limit. Most standard rolling suitcases fall between 48 and 60 inches when measured this way. Large rolling bags designed for checked luggage typically comply with these dimensions, but oversized pieces or hard-shell luggage marketed for international travel may exceed the limit.

Weight becomes important when packing multiple items. A 50-pound limit means you cannot fill a bag with dense items like books, weights, or tools without exceeding this threshold. Using a bathroom scale at home before heading to the airport helps prevent surprises at check-in. Place your bag on the scale to confirm the weight. If you're borderline, remove items to get below the limit.

Southwest's second free checked bag operates under identical restrictions. You cannot combine two oversized bags into what Southwest considers a single oversized item. Each bag is assessed independently. If traveling with a companion, you could each check two bags, giving you four bags total at no additional charge—a advantage over competitors who typically charge per person for bags beyond the first.

Soft-sided luggage provides some advantage because it can compress slightly when needed, potentially fitting dimensional limits more easily than rigid hard-shell cases. However, once you've exceeded the weight limit, compression doesn't help. Pack strategically by placing heavier items in the center of the bag and distributing weight evenly.

Practical Takeaway: Measure and weigh your bag before arriving at the airport. Keep luggage under 50 pounds and total dimensions under 62 inches to avoid fees. Most standard checked luggage meets these requirements, but oversized specialty luggage may not.

What Items Can and Cannot Be Checked

Southwest follows federal Transportation Security Administration (TSA) regulations regarding prohibited items. Certain items cannot be packed in checked bags under any circumstances. These include firearms (which require special declaration and handling), explosives, flammable materials, certain chemicals, lithium batteries above specific watt-hour ratings, and compressed gas cylinders. Attempting to check prohibited items can result in federal fines up to $75,000 and potential criminal charges.

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Electronics present a nuanced situation. Most common electronics—laptops, tablets, cameras, and phone chargers—can be checked without issue. However, items with large lithium batteries, such as power banks over 160 watt-hours, hover in a gray area. Spare lithium batteries cannot be packed in checked bags; they must travel in carry-on luggage only. If you're traveling with photography equipment, drones, or other battery-powered devices, check the specific battery specifications before packing to avoid confiscation.

Liquids and gels in checked bags are not subject to the 3.4-ounce rule that applies to carry-on luggage. You can pack full-sized bottles of shampoo, lotion, sunscreen, and other toiletries in checked bags without restriction, provided they comply with hazardous material regulations. Alcohol is permitted in checked luggage—up to one liter in a sealed container—but not in carry-on bags. Many travelers pack toiletries and liquids exclusively in checked bags to avoid carry-on space constraints.

Sharp items like scissors, utility knives, and razors cannot be packed in carry-on bags but are allowed in checked luggage if sheathed or otherwise protected to prevent baggage handler injury. Sporting equipment such as golf clubs, fishing rods, skis, and baseball bats can be checked. Some items, particularly oversized sporting equipment, may incur additional fees beyond the standard checked bag allowance, so confirm specifics when booking if you're traveling with specialized gear.

Medications in original containers with labels are permitted in checked bags, though keeping medications in carry-on luggage provides more security and accessibility. Pet medications should be treated the same as human medications. Animals themselves cannot be placed in checked baggage; they require separate pet transport through Southwest's approved pet program with specific fees and requirements.

Practical Takeaway: Review the TSA prohibited items list before packing. Most everyday items are fine to check, but batteries, firearms, and hazardous materials require special attention. When in doubt, contact Southwest before your flight rather than discovering issues at the airport.

Special Circumstances and Additional Fees

While two checked bags are free on standard tickets, certain conditions trigger additional baggage fees. Overweight bags (51+ pounds) or oversized bags (exceeding 62 inches in total dimensions) incur a $75 fee for the first violation and $100 for subsequent violations during the same itinerary. A family checking four bags, with one exceeding the weight limit, would pay $75 for that single oversized bag while the other three remain free.

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Third and fourth checked bags are charged at $75 each on domestic flights. If you need to bring four bags on a domestic Southwest flight, the pricing structure is: first bag free, second bag free, third bag $75, fourth bag $75. International flights to destinations like Mexico, the Caribbean, and Central America follow different rules—some routes allow only one free checked bag, while others maintain the two-bag policy. Check your specific international route before booking.

Certain passenger statuses receive baggage perks. Southwest Rapid Rewards members at the A-List level and above receive a third free checked bag. Those with premium cabin tickets (Business Select) also receive this benefit. Military personnel on active duty receive a free third checked bag with proper identification. These exceptions recognize specific traveler categories but don't change the base policy for standard ticket holders.

Connecting flights on Southwest don't require reclaiming and rechecking bags. Your luggage automatically transfers to your final destination as long as you're traveling on the same Southwest confirmation number. If you have a connection through a partner airline or a different airline entirely, you'll need to reclaim checked bags at the connection point and recheck them for the next leg. This distinction matters when planning multi-carrier itineraries.

Lost or damaged checked bags follow Southwest's liability procedures. The airline limits liability to $3,500 per checked bag for domestic flights. If you're traveling with valuables, jewelry, electronics, or items exceeding this value,