What is ​​Southwest Airlines' Liquid Policy 2025?

Packing liquids for a flight can feel overwhelming if you don’t know the airline’s rules. Many travelers are unsure about which products belong in checked luggage and which must stay out. With Southwest Airlines, the baggage policy is relatively flexible, but it still follows federal safety standards that every passenger must respect.

You’re free to carry full-size toiletries and most personal liquids in your checked bag, yet some items like flammable or chemical-based liquids remain strictly off-limits. This guide from Travelpodium simplifies the process by explaining what’s permitted, what isn’t, and how to pack efficiently so your trip stays stress-free from start to finish.

Southwest’s Checked Baggage Policy

Before deciding what to pack, it helps to understand how Southwest’s checked baggage system works. The airline is known for its traveler-friendly approach and is among the few in the U.S. that allows passengers to check two bags at no extra charge.

Each bag can weigh up to 50 pounds (23 kg) and measure a combined 62 inches (length + width + height). However, Southwest must still follow TSA (Transportation Security Administration) safety regulations that ban hazardous materials from aircraft. While most liquids are accepted in checked baggage, those that are corrosive or highly flammable are prohibited.

Essential things to remember:

• You get two free checked bags with every Southwest ticket.
• Bags heavier than 50 lbs or larger than 62 inches may result in excess baggage fees.
• TSA may inspect your suitcase if leakage or a restricted substance is suspected.
• Only non-hazardous liquids are approved for transport.

Knowing these details early helps you avoid extra costs and last-minute repacking at the airport.

Also Read: Does Southwest Have Tvs

Liquids You Can Pack in Checked Baggage

One major advantage when flying with Southwest is that the liquid limitations for checked luggage are much more relaxed compared to carry-on bags. You can pack full-size bottles and larger containers, provided they are sealed securely and meet safety rules.

Approved liquids include:

• Toiletries: Items like shampoo, body wash, conditioner, sunscreen, and toothpaste are perfectly fine to pack.
• Non-flammable products: Mouthwash, lotion, and similar liquids without alcohol or pressurised gas can go in your suitcase.
• Liquid medication: You can keep prescribed medicines in checked luggage, though critical or temperature-sensitive drugs are best kept in your carry-on.
• Baby supplies: Baby formula, lotion, and oil are allowed if packed properly in leak-proof bags.

Even if these items are approved, always seal the caps firmly and wrap them in protective layers. A leaking bottle can damage clothes or trigger security checks during screening.

Liquids You Cannot Pack in Southwest Checked Baggage

While Southwest provides flexibility, it enforces strict bans on any liquid that poses a safety hazard, chemical reaction, or fire risk. These items are not allowed under any circumstances.

Restricted liquids include:

• Cleaning chemicals: Products such as bleach, liquid detergents, or industrial cleaners are completely banned.
• Flammable substances: Paint, kerosene, lighter fuel, or any combustible solvent must not be checked in.
• Pressurised aerosols: Spray cans containing flammable gases like deodorant sprays, paint sprays, or insect repellents are restricted.
• Corrosive materials: Acids, peroxides, or strong chemical solutions that may cause burns or damage aircraft equipment.

If airport security or TSA finds any of these items, they will be confiscated immediately, and your bag could be delayed or denied boarding. Always double-check the label before packing to avoid violations.

How to Pack Liquids Safely in Checked Bags

Even permitted liquids can create problems if they leak or break open during transit. To keep your items safe and prevent messes, pack your liquids carefully using a few simple methods.

Smart packing steps:

• Use leak-proof plastic bags: Store all bottles and tubes inside resealable pouches to contain spills.
• Tighten and seal caps: Wrap tape or plastic wrap around lids to avoid accidental openings.
• Keep liquids in the middle of your suitcase: Surround them with soft clothes or towels to cushion against movement.
• Don’t overfill containers: Leave a bit of space to account for air pressure changes at high altitude.
• Choose lightweight packaging: Travel-size or plastic containers reduce weight and risk of breakage.

These quick precautions ensure your baggage stays clean and your liquids arrive safely at your destination.

Flying with Liquids: Checked vs Carry-On

Many travelers find it tricky to decide whether certain liquids should go into a checked suitcase or their cabin bag. The right choice depends on the type of liquid and how essential it is during travel.

Here’s a clear comparison to help you pack smartly:

• Carry-on liquids: The TSA’s 3-1-1 rule applies to hand luggage. This means each liquid container must be under 3.4 ounces (100 ml) and all must fit inside one clear, quart-sized plastic bag. This rule mainly affects gels, sprays, and creams.
• Checked liquids: You can carry full-sized bottles like shampoo, lotion, and mouthwash in your checked baggage. There’s no size restriction, but the items must not be flammable or corrosive.
• Essential items: Always carry life-saving medications, medical solutions, or valuables in your handbag for immediate access.
• Connecting flights: If you have transfers or connecting routes, especially through international airports, note that each airline may have different liquid restrictions.

By sorting your liquids before reaching the airport, you’ll move through security faster and prevent potential baggage inspection delays.

Essential Tips Before Flying with Southwest

Packing liquids safely isn’t just about following the rules; it’s also about being smart and prepared. The way you organise your liquids can save you time, reduce stress, and protect your belongings.

Practical travel tips:

• Inspect your carry-on first: Take out IDs, critical medications, and fragile items before checking your bag.
• Label every container: If you’re bringing refilled or homemade liquids, label them clearly so TSA officers can identify their contents quickly.
• Start early: Last-minute packing often leads to mistakes. Give yourself time to sort permitted and restricted liquids.
• Use protective layers: Place fragile or spill-prone bottles inside waterproof pouches or between clothing layers for added safety.
• Check Southwest’s latest rules: The airline occasionally updates baggage policies, so reviewing their website before your flight is a smart move.

A few extra minutes of preparation can save you from unnecessary damage, stress, or inspection delays at the airport.

Booking Flights and Packing Smart with Travelpodium

Flying doesn’t have to be stressful when you plan with Travelpodium. Along with competitive airfares, you’ll get up-to-date travel resources, including baggage rules, packing tips, and flight updates, all in one place.

Why travelers trust Travelpodium?

• Compare the best airfares: Access real-time fares from Southwest Airlines and other leading carriers.
• Know before you fly: Get detailed information on baggage policies, allowances, and restricted items before checkout.
• Stay updated: Receive instant alerts about flight changes, cancellations, or security policies straight to your inbox.
• Enjoy a simple booking process: Secure your flight in just a few steps with complete transparency and no hidden fees.

With Travelpodium, you can pack confidently, travel smarter, and enjoy a smoother flying experience from booking to boarding.

Conclusion

Southwest Airlines’ checked baggage liquid rules can make your travel experience far more relaxed. You can bring full-size toiletries and other non-flammable liquids in your checked luggage, but avoid packing anything corrosive, highly flammable, or chemically reactive. Always ensure bottles are tightly sealed, clearly labeled, and cushioned properly.

If you’re ready to plan your next getaway, book your Southwest Airlines tickets with Travelpodium. You’ll get transparent fare options, updated baggage guidelines, and a smooth booking experience that makes traveling simple, secure, and stress-free.