What Can I Not Bring on Southwest Airlines? | Complete Guide for Travelers

Traveling by air requires knowledge of what you can—and especially what you cannot—bring aboard your flight. Southwest Airlines, known for its customer-friendly policies, generous baggage allowances, and free checked bags, still maintains strict regulations on prohibited items to ensure the safety and comfort of passengers and crew. Whether you’re a frequent flyer or preparing for your first trip with Southwest, understanding these restrictions helps you avoid delays, confiscations, or unexpected surprises at the airport.

This in-depth guide details everything you need to know about items banned on Southwest Airlines, covering carry-on and checked baggage, from hazardous materials to everyday products that may surprise you. We’ll break down TSA rules, Southwest-specific restrictions, and tips to help you pack smarter and travel smoother.

Understanding Southwest Airlines’ Baggage Policy Framework

Before diving into what you can’t bring, it’s important to understand the context of Southwest’s baggage rules. The airline makes it easy for most travelers by offering two free checked bags (up to 50 lbs each and 62 linear inches), free carry-on bag, and one personal item—all included in the ticket price.

However, these perks don’t override federal safety regulations enforced by the Transportation Security Administration (TSA), which govern most restrictions. Southwest doesn’t create these rules, but it enforces them to maintain consistency with U.S. air travel standards.

Key Authorities Behind Prohibited Items

• Transportation Security Administration (TSA): Sets national security standards applying to all U.S. airlines
• Federal Aviation Administration (FAA): Regulates hazardous materials and in-flight safety
• Southwest Airlines Security Team: Interprets and enforces policies based on TSA/FAA guidelines

Any item that poses a safety risk, causes discomfort, or could be used as a weapon may be banned. Some restrictions apply to both carry-ons and checked bags, while others vary depending on where you pack the item.

Prohibited Carry-On Items: What to Leave at Home

Southwest allows one carry-on bag and one personal item per passenger. While carry-ons offer convenience, TSA rules are strict about what can accompany you into the cabin.

Weapons and Self-Defense Items

These are non-negotiable. Any item that can be used as a weapon is strictly prohibited in carry-on luggage.

Examples include:

• Guns, firearms, and replica weapons (including Airsoft and BB guns)
• Firearms or tools with sharp blades longer than 2.36 inches (approximately 6 cm)
• Box cutters, utility knives, and box-opening blades
• Baseball bats, golf clubs, and hockey sticks (even as sports equipment)
• Pepper spray, mace, and stun guns
• Tasers (though allowed in checked baggage—see below)

Note: Even if you have a concealed carry permit, firearms are not allowed in carry-ons on Southwest Airlines. They must be declared, securely stored, and packed in a hard-sided, locked container in checked baggage.

Liquids, Gels, and Aerosols: The 3-1-1 Rule

The famous “3-1-1” rule affects how liquids are packed in carry-ons:

• Liquid, gel, or aerosol containers must be 3.4 ounces (100 milliliters) or smaller
• All containers must fit into one quart-sized, clear, resealable plastic bag
• Each passenger is allowed one plastic bag

Items impacted by the 3-1-1 rule:

Larger liquid items can be packed in checked luggage.

Flammable and Hazardous Materials

These items are banned due to risk of fire or explosion. Never pack them in carry-ons.

• Lighter fluid and butane refills
• Propane tanks, camping fuel, and kerosene
• Strike-anywhere matches or large quantities of matches
• Fireworks, flares, or explosive devices
• Aerosol cans containing flammable ingredients (e.g., certain spray paints, aerosol lubricants)

Note: One small book of safety matches or one standard lighter (non-torch) is allowed in carry-on, but not in checked bags.

Tools and Sharp Objects

While some small tools are permitted in checked baggage, they’re banned from carry-ons due to security risks.

• Screwdrivers, hammers, or wrenches larger than 7 inches
• Multi-tools with blades longer than 2.36 inches
• Power drills, saws, or soldering irons
• Scissors with blades exceeding 4 inches (tip-to-tip when open)

Small scissors with blades shorter than 4 inches, nail clippers, and tweezers are generally permitted.

Electronic Devices with Lithium Batteries

While most electronics are allowed, how and where you store them matters.

Banned or Restricted Electronics:

• Smart luggage with non-removable lithium batteries: Southwest prohibits smart bags unless the battery is removable and carried in the cabin
• Hoverboards and self-balancing scooters (e.g., Segways): Banned entirely due to past fire incidents from lithium-ion batteries
• Electronic cigarettes (e-cigarettes) and vape pens: Allowed in carry-ons but not in checked bags

Always carry spare lithium batteries in your carry-on. Never pack loose batteries in checked luggage.

What You Cannot Pack in Checked Bags

Many travelers assume checked bags are less restricted, but certain items are banned here too. Some are banned for safety, others for reliability or value.

Hazardous Chemicals and Flammable Substances

These pose risks during flight, especially in cargo holds where temperature and pressure fluctuate.

• Acids, corrosives, bleach, or pool chemicals
• Gasoline, diesel, and other fuels
• Pesticides, insecticides, or compressed gas cylinders (except small life jacket CO₂ cartridges)
• Dry ice in sealed containers exceeding 5.5 lbs (unless approved for medical/therapeutic use with advance notice)

Firearms and Weapons (Special Rules Apply)

Firearms are allowed in checked luggage—but only under strict regulations.

To transport a firearm on Southwest:

1. Must be unloaded and securely stored in a hard-sided, lockable container
2. Cannot be accessible during flight (no soft cases or unlocked bags)
3. Must be declared at check-in and presented to a Southwest agent
4. Ammunition must be packed in original packaging or UN-approved containers, not exceeding 11 lbs total
5. Only passengers 18+ may transport firearms

Failure to comply may result in fines, denial of boarding, or legal action.

TSA-Approved Locks vs. Prohibited Locks

Southwest suggests using TSA-approved locks for checked baggage. These allow security agents to open and inspect luggage without damaging it.

Using non-TSA locks isn’t banned, but if agents need to inspect your bag and can’t open it, they may cut the lock. Avoid locking bags tightly with non-approved locks.

Perishable and Odorous Items

While not explicitly “banned,” items that spoil, leak, or smell strongly may be refused as checked baggage.

• Fresh seafood or raw meat (without refrigeration)
• Cheeses with strong odors (e.g., Limburger, blue cheese in large quantities)
• Open packages of food or liquids

If packing food, ensure it’s sealed, refrigerated (if needed), and won’t spill during transit.

Southwest Airlines’ Unique Prohibited Items and Policies

Beyond federal regulations, Southwest has airline-specific rules that reflect its customer experience and operational practices.

Animals (Other Than Service Animals)

Southwest does not allow pets in the cabin except for service animals and emotional support animals (with limitations).

• Pets (dogs, cats, birds, etc.) cannot fly in cabin on Southwest flights (unlike other airlines that allow small pets)
• Service animals: Must be trained, non-aggressive, and travel free of charge (documentation may be requested)
• Emotional support animals: No longer accepted as of December 2020, per TSA/FAA updates

Special arrangements must be made in advance for service animals, including completion of Southwest’s service animal form.

Restricted Sports and Recreational Equipment

Some sports gear is allowed, but certain items are banned.

Permitted (with conditions):

• Soccer balls, basketballs (deflated and packed)
• Tennis rackets, golf clubs (packed carefully in bags)
• Skateboards (as personal item or checked bag)

Prohibited:

• Fireworks used in sports events
• CO₂ cartridges for paintball guns (unless 16g or smaller)
• Skis and snowboards: Allowed, but count as one checked bag and must be packed in a ski bag

Bulk Liquids and Alcohol

Alcohol is permitted on Southwest flights, but duty-free purchases may be restricted depending on origin.

• Alcohol under 140 proof (70% alcohol by volume) is allowed in checked bags (quantity limited)
• Open bottles of alcohol are not permitted
• Purchases made post-security (e.g., airport duty-free) are allowed, but must be sealed in a tamper-evident bag

If traveling internationally, check the destination country’s import rules for alcohol.

Medical and Personal Care Exceptions

Certain medical devices and medications are handled with flexibility.

Medications

• All prescription and over-the-counter medications are allowed in both carry-ons and checked bags
• Liquids exceeding 3.4 oz (e.g., cough syrup) are permitted in carry-ons but must be declared at screening
• Keep medications in original containers when possible

TSA allows medically necessary liquids, but screening may require additional inspection. Notify an agent if you have such items.

Medical Devices

• Insulin, inhalers, EpiPens: Permitted in carry-ons
• Portable oxygen concentrators (POCs): Only FAA-approved models allowed; must meet Southwest’s POC policy
• CPAP machines: Allowed as carry-on, do not count against personal item limit

Sharp Medical Items

• Diabetic needles and syringes: Allowed with proper documentation and medication
• Never pack needles in checked baggage due to potential hazard if container breaks

Always carry a doctor’s note for high-risk items.

Everyday Items That Surprise Travelers

Many common household items are restricted—often catching travelers off guard.

Knives and Kitchen Tools

• Butter knives and steak knives: Prohibited in carry-ons (allowed in checked luggage)
• Cooking shears: Banned from carry-ons if blades exceed 4 inches
• Box cutters: Never allowed in carry-on

Toys and Replicas

• Toy guns that resemble real firearms: Prohibited in carry-ons
• BB guns and Airsoft guns: Must be packed in checked luggage
• Pop-up tents or inflatable furniture: Permitted but may require gate-checking if oversized

Candles and Incense

• Flammable candles and incense: Banned from carry-ons
• Non-flammable decorative candles: Allowed if securely packed in checked bags

Tips to Avoid Baggage Issues When Flying Southwest

Avoid frustration by preparing ahead. Here are key strategies:

1. Pack Smart and Double-Check Restrictions

Use the TSA’s “What Can I Bring?” tool and Southwest’s baggage portal to verify items before packing. When in doubt, leave it out or pack it in checked luggage.

2. Label and Secure Checked Bags

Use durable luggage tags with contact information. Southwest recommends using their baggage tags, available at check-in or online, to help locate lost items.

3. Declare Restricted Items

If you’re bringing firearms, hazardous materials for medical use, or oversized equipment, contact Southwest Customer Service at least 48 hours before departure to confirm requirements.

4. Use TSA-Approved Locks and Packaging

Protect belongings while allowing security access. Avoid zip ties or permanent seals.

5. Limit Liquids and Separate Valuables

Carry electronics, jewelry, cash, and medications in your carry-on. Don’t risk damage or loss in checked baggage.

What Happens If You Bring a Prohibited Item?

Consequences vary based on the item and intent.

• Mistakenly packing a small prohibited item (e.g., a pocket knife) may result in it being confiscated at screening
• Intentional attempts to bring weapons or explosives can lead to fines, arrest, or being placed on a no-fly list
• Items left behind at checkpoints are typically destroyed or discarded

Southwest encourages honesty and compliance. If you’re unsure about an item, ask a TSA agent or Southwest representative before proceeding.

Summary: What Can I Not Bring on Southwest Airlines?

Here’s a quick recap of the most common prohibited items:

Final Thoughts: Fly Confidently with Southwest Airlines

Knowing what you cannot bring on Southwest Airlines isn’t about fear—it’s about preparedness. Whether you’re flying for business, vacation, or a special event, a smooth travel experience starts with smart packing and awareness.

Southwest’s free baggage policy might make packing easier, but it doesn’t exempt you from federal and airline regulations. Review restrictions ahead of time, double-check your bags, and communicate with agents when needed.

By following these guidelines, you’ll avoid delays, protect your belongings, and contribute to a safer, stress-free flight for everyone. With a little planning, your Southwest journey can be as worry-free as it is affordable.

What types of liquids are not allowed on Southwest Airlines?

Southwest Airlines follows the Transportation Security Administration (TSA) guidelines for liquids in carry-on baggage. Any liquid, gel, or aerosol must be in containers of 3.4 ounces (100 milliliters) or less and must fit within a single, clear, quart-sized bag. This includes items such as shampoo, lotions, toothpaste, and liquid makeup. Larger quantities of liquids are not permitted in carry-ons unless they are medically necessary or part of a child’s needs (e.g., baby formula or breast milk), which can be declared at security screening.

Exceptions to the liquids rule exist for duty-free items purchased at airport security checkpoints or international airports, which may come in larger containers and are sealed in special bags. However, these must remain sealed, and you may not check such items or carry them through foreign security checkpoints upon return. It’s also important to note that bringing prohibited liquids—such as flammable materials, fuels, or large containers of alcohol—can result in confiscation at security or delays. Passengers should always verify specific restrictions for international flights, as regulations may differ by destination.

Are firearms allowed on Southwest Airlines flights?

Firearms are strictly prohibited in carry-on baggage on Southwest Airlines. Attempting to bring a firearm into the cabin, even by accident, can result in law enforcement involvement, fines, and potential criminal charges. TSA screens all carry-on bags, and if a firearm is detected, the airport authorities will be immediately notified, and the passenger will be denied boarding.

However, Southwest does allow passengers to check firearms in accordance with federal regulations and the airline’s specific policies. The firearm must be unloaded, stored in a hard-sided, locked container, and declared at check-in. Only individuals who are legally permitted to possess firearms may transport them, and ammunition must be packed separately in approved packaging and also within the checked firearm case or in a separate container meeting specific guidelines. Always review Southwest’s latest firearms policy and local laws for your departure and destination before traveling.

Can I bring sharp objects in my carry-on bag on Southwest?

Sharp objects such as knives, box cutters, razor blades, and utility tools are not permitted in carry-on luggage on Southwest Airlines. These items pose a security risk and are prohibited under TSA regulations. Even small pocket knives or Swiss Army knives are not allowed and will be confiscated during security screening. Scissors with blades longer than 4 inches are also banned from carry-ons.

However, these items can be packed in checked luggage if properly secured to prevent injury to baggage handlers. Passengers should store sharp objects in a sheath, case, or wrap them securely to avoid accidental exposure. It’s advisable to pack tools like multitools or kitchen knives in checked bags well in advance and avoid placing them in easily accessible pockets. Always double-check contents before departure to prevent any travel disruptions.

Are aerosol spray cans allowed on Southwest Airlines?

Certain aerosol spray cans are permitted in carry-on bags, but only if they contain non-flammable contents and are 3.4 ounces (100 milliliters) or smaller. Common examples include hairspray, deodorant, and insect repellent that comply with these size restrictions. These must be placed in the quart-sized clear bag along with other liquids and gels. Larger non-flammable aerosols can be packed in checked luggage under certain limits.

Flammable aerosols such as spray paint, propane, lighter fluid, and certain cleaning products are completely prohibited on Southwest Airlines, whether in carry-on or checked baggage. Aerosols labeled as hazardous, especially those in red or yellow flammability categories, pose a fire risk and are not allowed onboard. Always read labels carefully and dispose of any prohibited aerosols before arriving at the airport to avoid confiscation or fines.

Can I bring hoverboards or electronic self-balancing devices on Southwest?

Hoverboards and other self-balancing scooters powered by lithium-ion batteries are not allowed on Southwest Airlines flights, either in carry-on or checked baggage. This restriction stems from safety concerns regarding the potential for lithium batteries to overheat and catch fire, especially when damaged or improperly manufactured. The Federal Aviation Administration (FAA) and airline carriers, including Southwest, have banned these devices due to the risk they pose during flight.

Even hoverboards with UL-certified batteries are not permitted on Southwest flights. The airline enforces a total ban, regardless of battery size or certification. If you’re traveling with mobility devices such as electric scooters that qualify as assistive devices, different rules may apply, and special arrangements can be made. However, standard hoverboards, regardless of brand or quality, are prohibited and should be shipped via ground transportation instead.

Are there restrictions on bringing food on Southwest Airlines?

Southwest Airlines does not restrict bringing most types of food on board in either carry-on or checked baggage. Passengers commonly bring snacks, sandwiches, fruits, and pre-packaged meals without issue. Solid food items pass easily through TSA screening, though messy or liquid-rich foods such as soups, sauces, or yogurt must comply with the 3.4-ounce liquid rule if carried in a carry-on.

However, certain food items may raise concerns during security screening or violate customs regulations on international flights. For example, fresh produce, meats, or dairy products might be restricted when entering different countries. Additionally, strong-smelling foods like durian are generally discouraged, though not explicitly banned by Southwest, due to passenger comfort. To avoid complications, pack food securely and check destination-specific restrictions if traveling internationally.

Can I bring CBD products or medications on Southwest Airlines?

CBD products that contain less than 0.3% THC and are derived from hemp are generally allowed on Southwest Airlines flights, in line with TSA policy. Passengers can bring CBD oils, gummies, and topical products, provided they comply with liquid limits if carried in a carry-on. However, TSA officers do not specifically search for cannabis products, and if a substance appears suspicious or exceeds legal THC limits, it may be referred to law enforcement.

Medications, including prescription and over-the-counter drugs, are permitted in reasonable quantities. Southwest recommends that passengers keep medications in their original containers or a labeled pill organizer to ease the screening process. While there are no limits on medication amounts, TSA may ask for verification if large quantities are detected. Travelers with medical conditions should carry documentation from a physician, especially when transporting injectable medications or medical devices. Always check restrictions for international destinations, where CBD and certain medications may be illegal.