Planning a trip with Southwest Airlines in 2026? One of the most common questions travelers ask is whether carry-on bags are still allowed—and if so, what the updated size limits and rules look like. With airlines increasingly tightening baggage policies, it’s smart to double-check before heading to the airport. Here’s everything you need to know about Southwest Airlines’ carry-on rules this year, explained in simple and practical terms.
TLDR: Yes, Southwest Airlines still allows carry-on bags in 2026. Passengers can bring one carry-on bag and one personal item free of charge, as long as they meet the size limits. The maximum carry-on dimensions are 24 x 16 x 10 inches, including handles and wheels. Personal items must fit under the seat in front of you.
Southwest’s 2026 Carry-On Policy at a Glance
Southwest Airlines has long marketed itself as a traveler-friendly airline, especially when it comes to baggage. In 2026, that customer-first philosophy remains intact.
Here’s what you’re allowed to bring onboard:
- One carry-on bag (placed in the overhead bin)
- One personal item (placed under the seat in front of you)
The best part? Both items are still included in your ticket price. Unlike many other U.S. airlines, Southwest has not introduced basic economy fares that eliminate carry-on privileges.
Carry-On Size Limits for 2026
Size matters when it comes to carry-on bags. Southwest enforces dimension limits to ensure bags fit safely in overhead compartments.
Maximum carry-on size:
- 24 inches long
- 16 inches wide
- 10 inches high
Important: These measurements include wheels, handles, and any protruding parts.
If your bag exceeds these dimensions, you may be required to check it at the gate.
Weight Limits
Unlike some international airlines, Southwest does not impose a specific weight limit on carry-on luggage. However, you must be able to lift your bag into the overhead bin without assistance. If you struggle to do so, a flight attendant may require the bag to be checked.
What Counts as a Personal Item?
Your personal item is meant to fit completely under the seat in front of you. Acceptable examples include:
- Purses
- Briefcases
- Small backpacks
- Laptop bags
- Tote bags
While Southwest does not publish exact personal item dimensions, a good rule of thumb is to keep it under 18.5 x 8.5 x 13.5 inches. These dimensions generally ensure the item fits comfortably beneath the seat.
If your “personal item” is too large, it may be counted as your main carry-on—or checked if it exceeds limits.
Are There Any Exceptions?
Yes. Southwest makes reasonable accommodations for special items. These do not count toward your carry-on limit:
- Assistive devices (wheelchairs, crutches, CPAP machines)
- Outer garments (coats, hats)
- Food for in-flight consumption
- Child restraint systems
- Strollers and car seats (subject to aircraft space)
Medical and mobility devices receive top priority and are accepted without additional fees.
How Southwest Compares to Other Airlines in 2026
Many airlines have changed their baggage policies in recent years, especially for lower-priced fares. Here’s how Southwest stacks up:
| Airline | Carry-On Included? | Max Size (inches) | Weight Limit |
|---|---|---|---|
| Southwest | Yes (1 free) | 24 x 16 x 10 | No official limit |
| American Airlines | Yes (basic included) | 22 x 14 x 9 | No official limit |
| Delta Air Lines | Yes | 22 x 14 x 9 | No official limit |
| United Airlines | Limited on basic fares | 22 x 14 x 9 | No official limit |
As you can see, Southwest actually allows slightly larger carry-on dimensions than many competitors. That extra space can make a big difference for travelers packing bulkier items.
Gate Checking: What You Should Know
If an overhead bin fills up—especially on busy flights—Southwest may ask for volunteers to gate-check bags at no charge. This commonly happens on full flights.
Gate-checked bags:
- Are tagged at the departure gate
- Travel in the cargo hold
- Are returned at baggage claim
While it’s free, remember that placing valuables (laptops, medication, travel documents) in your carry-on can become inconvenient if your bag must be checked unexpectedly. Keep essentials in your personal item when possible.
Tips to Avoid Carry-On Problems
Even though Southwest remains more flexible than most airlines, enforcement has become slightly stricter in recent years due to fuller flights.
Here’s how to avoid issues:
1. Measure Your Bag Before You Leave
Include wheels and handles in your measurements. Hard-shell luggage tends to exceed limits more often than soft-sided bags.
2. Use Compression Packing Cubes
These maximize space and help ensure your suitcase closes fully within dimension limits.
3. Board Early
Southwest uses an open seating policy. Boarding position also influences overhead bin availability. Earlier boarding increases your chance of keeping your bag with you.
4. Keep Essentials in Your Personal Item
Always store:
- Medication
- Electronics
- Chargers
- Travel documents
- Valuables
This protects you in case your bag must be gate-checked.
Special Items: What About Musical Instruments and Sports Gear?
Southwest allows small musical instruments as carry-on items if they fit within size limits. For example:
- Violins
- Small guitars
- Trumpets
If the instrument exceeds dimensions but you want it in the cabin, you may purchase an additional seat.
For sports equipment such as:
- Golf clubs
- Skis
- Snowboards
These must generally be checked, even if they technically fit within total dimensions, due to shape or safety concerns.
Carry-On Liquids and TSA Rules
Remember that carry-on rules also intersect with TSA security requirements. In 2026, the standard 3-1-1 liquid rule still applies for most U.S. airports:
- Liquids must be in containers of 3.4 ounces (100 ml) or less
- All containers must fit in one quart-sized clear plastic bag
- One bag per passenger
Some airports are gradually implementing advanced CT scanners that allow larger liquid quantities, but unless explicitly stated, assume the traditional rule applies.
Image not found in postmetaFamily Travel and Carry-On Flexibility
Traveling with children? Southwest remains family-friendly in 2026. In addition to your carry-on allowance, parents can bring:
- Diaper bags (reasonable size)
- Breast pumps
- Child safety seats
- Strollers (gate-checked)
Families with children aged 6 and under qualify for family boarding between Groups A and B, improving overhead bin access.
Has Anything Changed in 2026?
While Southwest’s core carry-on policy remains stable, there are a few subtle updates:
- More consistent enforcement of size limits at busy airports
- Increased use of bag sizers at boarding gates
- Stronger encouragement for voluntary gate-checking on full flights
However, the biggest relief for travelers is that carry-on bags are still free across all fare types.
Final Thoughts: Is Southwest Still Carry-On Friendly?
Absolutely. In an era where airlines continue tightening restrictions and adding fees, Southwest Airlines remains one of the more generous carriers for cabin baggage. The 24 x 16 x 10-inch allowance provides more flexibility than many competitors, and the inclusion of a free personal item ensures most travelers can pack for short trips without checking a bag.
The key to a stress-free experience in 2026 is simple: measure your bag, board early if possible, and always keep essentials in your personal item. Follow those basic guidelines, and you’ll likely breeze through boarding without any baggage headaches.
For travelers who prefer avoiding checked bag delays—or simply want everything within arm’s reach—Southwest Airlines continues to be a solid and dependable choice.
