Can You Check In A Box On Southwest? | Your Moving Guide

You might assume a cardboard moving box belongs with a shipping company, not at an airline check-in counter. After all, boxes look different from suitcases and duffel bags. Southwest Airlines actually treats them the same way.

The short answer is yes — you can check a box on Southwest Airlines as part of your two free checked bags. Your box just needs to stay within the standard size and weight limits that apply to any checked item. No special permission or extra paperwork is required.

Size, Weight, And The Two-Free-Bag Rule

Southwest’s checked baggage policy applies equally to boxes and suitcases. The standard size limit is 62 linear inches, calculated by adding the length, width, and height of your box together. That’s roughly a box that’s 24 inches on each side.

The weight limit is 50 pounds per box. Your bathroom scale is fine for weighing at home before you leave. A box that’s under 50 pounds and under 62 linear inches checks in for free as one of your two allowed bags.

Checking a box on Southwest counts toward the same two-free-bag allowance that comes with every ticket. You can bring two boxes, two suitcases, or one of each and still pay nothing for checked luggage. NerdWallet’s guide confirms the airline accepts moving boxes as standard checked items.

Why Checking A Box Saves Time And Money

Most travelers assume shipping a box through UPS or FedEx is the only option. That assumption costs both money and convenience. Southwest’s two-free-bags policy means most boxes travel for nothing extra — a clear advantage over paying $20 to $50 for ground shipping.

• Cost per box within limits: $0. Southwest charges nothing for boxes that stay under 50 pounds and 62 linear inches.
• Shipping company cost: $20 to $50 for a 40-pound box depending on distance. That adds up fast when moving across the country.
• Time savings: Your box flies with you and arrives at baggage claim. No tracking numbers or pickup windows needed.
• Two-box capacity per ticket: You can check two boxes free as long as both meet size and weight limits. Perfect for moving or shipping holiday gifts.
• No special packaging required: A sturdy cardboard box with proper tape works the same as a hard-sided suitcase at the counter.

The math is simple for anyone moving between cities or shipping large items. Two free boxes per ticket can replace a separate shipping trip entirely and arrive at the same time you do.

When Your Box Exceeds The Limits — Fee Breakdown

Boxes that push past 50 pounds or 62 linear inches trigger specific fees. Southwest publishes clear charges for oversized and overweight items, so there are no surprises at the counter. Understanding these limits before you pack helps you decide whether to trim your load.

The combined category offers a notable exception. Boxes that exceed both size and weight limits qualify for a single $75 fee instead of two separate penalties. Flyertalk’s community discussion points to this as the combined oversized overweight fee, applying to items up to 100 pounds.

The Hard Limits To Know

Southwest sets absolute maximums for any checked item. Boxes cannot exceed 100 pounds or 80 linear inches — the airline will refuse boxes beyond those thresholds entirely. That means your biggest moving boxes likely need to stay under roughly 24 by 24 by 30 inches to pass.

Planning ahead saves money. A box that’s 55 pounds costs $100 extra. Removing five pounds worth of items keeps your charge at $0 and protects your belongings from rough handling at weight extremes.

How To Pack And Label Your Box For Travel

Packing a box for air travel requires a bit more care than packing one for ground shipping. Boxes travel through conveyor belts and cargo holds, so reinforcement matters. A few simple preparation steps can prevent a burst box in the baggage system.

1. Reinforce the bottom and seams with extra tape. The stress of stacking and conveyor belts puts pressure on the weakest points. A strip across each seam adds enough strength for a typical flight.
2. Label all sides with your name, address, and flight information. Clear labeling helps Southwest identify your box if it gets separated from your itinerary. Include a phone number and destination hotel if applicable.
3. Use bubble wrap or packing peanuts for fragile items. Boxes get tossed and stacked during handling. Wrapping each fragile item individually and filling empty space prevents shifting and breakage.
4. Do not seal closed any items the TSA may need to inspect. Checked boxes are subject to physical screening. Electronics wrapped in bubble wrap should remain accessible so inspectors can remove them without tearing everything apart.

Packing efficiently also helps you stay under the 50-pound limit. Use a luggage scale to weigh your box before heading to the airport. That five-minute check can save you $100 in overweight fees.

Digital Check-In, TSA Screening, And Embargoes

The logistics of checking a box start before you reach the airport. Southwest allows you to process your box through digital check-in starting 24 hours before your flight — see the official baggage policy page for step-by-step instructions on adding your box as a checked item.

TSA screens every checked box just like a regular suitcase. That means anything that looks suspicious on the X-ray machine triggers a physical inspection. Packing items in easy-to-open layers and avoiding unnecessary locks or tapes over access points makes the screening go smoothly.

When Embargoes Apply

Southwest occasionally enforces temporary baggage embargoes during peak travel periods or at specific airports. During an embargo, the airline does not accept boxes of any size as checked baggage. The exception covers televisions and air conditioning units still in their original manufacturer packaging.

International flights also carry different rules. Southwest’s baggage policy varies by destination country, and customs regulations may require specific labeling or restrict certain items from crossing borders. Check the destination country’s restrictions well before your travel date.

The Bottom Line

Checking a box on Southwest Airlines is straightforward and often free. Stick to the 62 linear inch and 50 pound limits, reinforce your box with tape, and label it clearly with your contact information. Two boxes fit within the standard free baggage allowance, making Southwest a cost-effective option for moving items or shipping holiday gifts.

If you’re moving between cities or shipping large items, check Southwest’s current baggage embargo schedule for your specific travel dates before you pack — temporary restrictions at certain airports can change the rules for box acceptance during peak periods.